paddleocr

.gitattributes

@@ -32,3 +32,5 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+*.pdiparams filter=lfs diff=lfs merge=lfs -text
+*.pdmodel filter=lfs diff=lfs merge=lfs -text

README.md

@@ -7,6 +7,7 @@ sdk: gradio
 sdk_version: 3.17.0
 app_file: app.py
 pinned: false
+duplicated_from: mertcobanov/deprem-ocr-2
 ---
 
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference

app.py

@@ -1,7 +1,4 @@
 import gradio as gr
-from easyocr import Reader
-from PIL import Image
-import io
 import json
 import csv
 import openai
@@ -9,18 +6,64 @@ import ast
 import os
 from deta import Deta
 
+import numpy as np
+from ocr import utility
+from ocr.detector import TextDetector
+from ocr.recognizer import TextRecognizer
+
+# Global Detector and Recognizer
+args = utility.parse_args()
+text_recognizer = TextRecognizer(args)
+text_detector = TextDetector(args)
+
+openai.api_key = os.getenv("API_KEY")
+
+args = utility.parse_args()
+text_recognizer = TextRecognizer(args)
+text_detector = TextDetector(args)
+
+
+def apply_ocr(img):
+    # Detect text regions
+    dt_boxes, _ = text_detector(img)
+
+    boxes = []
+    for box in dt_boxes:
+        p1, p2, p3, p4 = box
+        x1 = min(p1[0], p2[0], p3[0], p4[0])
+        y1 = min(p1[1], p2[1], p3[1], p4[1])
+        x2 = max(p1[0], p2[0], p3[0], p4[0])
+        y2 = max(p1[1], p2[1], p3[1], p4[1])
+        boxes.append([x1, y1, x2, y2])
+
+    # Recognize text
+    img_list = []
+    for i in range(len(boxes)):
+        x1, y1, x2, y2 = map(int, boxes[i])
+        img_list.append(img.copy()[y1:y2, x1:x2])
+    img_list.reverse()
+
+    rec_res, _ = text_recognizer(img_list)
+
+    # Postprocess
+    total_text = ""
+    for i in range(len(rec_res)):
+        total_text += rec_res[i][0] + " "
+
+    total_text = total_text.strip()
+    return total_text
 
-openai.api_key = os.getenv('API_KEY')
-reader = Reader(["tr"])
 
 def get_parsed_address(input_img):
 
     address_full_text = get_text(input_img)
     return openai_response(address_full_text)
-    
+
 
 def get_text(input_img):
-    result = reader.readtext(input_img, detail=0)
+    input_img = np.array(input_img)
+    result = apply_ocr(input_img)
+    print(result)
     return " ".join(result)
 
 
@@ -38,9 +81,10 @@ def get_json(mahalle, il, sokak, apartman):
     dump = json.dumps(adres, indent=4, ensure_ascii=False)
     return dump
 
+
 def write_db(data_dict):
     # 2) initialize with a project key
-    deta_key = os.getenv('DETA_KEY')
+    deta_key = os.getenv("DETA_KEY")
     deta = Deta(deta_key)
 
     # 3) create and use as many DBs as you want!
@@ -53,16 +97,17 @@ def text_dict(input):
     write_db(eval_result)
 
     return (
-        str(eval_result['city']),
-        str(eval_result['distinct']),
-        str(eval_result['neighbourhood']),
-        str(eval_result['street']),
-        str(eval_result['address']),
-        str(eval_result['tel']),
-        str(eval_result['name_surname']),
-        str(eval_result['no']),
+        str(eval_result["city"]),
+        str(eval_result["distinct"]),
+        str(eval_result["neighbourhood"]),
+        str(eval_result["street"]),
+        str(eval_result["address"]),
+        str(eval_result["tel"]),
+        str(eval_result["name_surname"]),
+        str(eval_result["no"]),
     )
-        
+
+
 def openai_response(ocr_input):
     prompt = f"""Tabular Data Extraction You are a highly intelligent and accurate tabular data extractor from 
             plain text input and especially from emergency text that carries address information, your inputs can be text 
@@ -91,28 +136,31 @@ def openai_response(ocr_input):
     resp = eval(resp.replace("'{", "{").replace("}'", "}"))
     resp["input"] = ocr_input
     dict_keys = [
-    'city',
-    'distinct',
-    'neighbourhood',
-    'street',
-    'no',
-    'tel',
-    'name_surname',
-    'address',
-    'input',
+        "city",
+        "distinct",
+        "neighbourhood",
+        "street",
+        "no",
+        "tel",
+        "name_surname",
+        "address",
+        "input",
     ]
     for key in dict_keys:
         if key not in resp.keys():
-            resp[key] = ''
+            resp[key] = ""
     return resp
 
 
 with gr.Blocks() as demo:
     gr.Markdown(
-    """
+        """
     # Enkaz Bildirme Uygulaması
-    """)
-    gr.Markdown("Bu uygulamada ekran görüntüsü sürükleyip bırakarak AFAD'a enkaz bildirimi yapabilirsiniz. Mesajı metin olarak da girebilirsiniz, tam adresi ayrıştırıp döndürür. API olarak kullanmak isterseniz sayfanın en altında use via api'ya tıklayın.")
+    """
+    )
+    gr.Markdown(
+        "Bu uygulamada ekran görüntüsü sürükleyip bırakarak AFAD'a enkaz bildirimi yapabilirsiniz. Mesajı metin olarak da girebilirsiniz, tam adresi ayrıştırıp döndürür. API olarak kullanmak isterseniz sayfanın en altında use via api'ya tıklayın."
+    )
     with gr.Row():
         img_area = gr.Image(label="Ekran Görüntüsü yükleyin 👇")
         ocr_result = gr.Textbox(label="Metin yükleyin 👇 ")
@@ -133,13 +181,23 @@ with gr.Blocks() as demo:
         with gr.Row():
             no = gr.Textbox(label="Kapı No")
 
+    submit_button.click(
+        get_parsed_address,
+        inputs=img_area,
+        outputs=open_api_text,
+        api_name="upload_image",
+    )
 
-    submit_button.click(get_parsed_address, inputs = img_area, outputs = open_api_text, api_name="upload_image")
-
-    ocr_result.change(openai_response, ocr_result, open_api_text, api_name="upload-text")
+    ocr_result.change(
+        openai_response, ocr_result, open_api_text, api_name="upload-text"
+    )
 
-    open_api_text.change(text_dict, open_api_text, [city, distinct, neighbourhood, street, address, tel, name_surname, no])
+    open_api_text.change(
+        text_dict,
+        open_api_text,
+        [city, distinct, neighbourhood, street, address, tel, name_surname, no],
+    )
 
 
 if __name__ == "__main__":
-    demo.launch()
+    demo.launch()

ocr/.gitignore

@@ -0,0 +1,129 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/

ocr/README.md

@@ -0,0 +1 @@
+# deprem-ocr

ocr/ch_PP-OCRv3_det_infer/inference.pdiparams

@@ -0,0 +1,3 @@
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+size 2377917

ocr/ch_PP-OCRv3_det_infer/inference.pdmodel

@@ -0,0 +1,3 @@
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+oid sha256:74b075e6cfbc8206dab2eee86a6a8bd015a7be612b2bf6d1a1ef878d31df84f7
+size 1413260

ocr/ch_PP-OCRv3_rec_infer/inference.pdiparams

@@ -0,0 +1,3 @@
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+oid sha256:d99d4279f7c64471b8f0be426ee09a46c0f1ecb344406bf0bb9571f670e8d0c7
+size 10614098

ocr/ch_PP-OCRv3_rec_infer/inference.pdmodel

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b9beb0b9520d34bde2a0f92581ed64db7e4d6c76abead8b859189ea72db9ee20
+size 1266415

ocr/detector.py

@@ -0,0 +1,248 @@
+import os
+import sys
+
+__dir__ = os.path.dirname(os.path.abspath(__file__))
+sys.path.append(__dir__)
+sys.path.insert(0, os.path.abspath(os.path.join(__dir__, "../..")))
+
+os.environ["FLAGS_allocator_strategy"] = "auto_growth"
+
+import json
+import sys
+import time
+
+import cv2
+import numpy as np
+
+import utility
+from postprocess import build_post_process
+from ppocr.data import create_operators, transform
+
+
+class TextDetector(object):
+    def __init__(self, args):
+        self.args = args
+        self.det_algorithm = args.det_algorithm
+        self.use_onnx = args.use_onnx
+        pre_process_list = [
+            {
+                "DetResizeForTest": {
+                    "limit_side_len": args.det_limit_side_len,
+                    "limit_type": args.det_limit_type,
+                }
+            },
+            {
+                "NormalizeImage": {
+                    "std": [0.229, 0.224, 0.225],
+                    "mean": [0.485, 0.456, 0.406],
+                    "scale": "1./255.",
+                    "order": "hwc",
+                }
+            },
+            {"ToCHWImage": None},
+            {"KeepKeys": {"keep_keys": ["image", "shape"]}},
+        ]
+        postprocess_params = {}
+        if self.det_algorithm == "DB":
+            postprocess_params["name"] = "DBPostProcess"
+            postprocess_params["thresh"] = args.det_db_thresh
+            postprocess_params["box_thresh"] = args.det_db_box_thresh
+            postprocess_params["max_candidates"] = 1000
+            postprocess_params["unclip_ratio"] = args.det_db_unclip_ratio
+            postprocess_params["use_dilation"] = args.use_dilation
+            postprocess_params["score_mode"] = args.det_db_score_mode
+        elif self.det_algorithm == "EAST":
+            postprocess_params["name"] = "EASTPostProcess"
+            postprocess_params["score_thresh"] = args.det_east_score_thresh
+            postprocess_params["cover_thresh"] = args.det_east_cover_thresh
+            postprocess_params["nms_thresh"] = args.det_east_nms_thresh
+        elif self.det_algorithm == "SAST":
+            pre_process_list[0] = {
+                "DetResizeForTest": {"resize_long": args.det_limit_side_len}
+            }
+            postprocess_params["name"] = "SASTPostProcess"
+            postprocess_params["score_thresh"] = args.det_sast_score_thresh
+            postprocess_params["nms_thresh"] = args.det_sast_nms_thresh
+            self.det_sast_polygon = args.det_sast_polygon
+            if self.det_sast_polygon:
+                postprocess_params["sample_pts_num"] = 6
+                postprocess_params["expand_scale"] = 1.2
+                postprocess_params["shrink_ratio_of_width"] = 0.2
+            else:
+                postprocess_params["sample_pts_num"] = 2
+                postprocess_params["expand_scale"] = 1.0
+                postprocess_params["shrink_ratio_of_width"] = 0.3
+        elif self.det_algorithm == "PSE":
+            postprocess_params["name"] = "PSEPostProcess"
+            postprocess_params["thresh"] = args.det_pse_thresh
+            postprocess_params["box_thresh"] = args.det_pse_box_thresh
+            postprocess_params["min_area"] = args.det_pse_min_area
+            postprocess_params["box_type"] = args.det_pse_box_type
+            postprocess_params["scale"] = args.det_pse_scale
+            self.det_pse_box_type = args.det_pse_box_type
+        elif self.det_algorithm == "FCE":
+            pre_process_list[0] = {"DetResizeForTest": {"rescale_img": [1080, 736]}}
+            postprocess_params["name"] = "FCEPostProcess"
+            postprocess_params["scales"] = args.scales
+            postprocess_params["alpha"] = args.alpha
+            postprocess_params["beta"] = args.beta
+            postprocess_params["fourier_degree"] = args.fourier_degree
+            postprocess_params["box_type"] = args.det_fce_box_type
+
+        self.preprocess_op = create_operators(pre_process_list)
+        self.postprocess_op = build_post_process(postprocess_params)
+        (
+            self.predictor,
+            self.input_tensor,
+            self.output_tensors,
+            self.config,
+        ) = utility.create_predictor(args, "det")
+
+        if self.use_onnx:
+            img_h, img_w = self.input_tensor.shape[2:]
+            if img_h is not None and img_w is not None and img_h > 0 and img_w > 0:
+                pre_process_list[0] = {
+                    "DetResizeForTest": {"image_shape": [img_h, img_w]}
+                }
+        self.preprocess_op = create_operators(pre_process_list)
+
+    def order_points_clockwise(self, pts):
+        rect = np.zeros((4, 2), dtype="float32")
+        s = pts.sum(axis=1)
+        rect[0] = pts[np.argmin(s)]
+        rect[2] = pts[np.argmax(s)]
+        diff = np.diff(pts, axis=1)
+        rect[1] = pts[np.argmin(diff)]
+        rect[3] = pts[np.argmax(diff)]
+        return rect
+
+    def clip_det_res(self, points, img_height, img_width):
+        for pno in range(points.shape[0]):
+            points[pno, 0] = int(min(max(points[pno, 0], 0), img_width - 1))
+            points[pno, 1] = int(min(max(points[pno, 1], 0), img_height - 1))
+        return points
+
+    def filter_tag_det_res(self, dt_boxes, image_shape):
+        img_height, img_width = image_shape[0:2]
+        dt_boxes_new = []
+        for box in dt_boxes:
+            box = self.order_points_clockwise(box)
+            box = self.clip_det_res(box, img_height, img_width)
+            rect_width = int(np.linalg.norm(box[0] - box[1]))
+            rect_height = int(np.linalg.norm(box[0] - box[3]))
+            if rect_width <= 3 or rect_height <= 3:
+                continue
+            dt_boxes_new.append(box)
+        dt_boxes = np.array(dt_boxes_new)
+        return dt_boxes
+
+    def filter_tag_det_res_only_clip(self, dt_boxes, image_shape):
+        img_height, img_width = image_shape[0:2]
+        dt_boxes_new = []
+        for box in dt_boxes:
+            box = self.clip_det_res(box, img_height, img_width)
+            dt_boxes_new.append(box)
+        dt_boxes = np.array(dt_boxes_new)
+        return dt_boxes
+
+    def __call__(self, img):
+        ori_im = img.copy()
+        data = {"image": img}
+
+        st = time.time()
+
+        data = transform(data, self.preprocess_op)
+        img, shape_list = data
+        if img is None:
+            return None, 0
+        img = np.expand_dims(img, axis=0)
+        shape_list = np.expand_dims(shape_list, axis=0)
+        img = img.copy()
+
+        if self.use_onnx:
+            input_dict = {}
+            input_dict[self.input_tensor.name] = img
+            outputs = self.predictor.run(self.output_tensors, input_dict)
+        else:
+            self.input_tensor.copy_from_cpu(img)
+            self.predictor.run()
+            outputs = []
+            for output_tensor in self.output_tensors:
+                output = output_tensor.copy_to_cpu()
+                outputs.append(output)
+
+        preds = {}
+        if self.det_algorithm == "EAST":
+            preds["f_geo"] = outputs[0]
+            preds["f_score"] = outputs[1]
+        elif self.det_algorithm == "SAST":
+            preds["f_border"] = outputs[0]
+            preds["f_score"] = outputs[1]
+            preds["f_tco"] = outputs[2]
+            preds["f_tvo"] = outputs[3]
+        elif self.det_algorithm in ["DB", "PSE"]:
+            preds["maps"] = outputs[0]
+        elif self.det_algorithm == "FCE":
+            for i, output in enumerate(outputs):
+                preds["level_{}".format(i)] = output
+        else:
+            raise NotImplementedError
+
+        # self.predictor.try_shrink_memory()
+        post_result = self.postprocess_op(preds, shape_list)
+        dt_boxes = post_result[0]["points"]
+        if (self.det_algorithm == "SAST" and self.det_sast_polygon) or (
+            self.det_algorithm in ["PSE", "FCE"]
+            and self.postprocess_op.box_type == "poly"
+        ):
+            dt_boxes = self.filter_tag_det_res_only_clip(dt_boxes, ori_im.shape)
+        else:
+            dt_boxes = self.filter_tag_det_res(dt_boxes, ori_im.shape)
+
+        et = time.time()
+        return dt_boxes, et - st
+
+
+if __name__ == "__main__":
+    args = utility.parse_args()
+    image_file_list = ["images/y.png"]
+    text_detector = TextDetector(args)
+    count = 0
+    total_time = 0
+    draw_img_save = "./inference_results"
+
+    if args.warmup:
+        img = np.random.uniform(0, 255, [640, 640, 3]).astype(np.uint8)
+        for i in range(2):
+            res = text_detector(img)
+
+    if not os.path.exists(draw_img_save):
+        os.makedirs(draw_img_save)
+
+    save_results = []
+    for image_file in image_file_list:
+        img = cv2.imread(image_file)
+
+        for _ in range(10):
+            st = time.time()
+            dt_boxes, _ = text_detector(img)
+            elapse = time.time() - st
+            print(elapse * 1000)
+        if count > 0:
+            total_time += elapse
+        count += 1
+        save_pred = (
+            os.path.basename(image_file)
+            + "\t"
+            + str(json.dumps([x.tolist() for x in dt_boxes]))
+            + "\n"
+        )
+        save_results.append(save_pred)
+        src_im = utility.draw_text_det_res(dt_boxes, image_file)
+        img_name_pure = os.path.split(image_file)[-1]
+        img_path = os.path.join(draw_img_save, "det_res_{}".format(img_name_pure))
+        cv2.imwrite(img_path, src_im)
+
+    with open(os.path.join(draw_img_save, "det_results.txt"), "w") as f:
+        f.writelines(save_results)
+        f.close()

ocr/inference.py

@@ -0,0 +1,68 @@
+import os
+
+os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"
+
+import time
+import requests
+from io import BytesIO
+
+import utility
+from detector import *
+from recognizer import *
+
+# Global Detector and Recognizer
+args = utility.parse_args()
+text_recognizer = TextRecognizer(args)
+text_detector = TextDetector(args)
+
+
+def apply_ocr(img):
+    # Detect text regions
+    dt_boxes, _ = text_detector(img)
+
+    boxes = []
+    for box in dt_boxes:
+        p1, p2, p3, p4 = box
+        x1 = min(p1[0], p2[0], p3[0], p4[0])
+        y1 = min(p1[1], p2[1], p3[1], p4[1])
+        x2 = max(p1[0], p2[0], p3[0], p4[0])
+        y2 = max(p1[1], p2[1], p3[1], p4[1])
+        boxes.append([x1, y1, x2, y2])
+
+    # Recognize text
+    img_list = []
+    for i in range(len(boxes)):
+        x1, y1, x2, y2 = map(int, boxes[i])
+        img_list.append(img.copy()[y1:y2, x1:x2])
+    img_list.reverse()
+
+    rec_res, _ = text_recognizer(img_list)
+
+    # Postprocess
+    total_text = ""
+    table = dict()
+    for i in range(len(rec_res)):
+        table[i] = {
+            "text": rec_res[i][0],
+        }
+        total_text += rec_res[i][0] + " "
+
+    total_text = total_text.strip()
+    return total_text
+
+
+def main():
+    image_url = "https://i.ibb.co/kQvHGjj/aewrg.png"
+    response = requests.get(image_url)
+    img = np.array(Image.open(BytesIO(response.content)).convert("RGB"))
+
+    t0 = time.time()
+    epoch = 1
+    for _ in range(epoch):
+        ocr_text = apply_ocr(img)
+    print("Elapsed time:", (time.time() - t0) * 1000 / epoch, "ms")
+    print("Output:", ocr_text)
+
+
+if __name__ == "__main__":
+    main()

ocr/postprocess/__init__.py

@@ -0,0 +1,66 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import copy
+
+__all__ = ["build_post_process"]
+
+from .cls_postprocess import ClsPostProcess
+from .db_postprocess import DBPostProcess, DistillationDBPostProcess
+from .east_postprocess import EASTPostProcess
+from .fce_postprocess import FCEPostProcess
+from .pg_postprocess import PGPostProcess
+from .rec_postprocess import (
+    AttnLabelDecode,
+    CTCLabelDecode,
+    DistillationCTCLabelDecode,
+    NRTRLabelDecode,
+    PRENLabelDecode,
+    SARLabelDecode,
+    SEEDLabelDecode,
+    SRNLabelDecode,
+    TableLabelDecode,
+)
+from .sast_postprocess import SASTPostProcess
+from .vqa_token_re_layoutlm_postprocess import VQAReTokenLayoutLMPostProcess
+from .vqa_token_ser_layoutlm_postprocess import VQASerTokenLayoutLMPostProcess
+
+
+def build_post_process(config, global_config=None):
+    support_dict = [
+        "DBPostProcess",
+        "EASTPostProcess",
+        "SASTPostProcess",
+        "FCEPostProcess",
+        "CTCLabelDecode",
+        "AttnLabelDecode",
+        "ClsPostProcess",
+        "SRNLabelDecode",
+        "PGPostProcess",
+        "DistillationCTCLabelDecode",
+        "TableLabelDecode",
+        "DistillationDBPostProcess",
+        "NRTRLabelDecode",
+        "SARLabelDecode",
+        "SEEDLabelDecode",
+        "VQASerTokenLayoutLMPostProcess",
+        "VQAReTokenLayoutLMPostProcess",
+        "PRENLabelDecode",
+        "DistillationSARLabelDecode",
+    ]
+
+    if config["name"] == "PSEPostProcess":
+        from .pse_postprocess import PSEPostProcess
+
+        support_dict.append("PSEPostProcess")
+
+    config = copy.deepcopy(config)
+    module_name = config.pop("name")
+    if module_name == "None":
+        return
+    if global_config is not None:
+        config.update(global_config)
+    assert module_name in support_dict, Exception(
+        "post process only support {}".format(support_dict)
+    )
+    module_class = eval(module_name)(**config)
+    return module_class

ocr/postprocess/cls_postprocess.py

@@ -0,0 +1,30 @@
+import paddle
+
+
+class ClsPostProcess(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, label_list=None, key=None, **kwargs):
+        super(ClsPostProcess, self).__init__()
+        self.label_list = label_list
+        self.key = key
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        if self.key is not None:
+            preds = preds[self.key]
+
+        label_list = self.label_list
+        if label_list is None:
+            label_list = {idx: idx for idx in range(preds.shape[-1])}
+
+        if isinstance(preds, paddle.Tensor):
+            preds = preds.numpy()
+
+        pred_idxs = preds.argmax(axis=1)
+        decode_out = [
+            (label_list[idx], preds[i, idx]) for i, idx in enumerate(pred_idxs)
+        ]
+        if label is None:
+            return decode_out
+        label = [(label_list[idx], 1.0) for idx in label]
+        return decode_out, label

ocr/postprocess/db_postprocess.py

@@ -0,0 +1,207 @@
+from __future__ import absolute_import, division, print_function
+
+import cv2
+import numpy as np
+import paddle
+import pyclipper
+from shapely.geometry import Polygon
+
+
+class DBPostProcess(object):
+    """
+    The post process for Differentiable Binarization (DB).
+    """
+
+    def __init__(
+        self,
+        thresh=0.3,
+        box_thresh=0.7,
+        max_candidates=1000,
+        unclip_ratio=2.0,
+        use_dilation=False,
+        score_mode="fast",
+        **kwargs
+    ):
+        self.thresh = thresh
+        self.box_thresh = box_thresh
+        self.max_candidates = max_candidates
+        self.unclip_ratio = unclip_ratio
+        self.min_size = 3
+        self.score_mode = score_mode
+        assert score_mode in [
+            "slow",
+            "fast",
+        ], "Score mode must be in [slow, fast] but got: {}".format(score_mode)
+
+        self.dilation_kernel = None if not use_dilation else np.array([[1, 1], [1, 1]])
+
+    def boxes_from_bitmap(self, pred, _bitmap, dest_width, dest_height):
+        """
+        _bitmap: single map with shape (1, H, W),
+                whose values are binarized as {0, 1}
+        """
+
+        bitmap = _bitmap
+        height, width = bitmap.shape
+
+        outs = cv2.findContours(
+            (bitmap * 255).astype(np.uint8), cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE
+        )
+        if len(outs) == 3:
+            img, contours, _ = outs[0], outs[1], outs[2]
+        elif len(outs) == 2:
+            contours, _ = outs[0], outs[1]
+
+        num_contours = min(len(contours), self.max_candidates)
+
+        boxes = []
+        scores = []
+        for index in range(num_contours):
+            contour = contours[index]
+            points, sside = self.get_mini_boxes(contour)
+            if sside < self.min_size:
+                continue
+            points = np.array(points)
+            if self.score_mode == "fast":
+                score = self.box_score_fast(pred, points.reshape(-1, 2))
+            else:
+                score = self.box_score_slow(pred, contour)
+            if self.box_thresh > score:
+                continue
+
+            box = self.unclip(points).reshape(-1, 1, 2)
+            box, sside = self.get_mini_boxes(box)
+            if sside < self.min_size + 2:
+                continue
+            box = np.array(box)
+
+            box[:, 0] = np.clip(np.round(box[:, 0] / width * dest_width), 0, dest_width)
+            box[:, 1] = np.clip(
+                np.round(box[:, 1] / height * dest_height), 0, dest_height
+            )
+            boxes.append(box.astype(np.int16))
+            scores.append(score)
+        return np.array(boxes, dtype=np.int16), scores
+
+    def unclip(self, box):
+        unclip_ratio = self.unclip_ratio
+        poly = Polygon(box)
+        distance = poly.area * unclip_ratio / poly.length
+        offset = pyclipper.PyclipperOffset()
+        offset.AddPath(box, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
+        expanded = np.array(offset.Execute(distance))
+        return expanded
+
+    def get_mini_boxes(self, contour):
+        bounding_box = cv2.minAreaRect(contour)
+        points = sorted(list(cv2.boxPoints(bounding_box)), key=lambda x: x[0])
+
+        index_1, index_2, index_3, index_4 = 0, 1, 2, 3
+        if points[1][1] > points[0][1]:
+            index_1 = 0
+            index_4 = 1
+        else:
+            index_1 = 1
+            index_4 = 0
+        if points[3][1] > points[2][1]:
+            index_2 = 2
+            index_3 = 3
+        else:
+            index_2 = 3
+            index_3 = 2
+
+        box = [points[index_1], points[index_2], points[index_3], points[index_4]]
+        return box, min(bounding_box[1])
+
+    def box_score_fast(self, bitmap, _box):
+        """
+        box_score_fast: use bbox mean score as the mean score
+        """
+        h, w = bitmap.shape[:2]
+        box = _box.copy()
+        xmin = np.clip(np.floor(box[:, 0].min()).astype(np.int), 0, w - 1)
+        xmax = np.clip(np.ceil(box[:, 0].max()).astype(np.int), 0, w - 1)
+        ymin = np.clip(np.floor(box[:, 1].min()).astype(np.int), 0, h - 1)
+        ymax = np.clip(np.ceil(box[:, 1].max()).astype(np.int), 0, h - 1)
+
+        mask = np.zeros((ymax - ymin + 1, xmax - xmin + 1), dtype=np.uint8)
+        box[:, 0] = box[:, 0] - xmin
+        box[:, 1] = box[:, 1] - ymin
+        cv2.fillPoly(mask, box.reshape(1, -1, 2).astype(np.int32), 1)
+        return cv2.mean(bitmap[ymin : ymax + 1, xmin : xmax + 1], mask)[0]
+
+    def box_score_slow(self, bitmap, contour):
+        """
+        box_score_slow: use polyon mean score as the mean score
+        """
+        h, w = bitmap.shape[:2]
+        contour = contour.copy()
+        contour = np.reshape(contour, (-1, 2))
+
+        xmin = np.clip(np.min(contour[:, 0]), 0, w - 1)
+        xmax = np.clip(np.max(contour[:, 0]), 0, w - 1)
+        ymin = np.clip(np.min(contour[:, 1]), 0, h - 1)
+        ymax = np.clip(np.max(contour[:, 1]), 0, h - 1)
+
+        mask = np.zeros((ymax - ymin + 1, xmax - xmin + 1), dtype=np.uint8)
+
+        contour[:, 0] = contour[:, 0] - xmin
+        contour[:, 1] = contour[:, 1] - ymin
+
+        cv2.fillPoly(mask, contour.reshape(1, -1, 2).astype(np.int32), 1)
+        return cv2.mean(bitmap[ymin : ymax + 1, xmin : xmax + 1], mask)[0]
+
+    def __call__(self, outs_dict, shape_list):
+        pred = outs_dict["maps"]
+        if isinstance(pred, paddle.Tensor):
+            pred = pred.numpy()
+        pred = pred[:, 0, :, :]
+        segmentation = pred > self.thresh
+
+        boxes_batch = []
+        for batch_index in range(pred.shape[0]):
+            src_h, src_w, ratio_h, ratio_w = shape_list[batch_index]
+            if self.dilation_kernel is not None:
+                mask = cv2.dilate(
+                    np.array(segmentation[batch_index]).astype(np.uint8),
+                    self.dilation_kernel,
+                )
+            else:
+                mask = segmentation[batch_index]
+            boxes, scores = self.boxes_from_bitmap(
+                pred[batch_index], mask, src_w, src_h
+            )
+
+            boxes_batch.append({"points": boxes})
+        return boxes_batch
+
+
+class DistillationDBPostProcess(object):
+    def __init__(
+        self,
+        model_name=["student"],
+        key=None,
+        thresh=0.3,
+        box_thresh=0.6,
+        max_candidates=1000,
+        unclip_ratio=1.5,
+        use_dilation=False,
+        score_mode="fast",
+        **kwargs
+    ):
+        self.model_name = model_name
+        self.key = key
+        self.post_process = DBPostProcess(
+            thresh=thresh,
+            box_thresh=box_thresh,
+            max_candidates=max_candidates,
+            unclip_ratio=unclip_ratio,
+            use_dilation=use_dilation,
+            score_mode=score_mode,
+        )
+
+    def __call__(self, predicts, shape_list):
+        results = {}
+        for k in self.model_name:
+            results[k] = self.post_process(predicts[k], shape_list=shape_list)
+        return results

ocr/postprocess/east_postprocess.py

@@ -0,0 +1,122 @@
+from __future__ import absolute_import, division, print_function
+
+import cv2
+import numpy as np
+import paddle
+
+from .locality_aware_nms import nms_locality
+
+
+class EASTPostProcess(object):
+    """
+    The post process for EAST.
+    """
+
+    def __init__(self, score_thresh=0.8, cover_thresh=0.1, nms_thresh=0.2, **kwargs):
+
+        self.score_thresh = score_thresh
+        self.cover_thresh = cover_thresh
+        self.nms_thresh = nms_thresh
+
+    def restore_rectangle_quad(self, origin, geometry):
+        """
+        Restore rectangle from quadrangle.
+        """
+        # quad
+        origin_concat = np.concatenate(
+            (origin, origin, origin, origin), axis=1
+        )  # (n, 8)
+        pred_quads = origin_concat - geometry
+        pred_quads = pred_quads.reshape((-1, 4, 2))  # (n, 4, 2)
+        return pred_quads
+
+    def detect(
+        self, score_map, geo_map, score_thresh=0.8, cover_thresh=0.1, nms_thresh=0.2
+    ):
+        """
+        restore text boxes from score map and geo map
+        """
+
+        score_map = score_map[0]
+        geo_map = np.swapaxes(geo_map, 1, 0)
+        geo_map = np.swapaxes(geo_map, 1, 2)
+        # filter the score map
+        xy_text = np.argwhere(score_map > score_thresh)
+        if len(xy_text) == 0:
+            return []
+        # sort the text boxes via the y axis
+        xy_text = xy_text[np.argsort(xy_text[:, 0])]
+        # restore quad proposals
+        text_box_restored = self.restore_rectangle_quad(
+            xy_text[:, ::-1] * 4, geo_map[xy_text[:, 0], xy_text[:, 1], :]
+        )
+        boxes = np.zeros((text_box_restored.shape[0], 9), dtype=np.float32)
+        boxes[:, :8] = text_box_restored.reshape((-1, 8))
+        boxes[:, 8] = score_map[xy_text[:, 0], xy_text[:, 1]]
+
+        try:
+            import lanms
+
+            boxes = lanms.merge_quadrangle_n9(boxes, nms_thresh)
+        except:
+            print(
+                "you should install lanms by pip3 install lanms-nova to speed up nms_locality"
+            )
+            boxes = nms_locality(boxes.astype(np.float64), nms_thresh)
+        if boxes.shape[0] == 0:
+            return []
+        # Here we filter some low score boxes by the average score map,
+        #   this is different from the orginal paper.
+        for i, box in enumerate(boxes):
+            mask = np.zeros_like(score_map, dtype=np.uint8)
+            cv2.fillPoly(mask, box[:8].reshape((-1, 4, 2)).astype(np.int32) // 4, 1)
+            boxes[i, 8] = cv2.mean(score_map, mask)[0]
+        boxes = boxes[boxes[:, 8] > cover_thresh]
+        return boxes
+
+    def sort_poly(self, p):
+        """
+        Sort polygons.
+        """
+        min_axis = np.argmin(np.sum(p, axis=1))
+        p = p[[min_axis, (min_axis + 1) % 4, (min_axis + 2) % 4, (min_axis + 3) % 4]]
+        if abs(p[0, 0] - p[1, 0]) > abs(p[0, 1] - p[1, 1]):
+            return p
+        else:
+            return p[[0, 3, 2, 1]]
+
+    def __call__(self, outs_dict, shape_list):
+        score_list = outs_dict["f_score"]
+        geo_list = outs_dict["f_geo"]
+        if isinstance(score_list, paddle.Tensor):
+            score_list = score_list.numpy()
+            geo_list = geo_list.numpy()
+        img_num = len(shape_list)
+        dt_boxes_list = []
+        for ino in range(img_num):
+            score = score_list[ino]
+            geo = geo_list[ino]
+            boxes = self.detect(
+                score_map=score,
+                geo_map=geo,
+                score_thresh=self.score_thresh,
+                cover_thresh=self.cover_thresh,
+                nms_thresh=self.nms_thresh,
+            )
+            boxes_norm = []
+            if len(boxes) > 0:
+                h, w = score.shape[1:]
+                src_h, src_w, ratio_h, ratio_w = shape_list[ino]
+                boxes = boxes[:, :8].reshape((-1, 4, 2))
+                boxes[:, :, 0] /= ratio_w
+                boxes[:, :, 1] /= ratio_h
+                for i_box, box in enumerate(boxes):
+                    box = self.sort_poly(box.astype(np.int32))
+                    if (
+                        np.linalg.norm(box[0] - box[1]) < 5
+                        or np.linalg.norm(box[3] - box[0]) < 5
+                    ):
+                        continue
+                    boxes_norm.append(box)
+            dt_boxes_list.append({"points": np.array(boxes_norm)})
+        return dt_boxes_list

ocr/postprocess/extract_textpoint_fast.py

@@ -0,0 +1,464 @@
+from __future__ import absolute_import, division, print_function
+
+from itertools import groupby
+
+import cv2
+import numpy as np
+from skimage.morphology._skeletonize import thin
+
+
+def get_dict(character_dict_path):
+    character_str = ""
+    with open(character_dict_path, "rb") as fin:
+        lines = fin.readlines()
+        for line in lines:
+            line = line.decode("utf-8").strip("\n").strip("\r\n")
+            character_str += line
+        dict_character = list(character_str)
+    return dict_character
+
+
+def softmax(logits):
+    """
+    logits: N x d
+    """
+    max_value = np.max(logits, axis=1, keepdims=True)
+    exp = np.exp(logits - max_value)
+    exp_sum = np.sum(exp, axis=1, keepdims=True)
+    dist = exp / exp_sum
+    return dist
+
+
+def get_keep_pos_idxs(labels, remove_blank=None):
+    """
+    Remove duplicate and get pos idxs of keep items.
+    The value of keep_blank should be [None, 95].
+    """
+    duplicate_len_list = []
+    keep_pos_idx_list = []
+    keep_char_idx_list = []
+    for k, v_ in groupby(labels):
+        current_len = len(list(v_))
+        if k != remove_blank:
+            current_idx = int(sum(duplicate_len_list) + current_len // 2)
+            keep_pos_idx_list.append(current_idx)
+            keep_char_idx_list.append(k)
+        duplicate_len_list.append(current_len)
+    return keep_char_idx_list, keep_pos_idx_list
+
+
+def remove_blank(labels, blank=0):
+    new_labels = [x for x in labels if x != blank]
+    return new_labels
+
+
+def insert_blank(labels, blank=0):
+    new_labels = [blank]
+    for l in labels:
+        new_labels += [l, blank]
+    return new_labels
+
+
+def ctc_greedy_decoder(probs_seq, blank=95, keep_blank_in_idxs=True):
+    """
+    CTC greedy (best path) decoder.
+    """
+    raw_str = np.argmax(np.array(probs_seq), axis=1)
+    remove_blank_in_pos = None if keep_blank_in_idxs else blank
+    dedup_str, keep_idx_list = get_keep_pos_idxs(
+        raw_str, remove_blank=remove_blank_in_pos
+    )
+    dst_str = remove_blank(dedup_str, blank=blank)
+    return dst_str, keep_idx_list
+
+
+def instance_ctc_greedy_decoder(gather_info, logits_map, pts_num=4):
+    _, _, C = logits_map.shape
+    ys, xs = zip(*gather_info)
+    logits_seq = logits_map[list(ys), list(xs)]
+    probs_seq = logits_seq
+    labels = np.argmax(probs_seq, axis=1)
+    dst_str = [k for k, v_ in groupby(labels) if k != C - 1]
+    detal = len(gather_info) // (pts_num - 1)
+    keep_idx_list = [0] + [detal * (i + 1) for i in range(pts_num - 2)] + [-1]
+    keep_gather_list = [gather_info[idx] for idx in keep_idx_list]
+    return dst_str, keep_gather_list
+
+
+def ctc_decoder_for_image(gather_info_list, logits_map, Lexicon_Table, pts_num=6):
+    """
+    CTC decoder using multiple processes.
+    """
+    decoder_str = []
+    decoder_xys = []
+    for gather_info in gather_info_list:
+        if len(gather_info) < pts_num:
+            continue
+        dst_str, xys_list = instance_ctc_greedy_decoder(
+            gather_info, logits_map, pts_num=pts_num
+        )
+        dst_str_readable = "".join([Lexicon_Table[idx] for idx in dst_str])
+        if len(dst_str_readable) < 2:
+            continue
+        decoder_str.append(dst_str_readable)
+        decoder_xys.append(xys_list)
+    return decoder_str, decoder_xys
+
+
+def sort_with_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+
+    def sort_part_with_direction(pos_list, point_direction):
+        pos_list = np.array(pos_list).reshape(-1, 2)
+        point_direction = np.array(point_direction).reshape(-1, 2)
+        average_direction = np.mean(point_direction, axis=0, keepdims=True)
+        pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+        sorted_list = pos_list[np.argsort(pos_proj_leng)].tolist()
+        sorted_direction = point_direction[np.argsort(pos_proj_leng)].tolist()
+        return sorted_list, sorted_direction
+
+    pos_list = np.array(pos_list).reshape(-1, 2)
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    sorted_point, sorted_direction = sort_part_with_direction(pos_list, point_direction)
+
+    point_num = len(sorted_point)
+    if point_num >= 16:
+        middle_num = point_num // 2
+        first_part_point = sorted_point[:middle_num]
+        first_point_direction = sorted_direction[:middle_num]
+        sorted_fist_part_point, sorted_fist_part_direction = sort_part_with_direction(
+            first_part_point, first_point_direction
+        )
+
+        last_part_point = sorted_point[middle_num:]
+        last_point_direction = sorted_direction[middle_num:]
+        sorted_last_part_point, sorted_last_part_direction = sort_part_with_direction(
+            last_part_point, last_point_direction
+        )
+        sorted_point = sorted_fist_part_point + sorted_last_part_point
+        sorted_direction = sorted_fist_part_direction + sorted_last_part_direction
+
+    return sorted_point, np.array(sorted_direction)
+
+
+def add_id(pos_list, image_id=0):
+    """
+    Add id for gather feature, for inference.
+    """
+    new_list = []
+    for item in pos_list:
+        new_list.append((image_id, item[0], item[1]))
+    return new_list
+
+
+def sort_and_expand_with_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+    h, w, _ = f_direction.shape
+    sorted_list, point_direction = sort_with_direction(pos_list, f_direction)
+
+    point_num = len(sorted_list)
+    sub_direction_len = max(point_num // 3, 2)
+    left_direction = point_direction[:sub_direction_len, :]
+    right_dirction = point_direction[point_num - sub_direction_len :, :]
+
+    left_average_direction = -np.mean(left_direction, axis=0, keepdims=True)
+    left_average_len = np.linalg.norm(left_average_direction)
+    left_start = np.array(sorted_list[0])
+    left_step = left_average_direction / (left_average_len + 1e-6)
+
+    right_average_direction = np.mean(right_dirction, axis=0, keepdims=True)
+    right_average_len = np.linalg.norm(right_average_direction)
+    right_step = right_average_direction / (right_average_len + 1e-6)
+    right_start = np.array(sorted_list[-1])
+
+    append_num = max(int((left_average_len + right_average_len) / 2.0 * 0.15), 1)
+    left_list = []
+    right_list = []
+    for i in range(append_num):
+        ly, lx = (
+            np.round(left_start + left_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ly < h and lx < w and (ly, lx) not in left_list:
+            left_list.append((ly, lx))
+        ry, rx = (
+            np.round(right_start + right_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ry < h and rx < w and (ry, rx) not in right_list:
+            right_list.append((ry, rx))
+
+    all_list = left_list[::-1] + sorted_list + right_list
+    return all_list
+
+
+def sort_and_expand_with_direction_v2(pos_list, f_direction, binary_tcl_map):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    binary_tcl_map: h x w
+    """
+    h, w, _ = f_direction.shape
+    sorted_list, point_direction = sort_with_direction(pos_list, f_direction)
+
+    point_num = len(sorted_list)
+    sub_direction_len = max(point_num // 3, 2)
+    left_direction = point_direction[:sub_direction_len, :]
+    right_dirction = point_direction[point_num - sub_direction_len :, :]
+
+    left_average_direction = -np.mean(left_direction, axis=0, keepdims=True)
+    left_average_len = np.linalg.norm(left_average_direction)
+    left_start = np.array(sorted_list[0])
+    left_step = left_average_direction / (left_average_len + 1e-6)
+
+    right_average_direction = np.mean(right_dirction, axis=0, keepdims=True)
+    right_average_len = np.linalg.norm(right_average_direction)
+    right_step = right_average_direction / (right_average_len + 1e-6)
+    right_start = np.array(sorted_list[-1])
+
+    append_num = max(int((left_average_len + right_average_len) / 2.0 * 0.15), 1)
+    max_append_num = 2 * append_num
+
+    left_list = []
+    right_list = []
+    for i in range(max_append_num):
+        ly, lx = (
+            np.round(left_start + left_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ly < h and lx < w and (ly, lx) not in left_list:
+            if binary_tcl_map[ly, lx] > 0.5:
+                left_list.append((ly, lx))
+            else:
+                break
+
+    for i in range(max_append_num):
+        ry, rx = (
+            np.round(right_start + right_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ry < h and rx < w and (ry, rx) not in right_list:
+            if binary_tcl_map[ry, rx] > 0.5:
+                right_list.append((ry, rx))
+            else:
+                break
+
+    all_list = left_list[::-1] + sorted_list + right_list
+    return all_list
+
+
+def point_pair2poly(point_pair_list):
+    """
+    Transfer vertical point_pairs into poly point in clockwise.
+    """
+    point_num = len(point_pair_list) * 2
+    point_list = [0] * point_num
+    for idx, point_pair in enumerate(point_pair_list):
+        point_list[idx] = point_pair[0]
+        point_list[point_num - 1 - idx] = point_pair[1]
+    return np.array(point_list).reshape(-1, 2)
+
+
+def shrink_quad_along_width(quad, begin_width_ratio=0.0, end_width_ratio=1.0):
+    ratio_pair = np.array([[begin_width_ratio], [end_width_ratio]], dtype=np.float32)
+    p0_1 = quad[0] + (quad[1] - quad[0]) * ratio_pair
+    p3_2 = quad[3] + (quad[2] - quad[3]) * ratio_pair
+    return np.array([p0_1[0], p0_1[1], p3_2[1], p3_2[0]])
+
+
+def expand_poly_along_width(poly, shrink_ratio_of_width=0.3):
+    """
+    expand poly along width.
+    """
+    point_num = poly.shape[0]
+    left_quad = np.array([poly[0], poly[1], poly[-2], poly[-1]], dtype=np.float32)
+    left_ratio = (
+        -shrink_ratio_of_width
+        * np.linalg.norm(left_quad[0] - left_quad[3])
+        / (np.linalg.norm(left_quad[0] - left_quad[1]) + 1e-6)
+    )
+    left_quad_expand = shrink_quad_along_width(left_quad, left_ratio, 1.0)
+    right_quad = np.array(
+        [
+            poly[point_num // 2 - 2],
+            poly[point_num // 2 - 1],
+            poly[point_num // 2],
+            poly[point_num // 2 + 1],
+        ],
+        dtype=np.float32,
+    )
+    right_ratio = 1.0 + shrink_ratio_of_width * np.linalg.norm(
+        right_quad[0] - right_quad[3]
+    ) / (np.linalg.norm(right_quad[0] - right_quad[1]) + 1e-6)
+    right_quad_expand = shrink_quad_along_width(right_quad, 0.0, right_ratio)
+    poly[0] = left_quad_expand[0]
+    poly[-1] = left_quad_expand[-1]
+    poly[point_num // 2 - 1] = right_quad_expand[1]
+    poly[point_num // 2] = right_quad_expand[2]
+    return poly
+
+
+def restore_poly(
+    instance_yxs_list, seq_strs, p_border, ratio_w, ratio_h, src_w, src_h, valid_set
+):
+    poly_list = []
+    keep_str_list = []
+    for yx_center_line, keep_str in zip(instance_yxs_list, seq_strs):
+        if len(keep_str) < 2:
+            print("--> too short, {}".format(keep_str))
+            continue
+
+        offset_expand = 1.0
+        if valid_set == "totaltext":
+            offset_expand = 1.2
+
+        point_pair_list = []
+        for y, x in yx_center_line:
+            offset = p_border[:, y, x].reshape(2, 2) * offset_expand
+            ori_yx = np.array([y, x], dtype=np.float32)
+            point_pair = (
+                (ori_yx + offset)[:, ::-1]
+                * 4.0
+                / np.array([ratio_w, ratio_h]).reshape(-1, 2)
+            )
+            point_pair_list.append(point_pair)
+
+        detected_poly = point_pair2poly(point_pair_list)
+        detected_poly = expand_poly_along_width(
+            detected_poly, shrink_ratio_of_width=0.2
+        )
+        detected_poly[:, 0] = np.clip(detected_poly[:, 0], a_min=0, a_max=src_w)
+        detected_poly[:, 1] = np.clip(detected_poly[:, 1], a_min=0, a_max=src_h)
+
+        keep_str_list.append(keep_str)
+        if valid_set == "partvgg":
+            middle_point = len(detected_poly) // 2
+            detected_poly = detected_poly[[0, middle_point - 1, middle_point, -1], :]
+            poly_list.append(detected_poly)
+        elif valid_set == "totaltext":
+            poly_list.append(detected_poly)
+        else:
+            print("--> Not supported format.")
+            exit(-1)
+    return poly_list, keep_str_list
+
+
+def generate_pivot_list_fast(
+    p_score, p_char_maps, f_direction, Lexicon_Table, score_thresh=0.5
+):
+    """
+    return center point and end point of TCL instance; filter with the char maps;
+    """
+    p_score = p_score[0]
+    f_direction = f_direction.transpose(1, 2, 0)
+    p_tcl_map = (p_score > score_thresh) * 1.0
+    skeleton_map = thin(p_tcl_map.astype(np.uint8))
+    instance_count, instance_label_map = cv2.connectedComponents(
+        skeleton_map.astype(np.uint8), connectivity=8
+    )
+
+    # get TCL Instance
+    all_pos_yxs = []
+    if instance_count > 0:
+        for instance_id in range(1, instance_count):
+            pos_list = []
+            ys, xs = np.where(instance_label_map == instance_id)
+            pos_list = list(zip(ys, xs))
+
+            if len(pos_list) < 3:
+                continue
+
+            pos_list_sorted = sort_and_expand_with_direction_v2(
+                pos_list, f_direction, p_tcl_map
+            )
+            all_pos_yxs.append(pos_list_sorted)
+
+    p_char_maps = p_char_maps.transpose([1, 2, 0])
+    decoded_str, keep_yxs_list = ctc_decoder_for_image(
+        all_pos_yxs, logits_map=p_char_maps, Lexicon_Table=Lexicon_Table
+    )
+    return keep_yxs_list, decoded_str
+
+
+def extract_main_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+    pos_list = np.array(pos_list)
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    average_direction = np.mean(point_direction, axis=0, keepdims=True)
+    average_direction = average_direction / (np.linalg.norm(average_direction) + 1e-6)
+    return average_direction
+
+
+def sort_by_direction_with_image_id_deprecated(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[id, y, x], [id, y, x], [id, y, x] ...]
+    """
+    pos_list_full = np.array(pos_list).reshape(-1, 3)
+    pos_list = pos_list_full[:, 1:]
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    average_direction = np.mean(point_direction, axis=0, keepdims=True)
+    pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+    sorted_list = pos_list_full[np.argsort(pos_proj_leng)].tolist()
+    return sorted_list
+
+
+def sort_by_direction_with_image_id(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+
+    def sort_part_with_direction(pos_list_full, point_direction):
+        pos_list_full = np.array(pos_list_full).reshape(-1, 3)
+        pos_list = pos_list_full[:, 1:]
+        point_direction = np.array(point_direction).reshape(-1, 2)
+        average_direction = np.mean(point_direction, axis=0, keepdims=True)
+        pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+        sorted_list = pos_list_full[np.argsort(pos_proj_leng)].tolist()
+        sorted_direction = point_direction[np.argsort(pos_proj_leng)].tolist()
+        return sorted_list, sorted_direction
+
+    pos_list = np.array(pos_list).reshape(-1, 3)
+    point_direction = f_direction[pos_list[:, 1], pos_list[:, 2]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    sorted_point, sorted_direction = sort_part_with_direction(pos_list, point_direction)
+
+    point_num = len(sorted_point)
+    if point_num >= 16:
+        middle_num = point_num // 2
+        first_part_point = sorted_point[:middle_num]
+        first_point_direction = sorted_direction[:middle_num]
+        sorted_fist_part_point, sorted_fist_part_direction = sort_part_with_direction(
+            first_part_point, first_point_direction
+        )
+
+        last_part_point = sorted_point[middle_num:]
+        last_point_direction = sorted_direction[middle_num:]
+        sorted_last_part_point, sorted_last_part_direction = sort_part_with_direction(
+            last_part_point, last_point_direction
+        )
+        sorted_point = sorted_fist_part_point + sorted_last_part_point
+        sorted_direction = sorted_fist_part_direction + sorted_last_part_direction
+
+    return sorted_point

ocr/postprocess/extract_textpoint_slow.py

@@ -0,0 +1,608 @@
+from __future__ import absolute_import, division, print_function
+
+import math
+from itertools import groupby
+
+import cv2
+import numpy as np
+from skimage.morphology._skeletonize import thin
+
+
+def get_dict(character_dict_path):
+    character_str = ""
+    with open(character_dict_path, "rb") as fin:
+        lines = fin.readlines()
+        for line in lines:
+            line = line.decode("utf-8").strip("\n").strip("\r\n")
+            character_str += line
+        dict_character = list(character_str)
+    return dict_character
+
+
+def point_pair2poly(point_pair_list):
+    """
+    Transfer vertical point_pairs into poly point in clockwise.
+    """
+    pair_length_list = []
+    for point_pair in point_pair_list:
+        pair_length = np.linalg.norm(point_pair[0] - point_pair[1])
+        pair_length_list.append(pair_length)
+    pair_length_list = np.array(pair_length_list)
+    pair_info = (
+        pair_length_list.max(),
+        pair_length_list.min(),
+        pair_length_list.mean(),
+    )
+
+    point_num = len(point_pair_list) * 2
+    point_list = [0] * point_num
+    for idx, point_pair in enumerate(point_pair_list):
+        point_list[idx] = point_pair[0]
+        point_list[point_num - 1 - idx] = point_pair[1]
+    return np.array(point_list).reshape(-1, 2), pair_info
+
+
+def shrink_quad_along_width(quad, begin_width_ratio=0.0, end_width_ratio=1.0):
+    """
+    Generate shrink_quad_along_width.
+    """
+    ratio_pair = np.array([[begin_width_ratio], [end_width_ratio]], dtype=np.float32)
+    p0_1 = quad[0] + (quad[1] - quad[0]) * ratio_pair
+    p3_2 = quad[3] + (quad[2] - quad[3]) * ratio_pair
+    return np.array([p0_1[0], p0_1[1], p3_2[1], p3_2[0]])
+
+
+def expand_poly_along_width(poly, shrink_ratio_of_width=0.3):
+    """
+    expand poly along width.
+    """
+    point_num = poly.shape[0]
+    left_quad = np.array([poly[0], poly[1], poly[-2], poly[-1]], dtype=np.float32)
+    left_ratio = (
+        -shrink_ratio_of_width
+        * np.linalg.norm(left_quad[0] - left_quad[3])
+        / (np.linalg.norm(left_quad[0] - left_quad[1]) + 1e-6)
+    )
+    left_quad_expand = shrink_quad_along_width(left_quad, left_ratio, 1.0)
+    right_quad = np.array(
+        [
+            poly[point_num // 2 - 2],
+            poly[point_num // 2 - 1],
+            poly[point_num // 2],
+            poly[point_num // 2 + 1],
+        ],
+        dtype=np.float32,
+    )
+    right_ratio = 1.0 + shrink_ratio_of_width * np.linalg.norm(
+        right_quad[0] - right_quad[3]
+    ) / (np.linalg.norm(right_quad[0] - right_quad[1]) + 1e-6)
+    right_quad_expand = shrink_quad_along_width(right_quad, 0.0, right_ratio)
+    poly[0] = left_quad_expand[0]
+    poly[-1] = left_quad_expand[-1]
+    poly[point_num // 2 - 1] = right_quad_expand[1]
+    poly[point_num // 2] = right_quad_expand[2]
+    return poly
+
+
+def softmax(logits):
+    """
+    logits: N x d
+    """
+    max_value = np.max(logits, axis=1, keepdims=True)
+    exp = np.exp(logits - max_value)
+    exp_sum = np.sum(exp, axis=1, keepdims=True)
+    dist = exp / exp_sum
+    return dist
+
+
+def get_keep_pos_idxs(labels, remove_blank=None):
+    """
+    Remove duplicate and get pos idxs of keep items.
+    The value of keep_blank should be [None, 95].
+    """
+    duplicate_len_list = []
+    keep_pos_idx_list = []
+    keep_char_idx_list = []
+    for k, v_ in groupby(labels):
+        current_len = len(list(v_))
+        if k != remove_blank:
+            current_idx = int(sum(duplicate_len_list) + current_len // 2)
+            keep_pos_idx_list.append(current_idx)
+            keep_char_idx_list.append(k)
+        duplicate_len_list.append(current_len)
+    return keep_char_idx_list, keep_pos_idx_list
+
+
+def remove_blank(labels, blank=0):
+    new_labels = [x for x in labels if x != blank]
+    return new_labels
+
+
+def insert_blank(labels, blank=0):
+    new_labels = [blank]
+    for l in labels:
+        new_labels += [l, blank]
+    return new_labels
+
+
+def ctc_greedy_decoder(probs_seq, blank=95, keep_blank_in_idxs=True):
+    """
+    CTC greedy (best path) decoder.
+    """
+    raw_str = np.argmax(np.array(probs_seq), axis=1)
+    remove_blank_in_pos = None if keep_blank_in_idxs else blank
+    dedup_str, keep_idx_list = get_keep_pos_idxs(
+        raw_str, remove_blank=remove_blank_in_pos
+    )
+    dst_str = remove_blank(dedup_str, blank=blank)
+    return dst_str, keep_idx_list
+
+
+def instance_ctc_greedy_decoder(gather_info, logits_map, keep_blank_in_idxs=True):
+    """
+    gather_info: [[x, y], [x, y] ...]
+    logits_map: H x W X (n_chars + 1)
+    """
+    _, _, C = logits_map.shape
+    ys, xs = zip(*gather_info)
+    logits_seq = logits_map[list(ys), list(xs)]  # n x 96
+    probs_seq = softmax(logits_seq)
+    dst_str, keep_idx_list = ctc_greedy_decoder(
+        probs_seq, blank=C - 1, keep_blank_in_idxs=keep_blank_in_idxs
+    )
+    keep_gather_list = [gather_info[idx] for idx in keep_idx_list]
+    return dst_str, keep_gather_list
+
+
+def ctc_decoder_for_image(gather_info_list, logits_map, keep_blank_in_idxs=True):
+    """
+    CTC decoder using multiple processes.
+    """
+    decoder_results = []
+    for gather_info in gather_info_list:
+        res = instance_ctc_greedy_decoder(
+            gather_info, logits_map, keep_blank_in_idxs=keep_blank_in_idxs
+        )
+        decoder_results.append(res)
+    return decoder_results
+
+
+def sort_with_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+
+    def sort_part_with_direction(pos_list, point_direction):
+        pos_list = np.array(pos_list).reshape(-1, 2)
+        point_direction = np.array(point_direction).reshape(-1, 2)
+        average_direction = np.mean(point_direction, axis=0, keepdims=True)
+        pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+        sorted_list = pos_list[np.argsort(pos_proj_leng)].tolist()
+        sorted_direction = point_direction[np.argsort(pos_proj_leng)].tolist()
+        return sorted_list, sorted_direction
+
+    pos_list = np.array(pos_list).reshape(-1, 2)
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    sorted_point, sorted_direction = sort_part_with_direction(pos_list, point_direction)
+
+    point_num = len(sorted_point)
+    if point_num >= 16:
+        middle_num = point_num // 2
+        first_part_point = sorted_point[:middle_num]
+        first_point_direction = sorted_direction[:middle_num]
+        sorted_fist_part_point, sorted_fist_part_direction = sort_part_with_direction(
+            first_part_point, first_point_direction
+        )
+
+        last_part_point = sorted_point[middle_num:]
+        last_point_direction = sorted_direction[middle_num:]
+        sorted_last_part_point, sorted_last_part_direction = sort_part_with_direction(
+            last_part_point, last_point_direction
+        )
+        sorted_point = sorted_fist_part_point + sorted_last_part_point
+        sorted_direction = sorted_fist_part_direction + sorted_last_part_direction
+
+    return sorted_point, np.array(sorted_direction)
+
+
+def add_id(pos_list, image_id=0):
+    """
+    Add id for gather feature, for inference.
+    """
+    new_list = []
+    for item in pos_list:
+        new_list.append((image_id, item[0], item[1]))
+    return new_list
+
+
+def sort_and_expand_with_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+    h, w, _ = f_direction.shape
+    sorted_list, point_direction = sort_with_direction(pos_list, f_direction)
+
+    # expand along
+    point_num = len(sorted_list)
+    sub_direction_len = max(point_num // 3, 2)
+    left_direction = point_direction[:sub_direction_len, :]
+    right_dirction = point_direction[point_num - sub_direction_len :, :]
+
+    left_average_direction = -np.mean(left_direction, axis=0, keepdims=True)
+    left_average_len = np.linalg.norm(left_average_direction)
+    left_start = np.array(sorted_list[0])
+    left_step = left_average_direction / (left_average_len + 1e-6)
+
+    right_average_direction = np.mean(right_dirction, axis=0, keepdims=True)
+    right_average_len = np.linalg.norm(right_average_direction)
+    right_step = right_average_direction / (right_average_len + 1e-6)
+    right_start = np.array(sorted_list[-1])
+
+    append_num = max(int((left_average_len + right_average_len) / 2.0 * 0.15), 1)
+    left_list = []
+    right_list = []
+    for i in range(append_num):
+        ly, lx = (
+            np.round(left_start + left_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ly < h and lx < w and (ly, lx) not in left_list:
+            left_list.append((ly, lx))
+        ry, rx = (
+            np.round(right_start + right_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ry < h and rx < w and (ry, rx) not in right_list:
+            right_list.append((ry, rx))
+
+    all_list = left_list[::-1] + sorted_list + right_list
+    return all_list
+
+
+def sort_and_expand_with_direction_v2(pos_list, f_direction, binary_tcl_map):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    binary_tcl_map: h x w
+    """
+    h, w, _ = f_direction.shape
+    sorted_list, point_direction = sort_with_direction(pos_list, f_direction)
+
+    # expand along
+    point_num = len(sorted_list)
+    sub_direction_len = max(point_num // 3, 2)
+    left_direction = point_direction[:sub_direction_len, :]
+    right_dirction = point_direction[point_num - sub_direction_len :, :]
+
+    left_average_direction = -np.mean(left_direction, axis=0, keepdims=True)
+    left_average_len = np.linalg.norm(left_average_direction)
+    left_start = np.array(sorted_list[0])
+    left_step = left_average_direction / (left_average_len + 1e-6)
+
+    right_average_direction = np.mean(right_dirction, axis=0, keepdims=True)
+    right_average_len = np.linalg.norm(right_average_direction)
+    right_step = right_average_direction / (right_average_len + 1e-6)
+    right_start = np.array(sorted_list[-1])
+
+    append_num = max(int((left_average_len + right_average_len) / 2.0 * 0.15), 1)
+    max_append_num = 2 * append_num
+
+    left_list = []
+    right_list = []
+    for i in range(max_append_num):
+        ly, lx = (
+            np.round(left_start + left_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ly < h and lx < w and (ly, lx) not in left_list:
+            if binary_tcl_map[ly, lx] > 0.5:
+                left_list.append((ly, lx))
+            else:
+                break
+
+    for i in range(max_append_num):
+        ry, rx = (
+            np.round(right_start + right_step * (i + 1))
+            .flatten()
+            .astype("int32")
+            .tolist()
+        )
+        if ry < h and rx < w and (ry, rx) not in right_list:
+            if binary_tcl_map[ry, rx] > 0.5:
+                right_list.append((ry, rx))
+            else:
+                break
+
+    all_list = left_list[::-1] + sorted_list + right_list
+    return all_list
+
+
+def generate_pivot_list_curved(
+    p_score,
+    p_char_maps,
+    f_direction,
+    score_thresh=0.5,
+    is_expand=True,
+    is_backbone=False,
+    image_id=0,
+):
+    """
+    return center point and end point of TCL instance; filter with the char maps;
+    """
+    p_score = p_score[0]
+    f_direction = f_direction.transpose(1, 2, 0)
+    p_tcl_map = (p_score > score_thresh) * 1.0
+    skeleton_map = thin(p_tcl_map)
+    instance_count, instance_label_map = cv2.connectedComponents(
+        skeleton_map.astype(np.uint8), connectivity=8
+    )
+
+    # get TCL Instance
+    all_pos_yxs = []
+    center_pos_yxs = []
+    end_points_yxs = []
+    instance_center_pos_yxs = []
+    pred_strs = []
+    if instance_count > 0:
+        for instance_id in range(1, instance_count):
+            pos_list = []
+            ys, xs = np.where(instance_label_map == instance_id)
+            pos_list = list(zip(ys, xs))
+
+            ### FIX-ME, eliminate outlier
+            if len(pos_list) < 3:
+                continue
+
+            if is_expand:
+                pos_list_sorted = sort_and_expand_with_direction_v2(
+                    pos_list, f_direction, p_tcl_map
+                )
+            else:
+                pos_list_sorted, _ = sort_with_direction(pos_list, f_direction)
+            all_pos_yxs.append(pos_list_sorted)
+
+    # use decoder to filter backgroud points.
+    p_char_maps = p_char_maps.transpose([1, 2, 0])
+    decode_res = ctc_decoder_for_image(
+        all_pos_yxs, logits_map=p_char_maps, keep_blank_in_idxs=True
+    )
+    for decoded_str, keep_yxs_list in decode_res:
+        if is_backbone:
+            keep_yxs_list_with_id = add_id(keep_yxs_list, image_id=image_id)
+            instance_center_pos_yxs.append(keep_yxs_list_with_id)
+            pred_strs.append(decoded_str)
+        else:
+            end_points_yxs.extend((keep_yxs_list[0], keep_yxs_list[-1]))
+            center_pos_yxs.extend(keep_yxs_list)
+
+    if is_backbone:
+        return pred_strs, instance_center_pos_yxs
+    else:
+        return center_pos_yxs, end_points_yxs
+
+
+def generate_pivot_list_horizontal(
+    p_score, p_char_maps, f_direction, score_thresh=0.5, is_backbone=False, image_id=0
+):
+    """
+    return center point and end point of TCL instance; filter with the char maps;
+    """
+    p_score = p_score[0]
+    f_direction = f_direction.transpose(1, 2, 0)
+    p_tcl_map_bi = (p_score > score_thresh) * 1.0
+    instance_count, instance_label_map = cv2.connectedComponents(
+        p_tcl_map_bi.astype(np.uint8), connectivity=8
+    )
+
+    # get TCL Instance
+    all_pos_yxs = []
+    center_pos_yxs = []
+    end_points_yxs = []
+    instance_center_pos_yxs = []
+
+    if instance_count > 0:
+        for instance_id in range(1, instance_count):
+            pos_list = []
+            ys, xs = np.where(instance_label_map == instance_id)
+            pos_list = list(zip(ys, xs))
+
+            ### FIX-ME, eliminate outlier
+            if len(pos_list) < 5:
+                continue
+
+            # add rule here
+            main_direction = extract_main_direction(pos_list, f_direction)  # y x
+            reference_directin = np.array([0, 1]).reshape([-1, 2])  # y x
+            is_h_angle = abs(np.sum(main_direction * reference_directin)) < math.cos(
+                math.pi / 180 * 70
+            )
+
+            point_yxs = np.array(pos_list)
+            max_y, max_x = np.max(point_yxs, axis=0)
+            min_y, min_x = np.min(point_yxs, axis=0)
+            is_h_len = (max_y - min_y) < 1.5 * (max_x - min_x)
+
+            pos_list_final = []
+            if is_h_len:
+                xs = np.unique(xs)
+                for x in xs:
+                    ys = instance_label_map[:, x].copy().reshape((-1,))
+                    y = int(np.where(ys == instance_id)[0].mean())
+                    pos_list_final.append((y, x))
+            else:
+                ys = np.unique(ys)
+                for y in ys:
+                    xs = instance_label_map[y, :].copy().reshape((-1,))
+                    x = int(np.where(xs == instance_id)[0].mean())
+                    pos_list_final.append((y, x))
+
+            pos_list_sorted, _ = sort_with_direction(pos_list_final, f_direction)
+            all_pos_yxs.append(pos_list_sorted)
+
+    # use decoder to filter backgroud points.
+    p_char_maps = p_char_maps.transpose([1, 2, 0])
+    decode_res = ctc_decoder_for_image(
+        all_pos_yxs, logits_map=p_char_maps, keep_blank_in_idxs=True
+    )
+    for decoded_str, keep_yxs_list in decode_res:
+        if is_backbone:
+            keep_yxs_list_with_id = add_id(keep_yxs_list, image_id=image_id)
+            instance_center_pos_yxs.append(keep_yxs_list_with_id)
+        else:
+            end_points_yxs.extend((keep_yxs_list[0], keep_yxs_list[-1]))
+            center_pos_yxs.extend(keep_yxs_list)
+
+    if is_backbone:
+        return instance_center_pos_yxs
+    else:
+        return center_pos_yxs, end_points_yxs
+
+
+def generate_pivot_list_slow(
+    p_score,
+    p_char_maps,
+    f_direction,
+    score_thresh=0.5,
+    is_backbone=False,
+    is_curved=True,
+    image_id=0,
+):
+    """
+    Warp all the function together.
+    """
+    if is_curved:
+        return generate_pivot_list_curved(
+            p_score,
+            p_char_maps,
+            f_direction,
+            score_thresh=score_thresh,
+            is_expand=True,
+            is_backbone=is_backbone,
+            image_id=image_id,
+        )
+    else:
+        return generate_pivot_list_horizontal(
+            p_score,
+            p_char_maps,
+            f_direction,
+            score_thresh=score_thresh,
+            is_backbone=is_backbone,
+            image_id=image_id,
+        )
+
+
+# for refine module
+def extract_main_direction(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+    pos_list = np.array(pos_list)
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    average_direction = np.mean(point_direction, axis=0, keepdims=True)
+    average_direction = average_direction / (np.linalg.norm(average_direction) + 1e-6)
+    return average_direction
+
+
+def sort_by_direction_with_image_id_deprecated(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[id, y, x], [id, y, x], [id, y, x] ...]
+    """
+    pos_list_full = np.array(pos_list).reshape(-1, 3)
+    pos_list = pos_list_full[:, 1:]
+    point_direction = f_direction[pos_list[:, 0], pos_list[:, 1]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    average_direction = np.mean(point_direction, axis=0, keepdims=True)
+    pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+    sorted_list = pos_list_full[np.argsort(pos_proj_leng)].tolist()
+    return sorted_list
+
+
+def sort_by_direction_with_image_id(pos_list, f_direction):
+    """
+    f_direction: h x w x 2
+    pos_list: [[y, x], [y, x], [y, x] ...]
+    """
+
+    def sort_part_with_direction(pos_list_full, point_direction):
+        pos_list_full = np.array(pos_list_full).reshape(-1, 3)
+        pos_list = pos_list_full[:, 1:]
+        point_direction = np.array(point_direction).reshape(-1, 2)
+        average_direction = np.mean(point_direction, axis=0, keepdims=True)
+        pos_proj_leng = np.sum(pos_list * average_direction, axis=1)
+        sorted_list = pos_list_full[np.argsort(pos_proj_leng)].tolist()
+        sorted_direction = point_direction[np.argsort(pos_proj_leng)].tolist()
+        return sorted_list, sorted_direction
+
+    pos_list = np.array(pos_list).reshape(-1, 3)
+    point_direction = f_direction[pos_list[:, 1], pos_list[:, 2]]  # x, y
+    point_direction = point_direction[:, ::-1]  # x, y -> y, x
+    sorted_point, sorted_direction = sort_part_with_direction(pos_list, point_direction)
+
+    point_num = len(sorted_point)
+    if point_num >= 16:
+        middle_num = point_num // 2
+        first_part_point = sorted_point[:middle_num]
+        first_point_direction = sorted_direction[:middle_num]
+        sorted_fist_part_point, sorted_fist_part_direction = sort_part_with_direction(
+            first_part_point, first_point_direction
+        )
+
+        last_part_point = sorted_point[middle_num:]
+        last_point_direction = sorted_direction[middle_num:]
+        sorted_last_part_point, sorted_last_part_direction = sort_part_with_direction(
+            last_part_point, last_point_direction
+        )
+        sorted_point = sorted_fist_part_point + sorted_last_part_point
+        sorted_direction = sorted_fist_part_direction + sorted_last_part_direction
+
+    return sorted_point
+
+
+def generate_pivot_list_tt_inference(
+    p_score,
+    p_char_maps,
+    f_direction,
+    score_thresh=0.5,
+    is_backbone=False,
+    is_curved=True,
+    image_id=0,
+):
+    """
+    return center point and end point of TCL instance; filter with the char maps;
+    """
+    p_score = p_score[0]
+    f_direction = f_direction.transpose(1, 2, 0)
+    p_tcl_map = (p_score > score_thresh) * 1.0
+    skeleton_map = thin(p_tcl_map)
+    instance_count, instance_label_map = cv2.connectedComponents(
+        skeleton_map.astype(np.uint8), connectivity=8
+    )
+
+    # get TCL Instance
+    all_pos_yxs = []
+    if instance_count > 0:
+        for instance_id in range(1, instance_count):
+            pos_list = []
+            ys, xs = np.where(instance_label_map == instance_id)
+            pos_list = list(zip(ys, xs))
+            ### FIX-ME, eliminate outlier
+            if len(pos_list) < 3:
+                continue
+            pos_list_sorted = sort_and_expand_with_direction_v2(
+                pos_list, f_direction, p_tcl_map
+            )
+            pos_list_sorted_with_id = add_id(pos_list_sorted, image_id=image_id)
+            all_pos_yxs.append(pos_list_sorted_with_id)
+    return all_pos_yxs

ocr/postprocess/fce_postprocess.py

@@ -0,0 +1,234 @@
+import cv2
+import numpy as np
+import paddle
+from numpy.fft import ifft
+
+from .poly_nms import *
+
+
+def fill_hole(input_mask):
+    h, w = input_mask.shape
+    canvas = np.zeros((h + 2, w + 2), np.uint8)
+    canvas[1 : h + 1, 1 : w + 1] = input_mask.copy()
+
+    mask = np.zeros((h + 4, w + 4), np.uint8)
+
+    cv2.floodFill(canvas, mask, (0, 0), 1)
+    canvas = canvas[1 : h + 1, 1 : w + 1].astype(np.bool)
+
+    return ~canvas | input_mask
+
+
+def fourier2poly(fourier_coeff, num_reconstr_points=50):
+    """Inverse Fourier transform
+    Args:
+        fourier_coeff (ndarray): Fourier coefficients shaped (n, 2k+1),
+            with n and k being candidates number and Fourier degree
+            respectively.
+        num_reconstr_points (int): Number of reconstructed polygon points.
+    Returns:
+        Polygons (ndarray): The reconstructed polygons shaped (n, n')
+    """
+
+    a = np.zeros((len(fourier_coeff), num_reconstr_points), dtype="complex")
+    k = (len(fourier_coeff[0]) - 1) // 2
+
+    a[:, 0 : k + 1] = fourier_coeff[:, k:]
+    a[:, -k:] = fourier_coeff[:, :k]
+
+    poly_complex = ifft(a) * num_reconstr_points
+    polygon = np.zeros((len(fourier_coeff), num_reconstr_points, 2))
+    polygon[:, :, 0] = poly_complex.real
+    polygon[:, :, 1] = poly_complex.imag
+    return polygon.astype("int32").reshape((len(fourier_coeff), -1))
+
+
+class FCEPostProcess(object):
+    """
+    The post process for FCENet.
+    """
+
+    def __init__(
+        self,
+        scales,
+        fourier_degree=5,
+        num_reconstr_points=50,
+        decoding_type="fcenet",
+        score_thr=0.3,
+        nms_thr=0.1,
+        alpha=1.0,
+        beta=1.0,
+        box_type="poly",
+        **kwargs
+    ):
+
+        self.scales = scales
+        self.fourier_degree = fourier_degree
+        self.num_reconstr_points = num_reconstr_points
+        self.decoding_type = decoding_type
+        self.score_thr = score_thr
+        self.nms_thr = nms_thr
+        self.alpha = alpha
+        self.beta = beta
+        self.box_type = box_type
+
+    def __call__(self, preds, shape_list):
+        score_maps = []
+        for key, value in preds.items():
+            if isinstance(value, paddle.Tensor):
+                value = value.numpy()
+            cls_res = value[:, :4, :, :]
+            reg_res = value[:, 4:, :, :]
+            score_maps.append([cls_res, reg_res])
+
+        return self.get_boundary(score_maps, shape_list)
+
+    def resize_boundary(self, boundaries, scale_factor):
+        """Rescale boundaries via scale_factor.
+
+        Args:
+            boundaries (list[list[float]]): The boundary list. Each boundary
+            with size 2k+1 with k>=4.
+            scale_factor(ndarray): The scale factor of size (4,).
+
+        Returns:
+            boundaries (list[list[float]]): The scaled boundaries.
+        """
+        boxes = []
+        scores = []
+        for b in boundaries:
+            sz = len(b)
+            valid_boundary(b, True)
+            scores.append(b[-1])
+            b = (
+                (
+                    np.array(b[: sz - 1])
+                    * (np.tile(scale_factor[:2], int((sz - 1) / 2)).reshape(1, sz - 1))
+                )
+                .flatten()
+                .tolist()
+            )
+            boxes.append(np.array(b).reshape([-1, 2]))
+
+        return np.array(boxes, dtype=np.float32), scores
+
+    def get_boundary(self, score_maps, shape_list):
+        assert len(score_maps) == len(self.scales)
+        boundaries = []
+        for idx, score_map in enumerate(score_maps):
+            scale = self.scales[idx]
+            boundaries = boundaries + self._get_boundary_single(score_map, scale)
+
+        # nms
+        boundaries = poly_nms(boundaries, self.nms_thr)
+        boundaries, scores = self.resize_boundary(
+            boundaries, (1 / shape_list[0, 2:]).tolist()[::-1]
+        )
+
+        boxes_batch = [dict(points=boundaries, scores=scores)]
+        return boxes_batch
+
+    def _get_boundary_single(self, score_map, scale):
+        assert len(score_map) == 2
+        assert score_map[1].shape[1] == 4 * self.fourier_degree + 2
+
+        return self.fcenet_decode(
+            preds=score_map,
+            fourier_degree=self.fourier_degree,
+            num_reconstr_points=self.num_reconstr_points,
+            scale=scale,
+            alpha=self.alpha,
+            beta=self.beta,
+            box_type=self.box_type,
+            score_thr=self.score_thr,
+            nms_thr=self.nms_thr,
+        )
+
+    def fcenet_decode(
+        self,
+        preds,
+        fourier_degree,
+        num_reconstr_points,
+        scale,
+        alpha=1.0,
+        beta=2.0,
+        box_type="poly",
+        score_thr=0.3,
+        nms_thr=0.1,
+    ):
+        """Decoding predictions of FCENet to instances.
+
+        Args:
+            preds (list(Tensor)): The head output tensors.
+            fourier_degree (int): The maximum Fourier transform degree k.
+            num_reconstr_points (int): The points number of the polygon
+                reconstructed from predicted Fourier coefficients.
+            scale (int): The down-sample scale of the prediction.
+            alpha (float) : The parameter to calculate final scores. Score_{final}
+                    = (Score_{text region} ^ alpha)
+                    * (Score_{text center region}^ beta)
+            beta (float) : The parameter to calculate final score.
+            box_type (str):  Boundary encoding type 'poly' or 'quad'.
+            score_thr (float) : The threshold used to filter out the final
+                candidates.
+            nms_thr (float) :  The threshold of nms.
+
+        Returns:
+            boundaries (list[list[float]]): The instance boundary and confidence
+                list.
+        """
+        assert isinstance(preds, list)
+        assert len(preds) == 2
+        assert box_type in ["poly", "quad"]
+
+        cls_pred = preds[0][0]
+        tr_pred = cls_pred[0:2]
+        tcl_pred = cls_pred[2:]
+
+        reg_pred = preds[1][0].transpose([1, 2, 0])
+        x_pred = reg_pred[:, :, : 2 * fourier_degree + 1]
+        y_pred = reg_pred[:, :, 2 * fourier_degree + 1 :]
+
+        score_pred = (tr_pred[1] ** alpha) * (tcl_pred[1] ** beta)
+        tr_pred_mask = (score_pred) > score_thr
+        tr_mask = fill_hole(tr_pred_mask)
+
+        tr_contours, _ = cv2.findContours(
+            tr_mask.astype(np.uint8), cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE
+        )  # opencv4
+
+        mask = np.zeros_like(tr_mask)
+        boundaries = []
+        for cont in tr_contours:
+            deal_map = mask.copy().astype(np.int8)
+            cv2.drawContours(deal_map, [cont], -1, 1, -1)
+
+            score_map = score_pred * deal_map
+            score_mask = score_map > 0
+            xy_text = np.argwhere(score_mask)
+            dxy = xy_text[:, 1] + xy_text[:, 0] * 1j
+
+            x, y = x_pred[score_mask], y_pred[score_mask]
+            c = x + y * 1j
+            c[:, fourier_degree] = c[:, fourier_degree] + dxy
+            c *= scale
+
+            polygons = fourier2poly(c, num_reconstr_points)
+            score = score_map[score_mask].reshape(-1, 1)
+            polygons = poly_nms(np.hstack((polygons, score)).tolist(), nms_thr)
+
+            boundaries = boundaries + polygons
+
+        boundaries = poly_nms(boundaries, nms_thr)
+
+        if box_type == "quad":
+            new_boundaries = []
+            for boundary in boundaries:
+                poly = np.array(boundary[:-1]).reshape(-1, 2).astype(np.float32)
+                score = boundary[-1]
+                points = cv2.boxPoints(cv2.minAreaRect(poly))
+                points = np.int0(points)
+                new_boundaries.append(points.reshape(-1).tolist() + [score])
+                boundaries = new_boundaries
+
+        return boundaries

ocr/postprocess/locality_aware_nms.py

@@ -0,0 +1,198 @@
+"""
+Locality aware nms.
+This code is refered from: https://github.com/songdejia/EAST/blob/master/locality_aware_nms.py
+"""
+
+import numpy as np
+from shapely.geometry import Polygon
+
+
+def intersection(g, p):
+    """
+    Intersection.
+    """
+    g = Polygon(g[:8].reshape((4, 2)))
+    p = Polygon(p[:8].reshape((4, 2)))
+    g = g.buffer(0)
+    p = p.buffer(0)
+    if not g.is_valid or not p.is_valid:
+        return 0
+    inter = Polygon(g).intersection(Polygon(p)).area
+    union = g.area + p.area - inter
+    if union == 0:
+        return 0
+    else:
+        return inter / union
+
+
+def intersection_iog(g, p):
+    """
+    Intersection_iog.
+    """
+    g = Polygon(g[:8].reshape((4, 2)))
+    p = Polygon(p[:8].reshape((4, 2)))
+    if not g.is_valid or not p.is_valid:
+        return 0
+    inter = Polygon(g).intersection(Polygon(p)).area
+    # union = g.area + p.area - inter
+    union = p.area
+    if union == 0:
+        print("p_area is very small")
+        return 0
+    else:
+        return inter / union
+
+
+def weighted_merge(g, p):
+    """
+    Weighted merge.
+    """
+    g[:8] = (g[8] * g[:8] + p[8] * p[:8]) / (g[8] + p[8])
+    g[8] = g[8] + p[8]
+    return g
+
+
+def standard_nms(S, thres):
+    """
+    Standard nms.
+    """
+    order = np.argsort(S[:, 8])[::-1]
+    keep = []
+    while order.size > 0:
+        i = order[0]
+        keep.append(i)
+        ovr = np.array([intersection(S[i], S[t]) for t in order[1:]])
+
+        inds = np.where(ovr <= thres)[0]
+        order = order[inds + 1]
+
+    return S[keep]
+
+
+def standard_nms_inds(S, thres):
+    """
+    Standard nms, retun inds.
+    """
+    order = np.argsort(S[:, 8])[::-1]
+    keep = []
+    while order.size > 0:
+        i = order[0]
+        keep.append(i)
+        ovr = np.array([intersection(S[i], S[t]) for t in order[1:]])
+
+        inds = np.where(ovr <= thres)[0]
+        order = order[inds + 1]
+
+    return keep
+
+
+def nms(S, thres):
+    """
+    nms.
+    """
+    order = np.argsort(S[:, 8])[::-1]
+    keep = []
+    while order.size > 0:
+        i = order[0]
+        keep.append(i)
+        ovr = np.array([intersection(S[i], S[t]) for t in order[1:]])
+
+        inds = np.where(ovr <= thres)[0]
+        order = order[inds + 1]
+
+    return keep
+
+
+def soft_nms(boxes_in, Nt_thres=0.3, threshold=0.8, sigma=0.5, method=2):
+    """
+    soft_nms
+    :para boxes_in, N x 9 (coords + score)
+    :para threshould, eliminate cases min score(0.001)
+    :para Nt_thres, iou_threshi
+    :para sigma, gaussian weght
+    :method, linear or gaussian
+    """
+    boxes = boxes_in.copy()
+    N = boxes.shape[0]
+    if N is None or N < 1:
+        return np.array([])
+    pos, maxpos = 0, 0
+    weight = 0.0
+    inds = np.arange(N)
+    tbox, sbox = boxes[0].copy(), boxes[0].copy()
+    for i in range(N):
+        maxscore = boxes[i, 8]
+        maxpos = i
+        tbox = boxes[i].copy()
+        ti = inds[i]
+        pos = i + 1
+        # get max box
+        while pos < N:
+            if maxscore < boxes[pos, 8]:
+                maxscore = boxes[pos, 8]
+                maxpos = pos
+            pos = pos + 1
+        # add max box as a detection
+        boxes[i, :] = boxes[maxpos, :]
+        inds[i] = inds[maxpos]
+        # swap
+        boxes[maxpos, :] = tbox
+        inds[maxpos] = ti
+        tbox = boxes[i].copy()
+        pos = i + 1
+        # NMS iteration
+        while pos < N:
+            sbox = boxes[pos].copy()
+            ts_iou_val = intersection(tbox, sbox)
+            if ts_iou_val > 0:
+                if method == 1:
+                    if ts_iou_val > Nt_thres:
+                        weight = 1 - ts_iou_val
+                    else:
+                        weight = 1
+                elif method == 2:
+                    weight = np.exp(-1.0 * ts_iou_val**2 / sigma)
+                else:
+                    if ts_iou_val > Nt_thres:
+                        weight = 0
+                    else:
+                        weight = 1
+                boxes[pos, 8] = weight * boxes[pos, 8]
+                # if box score falls below thresold, discard the box by
+                # swaping last box update N
+                if boxes[pos, 8] < threshold:
+                    boxes[pos, :] = boxes[N - 1, :]
+                    inds[pos] = inds[N - 1]
+                    N = N - 1
+                    pos = pos - 1
+            pos = pos + 1
+
+    return boxes[:N]
+
+
+def nms_locality(polys, thres=0.3):
+    """
+    locality aware nms of EAST
+    :param polys: a N*9 numpy array. first 8 coordinates, then prob
+    :return: boxes after nms
+    """
+    S = []
+    p = None
+    for g in polys:
+        if p is not None and intersection(g, p) > thres:
+            p = weighted_merge(g, p)
+        else:
+            if p is not None:
+                S.append(p)
+            p = g
+    if p is not None:
+        S.append(p)
+
+    if len(S) == 0:
+        return np.array([])
+    return standard_nms(np.array(S), thres)
+
+
+if __name__ == "__main__":
+    # 343,350,448,135,474,143,369,359
+    print(Polygon(np.array([[343, 350], [448, 135], [474, 143], [369, 359]])).area)

ocr/postprocess/pg_postprocess.py

@@ -0,0 +1,189 @@
+from __future__ import absolute_import, division, print_function
+
+import os
+import sys
+
+import paddle
+
+from .extract_textpoint_fast import *
+from .extract_textpoint_slow import *
+
+__dir__ = os.path.dirname(__file__)
+sys.path.append(__dir__)
+sys.path.append(os.path.join(__dir__, ".."))
+
+
+class PGNet_PostProcess(object):
+    # two different post-process
+    def __init__(
+        self, character_dict_path, valid_set, score_thresh, outs_dict, shape_list
+    ):
+        self.Lexicon_Table = get_dict(character_dict_path)
+        self.valid_set = valid_set
+        self.score_thresh = score_thresh
+        self.outs_dict = outs_dict
+        self.shape_list = shape_list
+
+    def pg_postprocess_fast(self):
+        p_score = self.outs_dict["f_score"]
+        p_border = self.outs_dict["f_border"]
+        p_char = self.outs_dict["f_char"]
+        p_direction = self.outs_dict["f_direction"]
+        if isinstance(p_score, paddle.Tensor):
+            p_score = p_score[0].numpy()
+            p_border = p_border[0].numpy()
+            p_direction = p_direction[0].numpy()
+            p_char = p_char[0].numpy()
+        else:
+            p_score = p_score[0]
+            p_border = p_border[0]
+            p_direction = p_direction[0]
+            p_char = p_char[0]
+
+        src_h, src_w, ratio_h, ratio_w = self.shape_list[0]
+        instance_yxs_list, seq_strs = generate_pivot_list_fast(
+            p_score,
+            p_char,
+            p_direction,
+            self.Lexicon_Table,
+            score_thresh=self.score_thresh,
+        )
+        poly_list, keep_str_list = restore_poly(
+            instance_yxs_list,
+            seq_strs,
+            p_border,
+            ratio_w,
+            ratio_h,
+            src_w,
+            src_h,
+            self.valid_set,
+        )
+        data = {
+            "points": poly_list,
+            "texts": keep_str_list,
+        }
+        return data
+
+    def pg_postprocess_slow(self):
+        p_score = self.outs_dict["f_score"]
+        p_border = self.outs_dict["f_border"]
+        p_char = self.outs_dict["f_char"]
+        p_direction = self.outs_dict["f_direction"]
+        if isinstance(p_score, paddle.Tensor):
+            p_score = p_score[0].numpy()
+            p_border = p_border[0].numpy()
+            p_direction = p_direction[0].numpy()
+            p_char = p_char[0].numpy()
+        else:
+            p_score = p_score[0]
+            p_border = p_border[0]
+            p_direction = p_direction[0]
+            p_char = p_char[0]
+        src_h, src_w, ratio_h, ratio_w = self.shape_list[0]
+        is_curved = self.valid_set == "totaltext"
+        char_seq_idx_set, instance_yxs_list = generate_pivot_list_slow(
+            p_score,
+            p_char,
+            p_direction,
+            score_thresh=self.score_thresh,
+            is_backbone=True,
+            is_curved=is_curved,
+        )
+        seq_strs = []
+        for char_idx_set in char_seq_idx_set:
+            pr_str = "".join([self.Lexicon_Table[pos] for pos in char_idx_set])
+            seq_strs.append(pr_str)
+        poly_list = []
+        keep_str_list = []
+        all_point_list = []
+        all_point_pair_list = []
+        for yx_center_line, keep_str in zip(instance_yxs_list, seq_strs):
+            if len(yx_center_line) == 1:
+                yx_center_line.append(yx_center_line[-1])
+
+            offset_expand = 1.0
+            if self.valid_set == "totaltext":
+                offset_expand = 1.2
+
+            point_pair_list = []
+            for batch_id, y, x in yx_center_line:
+                offset = p_border[:, y, x].reshape(2, 2)
+                if offset_expand != 1.0:
+                    offset_length = np.linalg.norm(offset, axis=1, keepdims=True)
+                    expand_length = np.clip(
+                        offset_length * (offset_expand - 1), a_min=0.5, a_max=3.0
+                    )
+                    offset_detal = offset / offset_length * expand_length
+                    offset = offset + offset_detal
+                ori_yx = np.array([y, x], dtype=np.float32)
+                point_pair = (
+                    (ori_yx + offset)[:, ::-1]
+                    * 4.0
+                    / np.array([ratio_w, ratio_h]).reshape(-1, 2)
+                )
+                point_pair_list.append(point_pair)
+
+                all_point_list.append(
+                    [int(round(x * 4.0 / ratio_w)), int(round(y * 4.0 / ratio_h))]
+                )
+                all_point_pair_list.append(point_pair.round().astype(np.int32).tolist())
+
+            detected_poly, pair_length_info = point_pair2poly(point_pair_list)
+            detected_poly = expand_poly_along_width(
+                detected_poly, shrink_ratio_of_width=0.2
+            )
+            detected_poly[:, 0] = np.clip(detected_poly[:, 0], a_min=0, a_max=src_w)
+            detected_poly[:, 1] = np.clip(detected_poly[:, 1], a_min=0, a_max=src_h)
+
+            if len(keep_str) < 2:
+                continue
+
+            keep_str_list.append(keep_str)
+            detected_poly = np.round(detected_poly).astype("int32")
+            if self.valid_set == "partvgg":
+                middle_point = len(detected_poly) // 2
+                detected_poly = detected_poly[
+                    [0, middle_point - 1, middle_point, -1], :
+                ]
+                poly_list.append(detected_poly)
+            elif self.valid_set == "totaltext":
+                poly_list.append(detected_poly)
+            else:
+                print("--> Not supported format.")
+                exit(-1)
+        data = {
+            "points": poly_list,
+            "texts": keep_str_list,
+        }
+        return data
+
+
+class PGPostProcess(object):
+    """
+    The post process for PGNet.
+    """
+
+    def __init__(self, character_dict_path, valid_set, score_thresh, mode, **kwargs):
+        self.character_dict_path = character_dict_path
+        self.valid_set = valid_set
+        self.score_thresh = score_thresh
+        self.mode = mode
+
+        # c++ la-nms is faster, but only support python 3.5
+        self.is_python35 = False
+        if sys.version_info.major == 3 and sys.version_info.minor == 5:
+            self.is_python35 = True
+
+    def __call__(self, outs_dict, shape_list):
+        post = PGNet_PostProcess(
+            self.character_dict_path,
+            self.valid_set,
+            self.score_thresh,
+            outs_dict,
+            shape_list,
+        )
+        if self.mode == "fast":
+            data = post.pg_postprocess_fast()
+        else:
+            data = post.pg_postprocess_slow()
+        return data

ocr/postprocess/poly_nms.py

@@ -0,0 +1,132 @@
+import numpy as np
+from shapely.geometry import Polygon
+
+
+def points2polygon(points):
+    """Convert k points to 1 polygon.
+
+    Args:
+        points (ndarray or list): A ndarray or a list of shape (2k)
+            that indicates k points.
+
+    Returns:
+        polygon (Polygon): A polygon object.
+    """
+    if isinstance(points, list):
+        points = np.array(points)
+
+    assert isinstance(points, np.ndarray)
+    assert (points.size % 2 == 0) and (points.size >= 8)
+
+    point_mat = points.reshape([-1, 2])
+    return Polygon(point_mat)
+
+
+def poly_intersection(poly_det, poly_gt, buffer=0.0001):
+    """Calculate the intersection area between two polygon.
+
+    Args:
+        poly_det (Polygon): A polygon predicted by detector.
+        poly_gt (Polygon): A gt polygon.
+
+    Returns:
+        intersection_area (float): The intersection area between two polygons.
+    """
+    assert isinstance(poly_det, Polygon)
+    assert isinstance(poly_gt, Polygon)
+
+    if buffer == 0:
+        poly_inter = poly_det & poly_gt
+    else:
+        poly_inter = poly_det.buffer(buffer) & poly_gt.buffer(buffer)
+    return poly_inter.area, poly_inter
+
+
+def poly_union(poly_det, poly_gt):
+    """Calculate the union area between two polygon.
+
+    Args:
+        poly_det (Polygon): A polygon predicted by detector.
+        poly_gt (Polygon): A gt polygon.
+
+    Returns:
+        union_area (float): The union area between two polygons.
+    """
+    assert isinstance(poly_det, Polygon)
+    assert isinstance(poly_gt, Polygon)
+
+    area_det = poly_det.area
+    area_gt = poly_gt.area
+    area_inters, _ = poly_intersection(poly_det, poly_gt)
+    return area_det + area_gt - area_inters
+
+
+def valid_boundary(x, with_score=True):
+    num = len(x)
+    if num < 8:
+        return False
+    if num % 2 == 0 and (not with_score):
+        return True
+    if num % 2 == 1 and with_score:
+        return True
+
+    return False
+
+
+def boundary_iou(src, target):
+    """Calculate the IOU between two boundaries.
+
+    Args:
+       src (list): Source boundary.
+       target (list): Target boundary.
+
+    Returns:
+       iou (float): The iou between two boundaries.
+    """
+    assert valid_boundary(src, False)
+    assert valid_boundary(target, False)
+    src_poly = points2polygon(src)
+    target_poly = points2polygon(target)
+
+    return poly_iou(src_poly, target_poly)
+
+
+def poly_iou(poly_det, poly_gt):
+    """Calculate the IOU between two polygons.
+
+    Args:
+        poly_det (Polygon): A polygon predicted by detector.
+        poly_gt (Polygon): A gt polygon.
+
+    Returns:
+        iou (float): The IOU between two polygons.
+    """
+    assert isinstance(poly_det, Polygon)
+    assert isinstance(poly_gt, Polygon)
+    area_inters, _ = poly_intersection(poly_det, poly_gt)
+    area_union = poly_union(poly_det, poly_gt)
+    if area_union == 0:
+        return 0.0
+    return area_inters / area_union
+
+
+def poly_nms(polygons, threshold):
+    assert isinstance(polygons, list)
+
+    polygons = np.array(sorted(polygons, key=lambda x: x[-1]))
+
+    keep_poly = []
+    index = [i for i in range(polygons.shape[0])]
+
+    while len(index) > 0:
+        keep_poly.append(polygons[index[-1]].tolist())
+        A = polygons[index[-1]][:-1]
+        index = np.delete(index, -1)
+        iou_list = np.zeros((len(index),))
+        for i in range(len(index)):
+            B = polygons[index[i]][:-1]
+            iou_list[i] = boundary_iou(A, B)
+        remove_index = np.where(iou_list > threshold)
+        index = np.delete(index, remove_index)
+
+    return keep_poly

ocr/postprocess/pse_postprocess/__init__.py

@@ -0,0 +1 @@
+from .pse_postprocess import PSEPostProcess

ocr/postprocess/pse_postprocess/pse/__init__.py

@@ -0,0 +1,20 @@
+import os
+import subprocess
+import sys
+
+python_path = sys.executable
+
+ori_path = os.getcwd()
+os.chdir("ppocr/postprocess/pse_postprocess/pse")
+if (
+    subprocess.call("{} setup.py build_ext --inplace".format(python_path), shell=True)
+    != 0
+):
+    raise RuntimeError(
+        "Cannot compile pse: {}, if your system is windows, you need to install all the default components of `desktop development using C++` in visual studio 2019+".format(
+            os.path.dirname(os.path.realpath(__file__))
+        )
+    )
+os.chdir(ori_path)
+
+from .pse import pse

ocr/postprocess/pse_postprocess/pse/pse.pyx

@@ -0,0 +1,72 @@
+
+import cv2
+import numpy as np
+
+cimport cython
+cimport libcpp
+cimport libcpp.pair
+cimport libcpp.queue
+cimport numpy as np
+from libcpp.pair cimport *
+from libcpp.queue cimport *
+
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+cdef np.ndarray[np.int32_t, ndim=2] _pse(np.ndarray[np.uint8_t, ndim=3] kernels,
+                                         np.ndarray[np.int32_t, ndim=2] label,
+                                         int kernel_num,
+                                         int label_num,
+                                         float min_area=0):
+    cdef np.ndarray[np.int32_t, ndim=2] pred
+    pred = np.zeros((label.shape[0], label.shape[1]), dtype=np.int32)
+
+    for label_idx in range(1, label_num):
+        if np.sum(label == label_idx) < min_area:
+            label[label == label_idx] = 0
+
+    cdef libcpp.queue.queue[libcpp.pair.pair[np.int16_t,np.int16_t]] que = \
+        queue[libcpp.pair.pair[np.int16_t,np.int16_t]]()
+    cdef libcpp.queue.queue[libcpp.pair.pair[np.int16_t,np.int16_t]] nxt_que = \
+        queue[libcpp.pair.pair[np.int16_t,np.int16_t]]()
+    cdef np.int16_t* dx = [-1, 1, 0, 0]
+    cdef np.int16_t* dy = [0, 0, -1, 1]
+    cdef np.int16_t tmpx, tmpy
+
+    points = np.array(np.where(label > 0)).transpose((1, 0))
+    for point_idx in range(points.shape[0]):
+        tmpx, tmpy = points[point_idx, 0], points[point_idx, 1]
+        que.push(pair[np.int16_t,np.int16_t](tmpx, tmpy))
+        pred[tmpx, tmpy] = label[tmpx, tmpy]
+
+    cdef libcpp.pair.pair[np.int16_t,np.int16_t] cur
+    cdef int cur_label
+    for kernel_idx in range(kernel_num - 1, -1, -1):
+        while not que.empty():
+            cur = que.front()
+            que.pop()
+            cur_label = pred[cur.first, cur.second]
+
+            is_edge = True
+            for j in range(4):
+                tmpx = cur.first + dx[j]
+                tmpy = cur.second + dy[j]
+                if tmpx < 0 or tmpx >= label.shape[0] or tmpy < 0 or tmpy >= label.shape[1]:
+                    continue
+                if kernels[kernel_idx, tmpx, tmpy] == 0 or pred[tmpx, tmpy] > 0:
+                    continue
+
+                que.push(pair[np.int16_t,np.int16_t](tmpx, tmpy))
+                pred[tmpx, tmpy] = cur_label
+                is_edge = False
+            if is_edge:
+                nxt_que.push(cur)
+
+        que, nxt_que = nxt_que, que
+
+    return pred
+
+def pse(kernels, min_area):
+    kernel_num = kernels.shape[0]
+    label_num, label = cv2.connectedComponents(kernels[-1], connectivity=4)
+    return _pse(kernels[:-1], label, kernel_num, label_num, min_area)

ocr/postprocess/pse_postprocess/pse/setup.py

@@ -0,0 +1,19 @@
+from distutils.core import Extension, setup
+
+import numpy
+from Cython.Build import cythonize
+
+setup(
+    ext_modules=cythonize(
+        Extension(
+            "pse",
+            sources=["pse.pyx"],
+            language="c++",
+            include_dirs=[numpy.get_include()],
+            library_dirs=[],
+            libraries=[],
+            extra_compile_args=["-O3"],
+            extra_link_args=[],
+        )
+    )
+)

ocr/postprocess/pse_postprocess/pse_postprocess.py

@@ -0,0 +1,100 @@
+from __future__ import absolute_import, division, print_function
+
+import cv2
+import numpy as np
+import paddle
+from paddle.nn import functional as F
+
+from .pse import pse
+
+
+class PSEPostProcess(object):
+    """
+    The post process for PSE.
+    """
+
+    def __init__(
+        self,
+        thresh=0.5,
+        box_thresh=0.85,
+        min_area=16,
+        box_type="quad",
+        scale=4,
+        **kwargs
+    ):
+        assert box_type in ["quad", "poly"], "Only quad and poly is supported"
+        self.thresh = thresh
+        self.box_thresh = box_thresh
+        self.min_area = min_area
+        self.box_type = box_type
+        self.scale = scale
+
+    def __call__(self, outs_dict, shape_list):
+        pred = outs_dict["maps"]
+        if not isinstance(pred, paddle.Tensor):
+            pred = paddle.to_tensor(pred)
+        pred = F.interpolate(pred, scale_factor=4 // self.scale, mode="bilinear")
+
+        score = F.sigmoid(pred[:, 0, :, :])
+
+        kernels = (pred > self.thresh).astype("float32")
+        text_mask = kernels[:, 0, :, :]
+        kernels[:, 0:, :, :] = kernels[:, 0:, :, :] * text_mask
+
+        score = score.numpy()
+        kernels = kernels.numpy().astype(np.uint8)
+
+        boxes_batch = []
+        for batch_index in range(pred.shape[0]):
+            boxes, scores = self.boxes_from_bitmap(
+                score[batch_index], kernels[batch_index], shape_list[batch_index]
+            )
+
+            boxes_batch.append({"points": boxes, "scores": scores})
+        return boxes_batch
+
+    def boxes_from_bitmap(self, score, kernels, shape):
+        label = pse(kernels, self.min_area)
+        return self.generate_box(score, label, shape)
+
+    def generate_box(self, score, label, shape):
+        src_h, src_w, ratio_h, ratio_w = shape
+        label_num = np.max(label) + 1
+
+        boxes = []
+        scores = []
+        for i in range(1, label_num):
+            ind = label == i
+            points = np.array(np.where(ind)).transpose((1, 0))[:, ::-1]
+
+            if points.shape[0] < self.min_area:
+                label[ind] = 0
+                continue
+
+            score_i = np.mean(score[ind])
+            if score_i < self.box_thresh:
+                label[ind] = 0
+                continue
+
+            if self.box_type == "quad":
+                rect = cv2.minAreaRect(points)
+                bbox = cv2.boxPoints(rect)
+            elif self.box_type == "poly":
+                box_height = np.max(points[:, 1]) + 10
+                box_width = np.max(points[:, 0]) + 10
+
+                mask = np.zeros((box_height, box_width), np.uint8)
+                mask[points[:, 1], points[:, 0]] = 255
+
+                contours, _ = cv2.findContours(
+                    mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE
+                )
+                bbox = np.squeeze(contours[0], 1)
+            else:
+                raise NotImplementedError
+
+            bbox[:, 0] = np.clip(np.round(bbox[:, 0] / ratio_w), 0, src_w)
+            bbox[:, 1] = np.clip(np.round(bbox[:, 1] / ratio_h), 0, src_h)
+            boxes.append(bbox)
+            scores.append(score_i)
+        return boxes, scores

ocr/postprocess/rec_postprocess.py

@@ -0,0 +1,731 @@
+import re
+
+import numpy as np
+import paddle
+from paddle.nn import functional as F
+
+
+class BaseRecLabelDecode(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False):
+        self.beg_str = "sos"
+        self.end_str = "eos"
+
+        self.character_str = []
+        if character_dict_path is None:
+            self.character_str = "0123456789abcdefghijklmnopqrstuvwxyz"
+            dict_character = list(self.character_str)
+        else:
+            with open(character_dict_path, "rb") as fin:
+                lines = fin.readlines()
+                for line in lines:
+                    line = line.decode("utf-8").strip("\n").strip("\r\n")
+                    self.character_str.append(line)
+            if use_space_char:
+                self.character_str.append(" ")
+            dict_character = list(self.character_str)
+
+        dict_character = self.add_special_char(dict_character)
+        self.dict = {}
+        for i, char in enumerate(dict_character):
+            self.dict[char] = i
+        self.character = dict_character
+
+    def add_special_char(self, dict_character):
+        return dict_character
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        ignored_tokens = self.get_ignored_tokens()
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            selection = np.ones(len(text_index[batch_idx]), dtype=bool)
+            if is_remove_duplicate:
+                selection[1:] = text_index[batch_idx][1:] != text_index[batch_idx][:-1]
+            for ignored_token in ignored_tokens:
+                selection &= text_index[batch_idx] != ignored_token
+
+            char_list = [
+                self.character[text_id] for text_id in text_index[batch_idx][selection]
+            ]
+            if text_prob is not None:
+                conf_list = text_prob[batch_idx][selection]
+            else:
+                conf_list = [1] * len(selection)
+            if len(conf_list) == 0:
+                conf_list = [0]
+
+            text = "".join(char_list)
+            result_list.append((text, np.mean(conf_list).tolist()))
+        return result_list
+
+    def get_ignored_tokens(self):
+        return [0]  # for ctc blank
+
+
+class CTCLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(CTCLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        if isinstance(preds, tuple) or isinstance(preds, list):
+            preds = preds[-1]
+        if isinstance(preds, paddle.Tensor):
+            preds = preds.numpy()
+        preds_idx = preds.argmax(axis=2)
+        preds_prob = preds.max(axis=2)
+        text = self.decode(preds_idx, preds_prob, is_remove_duplicate=True)
+        if label is None:
+            return text
+        label = self.decode(label)
+        return text, label
+
+    def add_special_char(self, dict_character):
+        dict_character = ["blank"] + dict_character
+        return dict_character
+
+
+class DistillationCTCLabelDecode(CTCLabelDecode):
+    """
+    Convert
+    Convert between text-label and text-index
+    """
+
+    def __init__(
+        self,
+        character_dict_path=None,
+        use_space_char=False,
+        model_name=["student"],
+        key=None,
+        multi_head=False,
+        **kwargs
+    ):
+        super(DistillationCTCLabelDecode, self).__init__(
+            character_dict_path, use_space_char
+        )
+        if not isinstance(model_name, list):
+            model_name = [model_name]
+        self.model_name = model_name
+
+        self.key = key
+        self.multi_head = multi_head
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        output = dict()
+        for name in self.model_name:
+            pred = preds[name]
+            if self.key is not None:
+                pred = pred[self.key]
+            if self.multi_head and isinstance(pred, dict):
+                pred = pred["ctc"]
+            output[name] = super().__call__(pred, label=label, *args, **kwargs)
+        return output
+
+
+class NRTRLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=True, **kwargs):
+        super(NRTRLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+
+        if len(preds) == 2:
+            preds_id = preds[0]
+            preds_prob = preds[1]
+            if isinstance(preds_id, paddle.Tensor):
+                preds_id = preds_id.numpy()
+            if isinstance(preds_prob, paddle.Tensor):
+                preds_prob = preds_prob.numpy()
+            if preds_id[0][0] == 2:
+                preds_idx = preds_id[:, 1:]
+                preds_prob = preds_prob[:, 1:]
+            else:
+                preds_idx = preds_id
+            text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+            if label is None:
+                return text
+            label = self.decode(label[:, 1:])
+        else:
+            if isinstance(preds, paddle.Tensor):
+                preds = preds.numpy()
+            preds_idx = preds.argmax(axis=2)
+            preds_prob = preds.max(axis=2)
+            text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+            if label is None:
+                return text
+            label = self.decode(label[:, 1:])
+        return text, label
+
+    def add_special_char(self, dict_character):
+        dict_character = ["blank", "<unk>", "<s>", "</s>"] + dict_character
+        return dict_character
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if text_index[batch_idx][idx] == 3:  # end
+                    break
+                try:
+                    char_list.append(self.character[int(text_index[batch_idx][idx])])
+                except:
+                    continue
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+            text = "".join(char_list)
+            result_list.append((text.lower(), np.mean(conf_list).tolist()))
+        return result_list
+
+
+class AttnLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(AttnLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+    def add_special_char(self, dict_character):
+        self.beg_str = "sos"
+        self.end_str = "eos"
+        dict_character = dict_character
+        dict_character = [self.beg_str] + dict_character + [self.end_str]
+        return dict_character
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        ignored_tokens = self.get_ignored_tokens()
+        [beg_idx, end_idx] = self.get_ignored_tokens()
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if text_index[batch_idx][idx] in ignored_tokens:
+                    continue
+                if int(text_index[batch_idx][idx]) == int(end_idx):
+                    break
+                if is_remove_duplicate:
+                    # only for predict
+                    if (
+                        idx > 0
+                        and text_index[batch_idx][idx - 1] == text_index[batch_idx][idx]
+                    ):
+                        continue
+                char_list.append(self.character[int(text_index[batch_idx][idx])])
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+            text = "".join(char_list)
+            result_list.append((text, np.mean(conf_list).tolist()))
+        return result_list
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        """
+        text = self.decode(text)
+        if label is None:
+            return text
+        else:
+            label = self.decode(label, is_remove_duplicate=False)
+            return text, label
+        """
+        if isinstance(preds, paddle.Tensor):
+            preds = preds.numpy()
+
+        preds_idx = preds.argmax(axis=2)
+        preds_prob = preds.max(axis=2)
+        text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+        if label is None:
+            return text
+        label = self.decode(label, is_remove_duplicate=False)
+        return text, label
+
+    def get_ignored_tokens(self):
+        beg_idx = self.get_beg_end_flag_idx("beg")
+        end_idx = self.get_beg_end_flag_idx("end")
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end):
+        if beg_or_end == "beg":
+            idx = np.array(self.dict[self.beg_str])
+        elif beg_or_end == "end":
+            idx = np.array(self.dict[self.end_str])
+        else:
+            assert False, "unsupport type %s in get_beg_end_flag_idx" % beg_or_end
+        return idx
+
+
+class SEEDLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(SEEDLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+    def add_special_char(self, dict_character):
+        self.padding_str = "padding"
+        self.end_str = "eos"
+        self.unknown = "unknown"
+        dict_character = dict_character + [self.end_str, self.padding_str, self.unknown]
+        return dict_character
+
+    def get_ignored_tokens(self):
+        end_idx = self.get_beg_end_flag_idx("eos")
+        return [end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end):
+        if beg_or_end == "sos":
+            idx = np.array(self.dict[self.beg_str])
+        elif beg_or_end == "eos":
+            idx = np.array(self.dict[self.end_str])
+        else:
+            assert False, "unsupport type %s in get_beg_end_flag_idx" % beg_or_end
+        return idx
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        [end_idx] = self.get_ignored_tokens()
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if int(text_index[batch_idx][idx]) == int(end_idx):
+                    break
+                if is_remove_duplicate:
+                    # only for predict
+                    if (
+                        idx > 0
+                        and text_index[batch_idx][idx - 1] == text_index[batch_idx][idx]
+                    ):
+                        continue
+                char_list.append(self.character[int(text_index[batch_idx][idx])])
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+            text = "".join(char_list)
+            result_list.append((text, np.mean(conf_list).tolist()))
+        return result_list
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        """
+        text = self.decode(text)
+        if label is None:
+            return text
+        else:
+            label = self.decode(label, is_remove_duplicate=False)
+            return text, label
+        """
+        preds_idx = preds["rec_pred"]
+        if isinstance(preds_idx, paddle.Tensor):
+            preds_idx = preds_idx.numpy()
+        if "rec_pred_scores" in preds:
+            preds_idx = preds["rec_pred"]
+            preds_prob = preds["rec_pred_scores"]
+        else:
+            preds_idx = preds["rec_pred"].argmax(axis=2)
+            preds_prob = preds["rec_pred"].max(axis=2)
+        text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+        if label is None:
+            return text
+        label = self.decode(label, is_remove_duplicate=False)
+        return text, label
+
+
+class SRNLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(SRNLabelDecode, self).__init__(character_dict_path, use_space_char)
+        self.max_text_length = kwargs.get("max_text_length", 25)
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        pred = preds["predict"]
+        char_num = len(self.character_str) + 2
+        if isinstance(pred, paddle.Tensor):
+            pred = pred.numpy()
+        pred = np.reshape(pred, [-1, char_num])
+
+        preds_idx = np.argmax(pred, axis=1)
+        preds_prob = np.max(pred, axis=1)
+
+        preds_idx = np.reshape(preds_idx, [-1, self.max_text_length])
+
+        preds_prob = np.reshape(preds_prob, [-1, self.max_text_length])
+
+        text = self.decode(preds_idx, preds_prob)
+
+        if label is None:
+            text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+            return text
+        label = self.decode(label)
+        return text, label
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        ignored_tokens = self.get_ignored_tokens()
+        batch_size = len(text_index)
+
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if text_index[batch_idx][idx] in ignored_tokens:
+                    continue
+                if is_remove_duplicate:
+                    # only for predict
+                    if (
+                        idx > 0
+                        and text_index[batch_idx][idx - 1] == text_index[batch_idx][idx]
+                    ):
+                        continue
+                char_list.append(self.character[int(text_index[batch_idx][idx])])
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+
+            text = "".join(char_list)
+            result_list.append((text, np.mean(conf_list).tolist()))
+        return result_list
+
+    def add_special_char(self, dict_character):
+        dict_character = dict_character + [self.beg_str, self.end_str]
+        return dict_character
+
+    def get_ignored_tokens(self):
+        beg_idx = self.get_beg_end_flag_idx("beg")
+        end_idx = self.get_beg_end_flag_idx("end")
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end):
+        if beg_or_end == "beg":
+            idx = np.array(self.dict[self.beg_str])
+        elif beg_or_end == "end":
+            idx = np.array(self.dict[self.end_str])
+        else:
+            assert False, "unsupport type %s in get_beg_end_flag_idx" % beg_or_end
+        return idx
+
+
+class TableLabelDecode(object):
+    """ """
+
+    def __init__(self, character_dict_path, **kwargs):
+        list_character, list_elem = self.load_char_elem_dict(character_dict_path)
+        list_character = self.add_special_char(list_character)
+        list_elem = self.add_special_char(list_elem)
+        self.dict_character = {}
+        self.dict_idx_character = {}
+        for i, char in enumerate(list_character):
+            self.dict_idx_character[i] = char
+            self.dict_character[char] = i
+        self.dict_elem = {}
+        self.dict_idx_elem = {}
+        for i, elem in enumerate(list_elem):
+            self.dict_idx_elem[i] = elem
+            self.dict_elem[elem] = i
+
+    def load_char_elem_dict(self, character_dict_path):
+        list_character = []
+        list_elem = []
+        with open(character_dict_path, "rb") as fin:
+            lines = fin.readlines()
+            substr = lines[0].decode("utf-8").strip("\n").strip("\r\n").split("\t")
+            character_num = int(substr[0])
+            elem_num = int(substr[1])
+            for cno in range(1, 1 + character_num):
+                character = lines[cno].decode("utf-8").strip("\n").strip("\r\n")
+                list_character.append(character)
+            for eno in range(1 + character_num, 1 + character_num + elem_num):
+                elem = lines[eno].decode("utf-8").strip("\n").strip("\r\n")
+                list_elem.append(elem)
+        return list_character, list_elem
+
+    def add_special_char(self, list_character):
+        self.beg_str = "sos"
+        self.end_str = "eos"
+        list_character = [self.beg_str] + list_character + [self.end_str]
+        return list_character
+
+    def __call__(self, preds):
+        structure_probs = preds["structure_probs"]
+        loc_preds = preds["loc_preds"]
+        if isinstance(structure_probs, paddle.Tensor):
+            structure_probs = structure_probs.numpy()
+        if isinstance(loc_preds, paddle.Tensor):
+            loc_preds = loc_preds.numpy()
+        structure_idx = structure_probs.argmax(axis=2)
+        structure_probs = structure_probs.max(axis=2)
+        (
+            structure_str,
+            structure_pos,
+            result_score_list,
+            result_elem_idx_list,
+        ) = self.decode(structure_idx, structure_probs, "elem")
+        res_html_code_list = []
+        res_loc_list = []
+        batch_num = len(structure_str)
+        for bno in range(batch_num):
+            res_loc = []
+            for sno in range(len(structure_str[bno])):
+                text = structure_str[bno][sno]
+                if text in ["<td>", "<td"]:
+                    pos = structure_pos[bno][sno]
+                    res_loc.append(loc_preds[bno, pos])
+            res_html_code = "".join(structure_str[bno])
+            res_loc = np.array(res_loc)
+            res_html_code_list.append(res_html_code)
+            res_loc_list.append(res_loc)
+        return {
+            "res_html_code": res_html_code_list,
+            "res_loc": res_loc_list,
+            "res_score_list": result_score_list,
+            "res_elem_idx_list": result_elem_idx_list,
+            "structure_str_list": structure_str,
+        }
+
+    def decode(self, text_index, structure_probs, char_or_elem):
+        """convert text-label into text-index."""
+        if char_or_elem == "char":
+            current_dict = self.dict_idx_character
+        else:
+            current_dict = self.dict_idx_elem
+            ignored_tokens = self.get_ignored_tokens("elem")
+            beg_idx, end_idx = ignored_tokens
+
+        result_list = []
+        result_pos_list = []
+        result_score_list = []
+        result_elem_idx_list = []
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            char_list = []
+            elem_pos_list = []
+            elem_idx_list = []
+            score_list = []
+            for idx in range(len(text_index[batch_idx])):
+                tmp_elem_idx = int(text_index[batch_idx][idx])
+                if idx > 0 and tmp_elem_idx == end_idx:
+                    break
+                if tmp_elem_idx in ignored_tokens:
+                    continue
+
+                char_list.append(current_dict[tmp_elem_idx])
+                elem_pos_list.append(idx)
+                score_list.append(structure_probs[batch_idx, idx])
+                elem_idx_list.append(tmp_elem_idx)
+            result_list.append(char_list)
+            result_pos_list.append(elem_pos_list)
+            result_score_list.append(score_list)
+            result_elem_idx_list.append(elem_idx_list)
+        return result_list, result_pos_list, result_score_list, result_elem_idx_list
+
+    def get_ignored_tokens(self, char_or_elem):
+        beg_idx = self.get_beg_end_flag_idx("beg", char_or_elem)
+        end_idx = self.get_beg_end_flag_idx("end", char_or_elem)
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end, char_or_elem):
+        if char_or_elem == "char":
+            if beg_or_end == "beg":
+                idx = self.dict_character[self.beg_str]
+            elif beg_or_end == "end":
+                idx = self.dict_character[self.end_str]
+            else:
+                assert False, (
+                    "Unsupport type %s in get_beg_end_flag_idx of char" % beg_or_end
+                )
+        elif char_or_elem == "elem":
+            if beg_or_end == "beg":
+                idx = self.dict_elem[self.beg_str]
+            elif beg_or_end == "end":
+                idx = self.dict_elem[self.end_str]
+            else:
+                assert False, (
+                    "Unsupport type %s in get_beg_end_flag_idx of elem" % beg_or_end
+                )
+        else:
+            assert False, "Unsupport type %s in char_or_elem" % char_or_elem
+        return idx
+
+
+class SARLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(SARLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+        self.rm_symbol = kwargs.get("rm_symbol", False)
+
+    def add_special_char(self, dict_character):
+        beg_end_str = "<BOS/EOS>"
+        unknown_str = "<UKN>"
+        padding_str = "<PAD>"
+        dict_character = dict_character + [unknown_str]
+        self.unknown_idx = len(dict_character) - 1
+        dict_character = dict_character + [beg_end_str]
+        self.start_idx = len(dict_character) - 1
+        self.end_idx = len(dict_character) - 1
+        dict_character = dict_character + [padding_str]
+        self.padding_idx = len(dict_character) - 1
+        return dict_character
+
+    def decode(self, text_index, text_prob=None, is_remove_duplicate=False):
+        """convert text-index into text-label."""
+        result_list = []
+        ignored_tokens = self.get_ignored_tokens()
+
+        batch_size = len(text_index)
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if text_index[batch_idx][idx] in ignored_tokens:
+                    continue
+                if int(text_index[batch_idx][idx]) == int(self.end_idx):
+                    if text_prob is None and idx == 0:
+                        continue
+                    else:
+                        break
+                if is_remove_duplicate:
+                    # only for predict
+                    if (
+                        idx > 0
+                        and text_index[batch_idx][idx - 1] == text_index[batch_idx][idx]
+                    ):
+                        continue
+                char_list.append(self.character[int(text_index[batch_idx][idx])])
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+            text = "".join(char_list)
+            if self.rm_symbol:
+                comp = re.compile("[^A-Z^a-z^0-9^\u4e00-\u9fa5]")
+                text = text.lower()
+                text = comp.sub("", text)
+            result_list.append((text, np.mean(conf_list).tolist()))
+        return result_list
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        if isinstance(preds, paddle.Tensor):
+            preds = preds.numpy()
+        preds_idx = preds.argmax(axis=2)
+        preds_prob = preds.max(axis=2)
+
+        text = self.decode(preds_idx, preds_prob, is_remove_duplicate=False)
+
+        if label is None:
+            return text
+        label = self.decode(label, is_remove_duplicate=False)
+        return text, label
+
+    def get_ignored_tokens(self):
+        return [self.padding_idx]
+
+
+class DistillationSARLabelDecode(SARLabelDecode):
+    """
+    Convert
+    Convert between text-label and text-index
+    """
+
+    def __init__(
+        self,
+        character_dict_path=None,
+        use_space_char=False,
+        model_name=["student"],
+        key=None,
+        multi_head=False,
+        **kwargs
+    ):
+        super(DistillationSARLabelDecode, self).__init__(
+            character_dict_path, use_space_char
+        )
+        if not isinstance(model_name, list):
+            model_name = [model_name]
+        self.model_name = model_name
+
+        self.key = key
+        self.multi_head = multi_head
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        output = dict()
+        for name in self.model_name:
+            pred = preds[name]
+            if self.key is not None:
+                pred = pred[self.key]
+            if self.multi_head and isinstance(pred, dict):
+                pred = pred["sar"]
+            output[name] = super().__call__(pred, label=label, *args, **kwargs)
+        return output
+
+
+class PRENLabelDecode(BaseRecLabelDecode):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, character_dict_path=None, use_space_char=False, **kwargs):
+        super(PRENLabelDecode, self).__init__(character_dict_path, use_space_char)
+
+    def add_special_char(self, dict_character):
+        padding_str = "<PAD>"  # 0
+        end_str = "<EOS>"  # 1
+        unknown_str = "<UNK>"  # 2
+
+        dict_character = [padding_str, end_str, unknown_str] + dict_character
+        self.padding_idx = 0
+        self.end_idx = 1
+        self.unknown_idx = 2
+
+        return dict_character
+
+    def decode(self, text_index, text_prob=None):
+        """convert text-index into text-label."""
+        result_list = []
+        batch_size = len(text_index)
+
+        for batch_idx in range(batch_size):
+            char_list = []
+            conf_list = []
+            for idx in range(len(text_index[batch_idx])):
+                if text_index[batch_idx][idx] == self.end_idx:
+                    break
+                if text_index[batch_idx][idx] in [self.padding_idx, self.unknown_idx]:
+                    continue
+                char_list.append(self.character[int(text_index[batch_idx][idx])])
+                if text_prob is not None:
+                    conf_list.append(text_prob[batch_idx][idx])
+                else:
+                    conf_list.append(1)
+
+            text = "".join(char_list)
+            if len(text) > 0:
+                result_list.append((text, np.mean(conf_list).tolist()))
+            else:
+                # here confidence of empty recog result is 1
+                result_list.append(("", 1))
+        return result_list
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        preds = preds.numpy()
+        preds_idx = preds.argmax(axis=2)
+        preds_prob = preds.max(axis=2)
+        text = self.decode(preds_idx, preds_prob)
+        if label is None:
+            return text
+        label = self.decode(label)
+        return text, label

ocr/postprocess/sast_postprocess.py

@@ -0,0 +1,355 @@
+from __future__ import absolute_import, division, print_function
+
+import os
+import sys
+
+__dir__ = os.path.dirname(__file__)
+sys.path.append(__dir__)
+sys.path.append(os.path.join(__dir__, ".."))
+
+import time
+
+import cv2
+import numpy as np
+import paddle
+
+from .locality_aware_nms import nms_locality
+
+
+class SASTPostProcess(object):
+    """
+    The post process for SAST.
+    """
+
+    def __init__(
+        self,
+        score_thresh=0.5,
+        nms_thresh=0.2,
+        sample_pts_num=2,
+        shrink_ratio_of_width=0.3,
+        expand_scale=1.0,
+        tcl_map_thresh=0.5,
+        **kwargs
+    ):
+
+        self.score_thresh = score_thresh
+        self.nms_thresh = nms_thresh
+        self.sample_pts_num = sample_pts_num
+        self.shrink_ratio_of_width = shrink_ratio_of_width
+        self.expand_scale = expand_scale
+        self.tcl_map_thresh = tcl_map_thresh
+
+        # c++ la-nms is faster, but only support python 3.5
+        self.is_python35 = False
+        if sys.version_info.major == 3 and sys.version_info.minor == 5:
+            self.is_python35 = True
+
+    def point_pair2poly(self, point_pair_list):
+        """
+        Transfer vertical point_pairs into poly point in clockwise.
+        """
+        # constract poly
+        point_num = len(point_pair_list) * 2
+        point_list = [0] * point_num
+        for idx, point_pair in enumerate(point_pair_list):
+            point_list[idx] = point_pair[0]
+            point_list[point_num - 1 - idx] = point_pair[1]
+        return np.array(point_list).reshape(-1, 2)
+
+    def shrink_quad_along_width(self, quad, begin_width_ratio=0.0, end_width_ratio=1.0):
+        """
+        Generate shrink_quad_along_width.
+        """
+        ratio_pair = np.array(
+            [[begin_width_ratio], [end_width_ratio]], dtype=np.float32
+        )
+        p0_1 = quad[0] + (quad[1] - quad[0]) * ratio_pair
+        p3_2 = quad[3] + (quad[2] - quad[3]) * ratio_pair
+        return np.array([p0_1[0], p0_1[1], p3_2[1], p3_2[0]])
+
+    def expand_poly_along_width(self, poly, shrink_ratio_of_width=0.3):
+        """
+        expand poly along width.
+        """
+        point_num = poly.shape[0]
+        left_quad = np.array([poly[0], poly[1], poly[-2], poly[-1]], dtype=np.float32)
+        left_ratio = (
+            -shrink_ratio_of_width
+            * np.linalg.norm(left_quad[0] - left_quad[3])
+            / (np.linalg.norm(left_quad[0] - left_quad[1]) + 1e-6)
+        )
+        left_quad_expand = self.shrink_quad_along_width(left_quad, left_ratio, 1.0)
+        right_quad = np.array(
+            [
+                poly[point_num // 2 - 2],
+                poly[point_num // 2 - 1],
+                poly[point_num // 2],
+                poly[point_num // 2 + 1],
+            ],
+            dtype=np.float32,
+        )
+        right_ratio = 1.0 + shrink_ratio_of_width * np.linalg.norm(
+            right_quad[0] - right_quad[3]
+        ) / (np.linalg.norm(right_quad[0] - right_quad[1]) + 1e-6)
+        right_quad_expand = self.shrink_quad_along_width(right_quad, 0.0, right_ratio)
+        poly[0] = left_quad_expand[0]
+        poly[-1] = left_quad_expand[-1]
+        poly[point_num // 2 - 1] = right_quad_expand[1]
+        poly[point_num // 2] = right_quad_expand[2]
+        return poly
+
+    def restore_quad(self, tcl_map, tcl_map_thresh, tvo_map):
+        """Restore quad."""
+        xy_text = np.argwhere(tcl_map[:, :, 0] > tcl_map_thresh)
+        xy_text = xy_text[:, ::-1]  # (n, 2)
+
+        # Sort the text boxes via the y axis
+        xy_text = xy_text[np.argsort(xy_text[:, 1])]
+
+        scores = tcl_map[xy_text[:, 1], xy_text[:, 0], 0]
+        scores = scores[:, np.newaxis]
+
+        # Restore
+        point_num = int(tvo_map.shape[-1] / 2)
+        assert point_num == 4
+        tvo_map = tvo_map[xy_text[:, 1], xy_text[:, 0], :]
+        xy_text_tile = np.tile(xy_text, (1, point_num))  # (n, point_num * 2)
+        quads = xy_text_tile - tvo_map
+
+        return scores, quads, xy_text
+
+    def quad_area(self, quad):
+        """
+        compute area of a quad.
+        """
+        edge = [
+            (quad[1][0] - quad[0][0]) * (quad[1][1] + quad[0][1]),
+            (quad[2][0] - quad[1][0]) * (quad[2][1] + quad[1][1]),
+            (quad[3][0] - quad[2][0]) * (quad[3][1] + quad[2][1]),
+            (quad[0][0] - quad[3][0]) * (quad[0][1] + quad[3][1]),
+        ]
+        return np.sum(edge) / 2.0
+
+    def nms(self, dets):
+        if self.is_python35:
+            import lanms
+
+            dets = lanms.merge_quadrangle_n9(dets, self.nms_thresh)
+        else:
+            dets = nms_locality(dets, self.nms_thresh)
+        return dets
+
+    def cluster_by_quads_tco(self, tcl_map, tcl_map_thresh, quads, tco_map):
+        """
+        Cluster pixels in tcl_map based on quads.
+        """
+        instance_count = quads.shape[0] + 1  # contain background
+        instance_label_map = np.zeros(tcl_map.shape[:2], dtype=np.int32)
+        if instance_count == 1:
+            return instance_count, instance_label_map
+
+        # predict text center
+        xy_text = np.argwhere(tcl_map[:, :, 0] > tcl_map_thresh)
+        n = xy_text.shape[0]
+        xy_text = xy_text[:, ::-1]  # (n, 2)
+        tco = tco_map[xy_text[:, 1], xy_text[:, 0], :]  # (n, 2)
+        pred_tc = xy_text - tco
+
+        # get gt text center
+        m = quads.shape[0]
+        gt_tc = np.mean(quads, axis=1)  # (m, 2)
+
+        pred_tc_tile = np.tile(pred_tc[:, np.newaxis, :], (1, m, 1))  # (n, m, 2)
+        gt_tc_tile = np.tile(gt_tc[np.newaxis, :, :], (n, 1, 1))  # (n, m, 2)
+        dist_mat = np.linalg.norm(pred_tc_tile - gt_tc_tile, axis=2)  # (n, m)
+        xy_text_assign = np.argmin(dist_mat, axis=1) + 1  # (n,)
+
+        instance_label_map[xy_text[:, 1], xy_text[:, 0]] = xy_text_assign
+        return instance_count, instance_label_map
+
+    def estimate_sample_pts_num(self, quad, xy_text):
+        """
+        Estimate sample points number.
+        """
+        eh = (
+            np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(quad[1] - quad[2])
+        ) / 2.0
+        ew = (
+            np.linalg.norm(quad[0] - quad[1]) + np.linalg.norm(quad[2] - quad[3])
+        ) / 2.0
+
+        dense_sample_pts_num = max(2, int(ew))
+        dense_xy_center_line = xy_text[
+            np.linspace(
+                0,
+                xy_text.shape[0] - 1,
+                dense_sample_pts_num,
+                endpoint=True,
+                dtype=np.float32,
+            ).astype(np.int32)
+        ]
+
+        dense_xy_center_line_diff = dense_xy_center_line[1:] - dense_xy_center_line[:-1]
+        estimate_arc_len = np.sum(np.linalg.norm(dense_xy_center_line_diff, axis=1))
+
+        sample_pts_num = max(2, int(estimate_arc_len / eh))
+        return sample_pts_num
+
+    def detect_sast(
+        self,
+        tcl_map,
+        tvo_map,
+        tbo_map,
+        tco_map,
+        ratio_w,
+        ratio_h,
+        src_w,
+        src_h,
+        shrink_ratio_of_width=0.3,
+        tcl_map_thresh=0.5,
+        offset_expand=1.0,
+        out_strid=4.0,
+    ):
+        """
+        first resize the tcl_map, tvo_map and tbo_map to the input_size, then restore the polys
+        """
+        # restore quad
+        scores, quads, xy_text = self.restore_quad(tcl_map, tcl_map_thresh, tvo_map)
+        dets = np.hstack((quads, scores)).astype(np.float32, copy=False)
+        dets = self.nms(dets)
+        if dets.shape[0] == 0:
+            return []
+        quads = dets[:, :-1].reshape(-1, 4, 2)
+
+        # Compute quad area
+        quad_areas = []
+        for quad in quads:
+            quad_areas.append(-self.quad_area(quad))
+
+        # instance segmentation
+        # instance_count, instance_label_map = cv2.connectedComponents(tcl_map.astype(np.uint8), connectivity=8)
+        instance_count, instance_label_map = self.cluster_by_quads_tco(
+            tcl_map, tcl_map_thresh, quads, tco_map
+        )
+
+        # restore single poly with tcl instance.
+        poly_list = []
+        for instance_idx in range(1, instance_count):
+            xy_text = np.argwhere(instance_label_map == instance_idx)[:, ::-1]
+            quad = quads[instance_idx - 1]
+            q_area = quad_areas[instance_idx - 1]
+            if q_area < 5:
+                continue
+
+            #
+            len1 = float(np.linalg.norm(quad[0] - quad[1]))
+            len2 = float(np.linalg.norm(quad[1] - quad[2]))
+            min_len = min(len1, len2)
+            if min_len < 3:
+                continue
+
+            # filter small CC
+            if xy_text.shape[0] <= 0:
+                continue
+
+            # filter low confidence instance
+            xy_text_scores = tcl_map[xy_text[:, 1], xy_text[:, 0], 0]
+            if np.sum(xy_text_scores) / quad_areas[instance_idx - 1] < 0.1:
+                # if np.sum(xy_text_scores) / quad_areas[instance_idx - 1] < 0.05:
+                continue
+
+            # sort xy_text
+            left_center_pt = np.array(
+                [[(quad[0, 0] + quad[-1, 0]) / 2.0, (quad[0, 1] + quad[-1, 1]) / 2.0]]
+            )  # (1, 2)
+            right_center_pt = np.array(
+                [[(quad[1, 0] + quad[2, 0]) / 2.0, (quad[1, 1] + quad[2, 1]) / 2.0]]
+            )  # (1, 2)
+            proj_unit_vec = (right_center_pt - left_center_pt) / (
+                np.linalg.norm(right_center_pt - left_center_pt) + 1e-6
+            )
+            proj_value = np.sum(xy_text * proj_unit_vec, axis=1)
+            xy_text = xy_text[np.argsort(proj_value)]
+
+            # Sample pts in tcl map
+            if self.sample_pts_num == 0:
+                sample_pts_num = self.estimate_sample_pts_num(quad, xy_text)
+            else:
+                sample_pts_num = self.sample_pts_num
+            xy_center_line = xy_text[
+                np.linspace(
+                    0,
+                    xy_text.shape[0] - 1,
+                    sample_pts_num,
+                    endpoint=True,
+                    dtype=np.float32,
+                ).astype(np.int32)
+            ]
+
+            point_pair_list = []
+            for x, y in xy_center_line:
+                # get corresponding offset
+                offset = tbo_map[y, x, :].reshape(2, 2)
+                if offset_expand != 1.0:
+                    offset_length = np.linalg.norm(offset, axis=1, keepdims=True)
+                    expand_length = np.clip(
+                        offset_length * (offset_expand - 1), a_min=0.5, a_max=3.0
+                    )
+                    offset_detal = offset / offset_length * expand_length
+                    offset = offset + offset_detal
+                    # original point
+                ori_yx = np.array([y, x], dtype=np.float32)
+                point_pair = (
+                    (ori_yx + offset)[:, ::-1]
+                    * out_strid
+                    / np.array([ratio_w, ratio_h]).reshape(-1, 2)
+                )
+                point_pair_list.append(point_pair)
+
+            # ndarry: (x, 2), expand poly along width
+            detected_poly = self.point_pair2poly(point_pair_list)
+            detected_poly = self.expand_poly_along_width(
+                detected_poly, shrink_ratio_of_width
+            )
+            detected_poly[:, 0] = np.clip(detected_poly[:, 0], a_min=0, a_max=src_w)
+            detected_poly[:, 1] = np.clip(detected_poly[:, 1], a_min=0, a_max=src_h)
+            poly_list.append(detected_poly)
+
+        return poly_list
+
+    def __call__(self, outs_dict, shape_list):
+        score_list = outs_dict["f_score"]
+        border_list = outs_dict["f_border"]
+        tvo_list = outs_dict["f_tvo"]
+        tco_list = outs_dict["f_tco"]
+        if isinstance(score_list, paddle.Tensor):
+            score_list = score_list.numpy()
+            border_list = border_list.numpy()
+            tvo_list = tvo_list.numpy()
+            tco_list = tco_list.numpy()
+
+        img_num = len(shape_list)
+        poly_lists = []
+        for ino in range(img_num):
+            p_score = score_list[ino].transpose((1, 2, 0))
+            p_border = border_list[ino].transpose((1, 2, 0))
+            p_tvo = tvo_list[ino].transpose((1, 2, 0))
+            p_tco = tco_list[ino].transpose((1, 2, 0))
+            src_h, src_w, ratio_h, ratio_w = shape_list[ino]
+
+            poly_list = self.detect_sast(
+                p_score,
+                p_tvo,
+                p_border,
+                p_tco,
+                ratio_w,
+                ratio_h,
+                src_w,
+                src_h,
+                shrink_ratio_of_width=self.shrink_ratio_of_width,
+                tcl_map_thresh=self.tcl_map_thresh,
+                offset_expand=self.expand_scale,
+            )
+            poly_lists.append({"points": np.array(poly_list)})
+
+        return poly_lists

ocr/postprocess/vqa_token_re_layoutlm_postprocess.py

@@ -0,0 +1,36 @@
+class VQAReTokenLayoutLMPostProcess(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, **kwargs):
+        super(VQAReTokenLayoutLMPostProcess, self).__init__()
+
+    def __call__(self, preds, label=None, *args, **kwargs):
+        if label is not None:
+            return self._metric(preds, label)
+        else:
+            return self._infer(preds, *args, **kwargs)
+
+    def _metric(self, preds, label):
+        return preds["pred_relations"], label[6], label[5]
+
+    def _infer(self, preds, *args, **kwargs):
+        ser_results = kwargs["ser_results"]
+        entity_idx_dict_batch = kwargs["entity_idx_dict_batch"]
+        pred_relations = preds["pred_relations"]
+
+        # merge relations and ocr info
+        results = []
+        for pred_relation, ser_result, entity_idx_dict in zip(
+            pred_relations, ser_results, entity_idx_dict_batch
+        ):
+            result = []
+            used_tail_id = []
+            for relation in pred_relation:
+                if relation["tail_id"] in used_tail_id:
+                    continue
+                used_tail_id.append(relation["tail_id"])
+                ocr_info_head = ser_result[entity_idx_dict[relation["head_id"]]]
+                ocr_info_tail = ser_result[entity_idx_dict[relation["tail_id"]]]
+                result.append((ocr_info_head, ocr_info_tail))
+            results.append(result)
+        return results

ocr/postprocess/vqa_token_ser_layoutlm_postprocess.py

@@ -0,0 +1,96 @@
+import numpy as np
+import paddle
+
+
+def load_vqa_bio_label_maps(label_map_path):
+    with open(label_map_path, "r", encoding="utf-8") as fin:
+        lines = fin.readlines()
+    lines = [line.strip() for line in lines]
+    if "O" not in lines:
+        lines.insert(0, "O")
+    labels = []
+    for line in lines:
+        if line == "O":
+            labels.append("O")
+        else:
+            labels.append("B-" + line)
+            labels.append("I-" + line)
+    label2id_map = {label: idx for idx, label in enumerate(labels)}
+    id2label_map = {idx: label for idx, label in enumerate(labels)}
+    return label2id_map, id2label_map
+
+
+class VQASerTokenLayoutLMPostProcess(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, class_path, **kwargs):
+        super(VQASerTokenLayoutLMPostProcess, self).__init__()
+        label2id_map, self.id2label_map = load_vqa_bio_label_maps(class_path)
+
+        self.label2id_map_for_draw = dict()
+        for key in label2id_map:
+            if key.startswith("I-"):
+                self.label2id_map_for_draw[key] = label2id_map["B" + key[1:]]
+            else:
+                self.label2id_map_for_draw[key] = label2id_map[key]
+
+        self.id2label_map_for_show = dict()
+        for key in self.label2id_map_for_draw:
+            val = self.label2id_map_for_draw[key]
+            if key == "O":
+                self.id2label_map_for_show[val] = key
+            if key.startswith("B-") or key.startswith("I-"):
+                self.id2label_map_for_show[val] = key[2:]
+            else:
+                self.id2label_map_for_show[val] = key
+
+    def __call__(self, preds, batch=None, *args, **kwargs):
+        if isinstance(preds, paddle.Tensor):
+            preds = preds.numpy()
+
+        if batch is not None:
+            return self._metric(preds, batch[1])
+        else:
+            return self._infer(preds, **kwargs)
+
+    def _metric(self, preds, label):
+        pred_idxs = preds.argmax(axis=2)
+        decode_out_list = [[] for _ in range(pred_idxs.shape[0])]
+        label_decode_out_list = [[] for _ in range(pred_idxs.shape[0])]
+
+        for i in range(pred_idxs.shape[0]):
+            for j in range(pred_idxs.shape[1]):
+                if label[i, j] != -100:
+                    label_decode_out_list[i].append(self.id2label_map[label[i, j]])
+                    decode_out_list[i].append(self.id2label_map[pred_idxs[i, j]])
+        return decode_out_list, label_decode_out_list
+
+    def _infer(self, preds, attention_masks, segment_offset_ids, ocr_infos):
+        results = []
+
+        for pred, attention_mask, segment_offset_id, ocr_info in zip(
+            preds, attention_masks, segment_offset_ids, ocr_infos
+        ):
+            pred = np.argmax(pred, axis=1)
+            pred = [self.id2label_map[idx] for idx in pred]
+
+            for idx in range(len(segment_offset_id)):
+                if idx == 0:
+                    start_id = 0
+                else:
+                    start_id = segment_offset_id[idx - 1]
+
+                end_id = segment_offset_id[idx]
+
+                curr_pred = pred[start_id:end_id]
+                curr_pred = [self.label2id_map_for_draw[p] for p in curr_pred]
+
+                if len(curr_pred) <= 0:
+                    pred_id = 0
+                else:
+                    counts = np.bincount(curr_pred)
+                    pred_id = np.argmax(counts)
+                ocr_info[idx]["pred_id"] = int(pred_id)
+                ocr_info[idx]["pred"] = self.id2label_map_for_show[int(pred_id)]
+            results.append(ocr_info)
+        return results

ocr/ppocr/data/__init__.py

@@ -0,0 +1,79 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import os
+import signal
+import sys
+
+__dir__ = os.path.dirname(os.path.abspath(__file__))
+sys.path.append(os.path.abspath(os.path.join(__dir__, "../..")))
+
+import copy
+
+from paddle.io import BatchSampler, DataLoader, DistributedBatchSampler
+
+from .imaug import create_operators, transform
+
+__all__ = ["build_dataloader", "transform", "create_operators"]
+
+
+def term_mp(sig_num, frame):
+    """kill all child processes"""
+    pid = os.getpid()
+    pgid = os.getpgid(os.getpid())
+    print("main proc {} exit, kill process group " "{}".format(pid, pgid))
+    os.killpg(pgid, signal.SIGKILL)
+
+
+def build_dataloader(config, mode, device, logger, seed=None):
+    config = copy.deepcopy(config)
+
+    support_dict = ["SimpleDataSet", "LMDBDataSet", "PGDataSet", "PubTabDataSet"]
+    module_name = config[mode]["dataset"]["name"]
+    assert module_name in support_dict, Exception(
+        "DataSet only support {}".format(support_dict)
+    )
+    assert mode in ["Train", "Eval", "Test"], "Mode should be Train, Eval or Test."
+
+    dataset = eval(module_name)(config, mode, logger, seed)
+    loader_config = config[mode]["loader"]
+    batch_size = loader_config["batch_size_per_card"]
+    drop_last = loader_config["drop_last"]
+    shuffle = loader_config["shuffle"]
+    num_workers = loader_config["num_workers"]
+    if "use_shared_memory" in loader_config.keys():
+        use_shared_memory = loader_config["use_shared_memory"]
+    else:
+        use_shared_memory = True
+
+    if mode == "Train":
+        # Distribute data to multiple cards
+        batch_sampler = DistributedBatchSampler(
+            dataset=dataset, batch_size=batch_size, shuffle=shuffle, drop_last=drop_last
+        )
+    else:
+        # Distribute data to single card
+        batch_sampler = BatchSampler(
+            dataset=dataset, batch_size=batch_size, shuffle=shuffle, drop_last=drop_last
+        )
+
+    if "collate_fn" in loader_config:
+        from . import collate_fn
+
+        collate_fn = getattr(collate_fn, loader_config["collate_fn"])()
+    else:
+        collate_fn = None
+    data_loader = DataLoader(
+        dataset=dataset,
+        batch_sampler=batch_sampler,
+        places=device,
+        num_workers=num_workers,
+        return_list=True,
+        use_shared_memory=use_shared_memory,
+        collate_fn=collate_fn,
+    )
+
+    # support exit using ctrl+c
+    signal.signal(signal.SIGINT, term_mp)
+    signal.signal(signal.SIGTERM, term_mp)
+
+    return data_loader

ocr/ppocr/data/collate_fn.py

@@ -0,0 +1,59 @@
+import numbers
+from collections import defaultdict
+
+import numpy as np
+import paddle
+
+
+class DictCollator(object):
+    """
+    data batch
+    """
+
+    def __call__(self, batch):
+        # todo：support batch operators
+        data_dict = defaultdict(list)
+        to_tensor_keys = []
+        for sample in batch:
+            for k, v in sample.items():
+                if isinstance(v, (np.ndarray, paddle.Tensor, numbers.Number)):
+                    if k not in to_tensor_keys:
+                        to_tensor_keys.append(k)
+                data_dict[k].append(v)
+        for k in to_tensor_keys:
+            data_dict[k] = paddle.to_tensor(data_dict[k])
+        return data_dict
+
+
+class ListCollator(object):
+    """
+    data batch
+    """
+
+    def __call__(self, batch):
+        # todo：support batch operators
+        data_dict = defaultdict(list)
+        to_tensor_idxs = []
+        for sample in batch:
+            for idx, v in enumerate(sample):
+                if isinstance(v, (np.ndarray, paddle.Tensor, numbers.Number)):
+                    if idx not in to_tensor_idxs:
+                        to_tensor_idxs.append(idx)
+                data_dict[idx].append(v)
+        for idx in to_tensor_idxs:
+            data_dict[idx] = paddle.to_tensor(data_dict[idx])
+        return list(data_dict.values())
+
+
+class SSLRotateCollate(object):
+    """
+    bach: [
+        [(4*3xH*W), (4,)]
+        [(4*3xH*W), (4,)]
+        ...
+    ]
+    """
+
+    def __call__(self, batch):
+        output = [np.concatenate(d, axis=0) for d in zip(*batch)]
+        return output

ocr/ppocr/data/imaug/ColorJitter.py

@@ -0,0 +1,14 @@
+from paddle.vision.transforms import ColorJitter as pp_ColorJitter
+
+__all__ = ["ColorJitter"]
+
+
+class ColorJitter(object):
+    def __init__(self, brightness=0, contrast=0, saturation=0, hue=0, **kwargs):
+        self.aug = pp_ColorJitter(brightness, contrast, saturation, hue)
+
+    def __call__(self, data):
+        image = data["image"]
+        image = self.aug(image)
+        data["image"] = image
+        return data

ocr/ppocr/data/imaug/__init__.py

@@ -0,0 +1,61 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+from .ColorJitter import ColorJitter
+from .copy_paste import CopyPaste
+from .east_process import *
+from .fce_aug import *
+from .fce_targets import FCENetTargets
+from .gen_table_mask import *
+from .iaa_augment import IaaAugment
+from .label_ops import *
+from .make_border_map import MakeBorderMap
+from .make_pse_gt import MakePseGt
+from .make_shrink_map import MakeShrinkMap
+from .operators import *
+from .pg_process import *
+from .randaugment import RandAugment
+from .random_crop_data import EastRandomCropData, RandomCropImgMask
+from .rec_img_aug import (
+    ClsResizeImg,
+    NRTRRecResizeImg,
+    PRENResizeImg,
+    RecAug,
+    RecConAug,
+    RecResizeImg,
+    SARRecResizeImg,
+    SRNRecResizeImg,
+)
+from .sast_process import *
+from .ssl_img_aug import SSLRotateResize
+from .vqa import *
+
+
+def transform(data, ops=None):
+    """transform"""
+    if ops is None:
+        ops = []
+    for op in ops:
+        data = op(data)
+        if data is None:
+            return None
+    return data
+
+
+def create_operators(op_param_list, global_config=None):
+    """
+    create operators based on the config
+
+    Args:
+        params(list): a dict list, used to create some operators
+    """
+    assert isinstance(op_param_list, list), "operator config should be a list"
+    ops = []
+    for operator in op_param_list:
+        assert isinstance(operator, dict) and len(operator) == 1, "yaml format error"
+        op_name = list(operator)[0]
+        param = {} if operator[op_name] is None else operator[op_name]
+        if global_config is not None:
+            param.update(global_config)
+        op = eval(op_name)(**param)
+        ops.append(op)
+    return ops

ocr/ppocr/data/imaug/copy_paste.py

@@ -0,0 +1,167 @@
+import os
+import random
+
+import cv2
+import numpy as np
+from PIL import Image
+from shapely.geometry import Polygon
+
+from ppocr.data.imaug.iaa_augment import IaaAugment
+from ppocr.data.imaug.random_crop_data import is_poly_outside_rect
+from utility import get_rotate_crop_image
+
+
+class CopyPaste(object):
+    def __init__(self, objects_paste_ratio=0.2, limit_paste=True, **kwargs):
+        self.ext_data_num = 1
+        self.objects_paste_ratio = objects_paste_ratio
+        self.limit_paste = limit_paste
+        augmenter_args = [{"type": "Resize", "args": {"size": [0.5, 3]}}]
+        self.aug = IaaAugment(augmenter_args)
+
+    def __call__(self, data):
+        point_num = data["polys"].shape[1]
+        src_img = data["image"]
+        src_polys = data["polys"].tolist()
+        src_texts = data["texts"]
+        src_ignores = data["ignore_tags"].tolist()
+        ext_data = data["ext_data"][0]
+        ext_image = ext_data["image"]
+        ext_polys = ext_data["polys"]
+        ext_texts = ext_data["texts"]
+        ext_ignores = ext_data["ignore_tags"]
+
+        indexs = [i for i in range(len(ext_ignores)) if not ext_ignores[i]]
+        select_num = max(1, min(int(self.objects_paste_ratio * len(ext_polys)), 30))
+
+        random.shuffle(indexs)
+        select_idxs = indexs[:select_num]
+        select_polys = ext_polys[select_idxs]
+        select_ignores = ext_ignores[select_idxs]
+
+        src_img = cv2.cvtColor(src_img, cv2.COLOR_BGR2RGB)
+        ext_image = cv2.cvtColor(ext_image, cv2.COLOR_BGR2RGB)
+        src_img = Image.fromarray(src_img).convert("RGBA")
+        for idx, poly, tag in zip(select_idxs, select_polys, select_ignores):
+            box_img = get_rotate_crop_image(ext_image, poly)
+
+            src_img, box = self.paste_img(src_img, box_img, src_polys)
+            if box is not None:
+                box = box.tolist()
+                for _ in range(len(box), point_num):
+                    box.append(box[-1])
+                src_polys.append(box)
+                src_texts.append(ext_texts[idx])
+                src_ignores.append(tag)
+        src_img = cv2.cvtColor(np.array(src_img), cv2.COLOR_RGB2BGR)
+        h, w = src_img.shape[:2]
+        src_polys = np.array(src_polys)
+        src_polys[:, :, 0] = np.clip(src_polys[:, :, 0], 0, w)
+        src_polys[:, :, 1] = np.clip(src_polys[:, :, 1], 0, h)
+        data["image"] = src_img
+        data["polys"] = src_polys
+        data["texts"] = src_texts
+        data["ignore_tags"] = np.array(src_ignores)
+        return data
+
+    def paste_img(self, src_img, box_img, src_polys):
+        box_img_pil = Image.fromarray(box_img).convert("RGBA")
+        src_w, src_h = src_img.size
+        box_w, box_h = box_img_pil.size
+
+        angle = np.random.randint(0, 360)
+        box = np.array([[[0, 0], [box_w, 0], [box_w, box_h], [0, box_h]]])
+        box = rotate_bbox(box_img, box, angle)[0]
+        box_img_pil = box_img_pil.rotate(angle, expand=1)
+        box_w, box_h = box_img_pil.width, box_img_pil.height
+        if src_w - box_w < 0 or src_h - box_h < 0:
+            return src_img, None
+
+        paste_x, paste_y = self.select_coord(
+            src_polys, box, src_w - box_w, src_h - box_h
+        )
+        if paste_x is None:
+            return src_img, None
+        box[:, 0] += paste_x
+        box[:, 1] += paste_y
+        r, g, b, A = box_img_pil.split()
+        src_img.paste(box_img_pil, (paste_x, paste_y), mask=A)
+
+        return src_img, box
+
+    def select_coord(self, src_polys, box, endx, endy):
+        if self.limit_paste:
+            xmin, ymin, xmax, ymax = (
+                box[:, 0].min(),
+                box[:, 1].min(),
+                box[:, 0].max(),
+                box[:, 1].max(),
+            )
+            for _ in range(50):
+                paste_x = random.randint(0, endx)
+                paste_y = random.randint(0, endy)
+                xmin1 = xmin + paste_x
+                xmax1 = xmax + paste_x
+                ymin1 = ymin + paste_y
+                ymax1 = ymax + paste_y
+
+                num_poly_in_rect = 0
+                for poly in src_polys:
+                    if not is_poly_outside_rect(
+                        poly, xmin1, ymin1, xmax1 - xmin1, ymax1 - ymin1
+                    ):
+                        num_poly_in_rect += 1
+                        break
+                if num_poly_in_rect == 0:
+                    return paste_x, paste_y
+            return None, None
+        else:
+            paste_x = random.randint(0, endx)
+            paste_y = random.randint(0, endy)
+            return paste_x, paste_y
+
+
+def get_union(pD, pG):
+    return Polygon(pD).union(Polygon(pG)).area
+
+
+def get_intersection_over_union(pD, pG):
+    return get_intersection(pD, pG) / get_union(pD, pG)
+
+
+def get_intersection(pD, pG):
+    return Polygon(pD).intersection(Polygon(pG)).area
+
+
+def rotate_bbox(img, text_polys, angle, scale=1):
+    """
+    from https://github.com/WenmuZhou/DBNet.pytorch/blob/master/data_loader/modules/augment.py
+    Args:
+        img: np.ndarray
+        text_polys: np.ndarray N*4*2
+        angle: int
+        scale: int
+
+    Returns:
+
+    """
+    w = img.shape[1]
+    h = img.shape[0]
+
+    rangle = np.deg2rad(angle)
+    nw = abs(np.sin(rangle) * h) + abs(np.cos(rangle) * w)
+    nh = abs(np.cos(rangle) * h) + abs(np.sin(rangle) * w)
+    rot_mat = cv2.getRotationMatrix2D((nw * 0.5, nh * 0.5), angle, scale)
+    rot_move = np.dot(rot_mat, np.array([(nw - w) * 0.5, (nh - h) * 0.5, 0]))
+    rot_mat[0, 2] += rot_move[0]
+    rot_mat[1, 2] += rot_move[1]
+
+    # ---------------------- rotate box ----------------------
+    rot_text_polys = list()
+    for bbox in text_polys:
+        point1 = np.dot(rot_mat, np.array([bbox[0, 0], bbox[0, 1], 1]))
+        point2 = np.dot(rot_mat, np.array([bbox[1, 0], bbox[1, 1], 1]))
+        point3 = np.dot(rot_mat, np.array([bbox[2, 0], bbox[2, 1], 1]))
+        point4 = np.dot(rot_mat, np.array([bbox[3, 0], bbox[3, 1], 1]))
+        rot_text_polys.append([point1, point2, point3, point4])
+    return np.array(rot_text_polys, dtype=np.float32)

ocr/ppocr/data/imaug/east_process.py

@@ -0,0 +1,427 @@
+import math
+
+import cv2
+import numpy as np
+
+__all__ = ["EASTProcessTrain"]
+
+
+class EASTProcessTrain(object):
+    def __init__(
+        self,
+        image_shape=[512, 512],
+        background_ratio=0.125,
+        min_crop_side_ratio=0.1,
+        min_text_size=10,
+        **kwargs
+    ):
+        self.input_size = image_shape[1]
+        self.random_scale = np.array([0.5, 1, 2.0, 3.0])
+        self.background_ratio = background_ratio
+        self.min_crop_side_ratio = min_crop_side_ratio
+        self.min_text_size = min_text_size
+
+    def preprocess(self, im):
+        input_size = self.input_size
+        im_shape = im.shape
+        im_size_min = np.min(im_shape[0:2])
+        im_size_max = np.max(im_shape[0:2])
+        im_scale = float(input_size) / float(im_size_max)
+        im = cv2.resize(im, None, None, fx=im_scale, fy=im_scale)
+        img_mean = [0.485, 0.456, 0.406]
+        img_std = [0.229, 0.224, 0.225]
+        # im = im[:, :, ::-1].astype(np.float32)
+        im = im / 255
+        im -= img_mean
+        im /= img_std
+        new_h, new_w, _ = im.shape
+        im_padded = np.zeros((input_size, input_size, 3), dtype=np.float32)
+        im_padded[:new_h, :new_w, :] = im
+        im_padded = im_padded.transpose((2, 0, 1))
+        im_padded = im_padded[np.newaxis, :]
+        return im_padded, im_scale
+
+    def rotate_im_poly(self, im, text_polys):
+        """
+        rotate image with 90 / 180 / 270 degre
+        """
+        im_w, im_h = im.shape[1], im.shape[0]
+        dst_im = im.copy()
+        dst_polys = []
+        rand_degree_ratio = np.random.rand()
+        rand_degree_cnt = 1
+        if 0.333 < rand_degree_ratio < 0.666:
+            rand_degree_cnt = 2
+        elif rand_degree_ratio > 0.666:
+            rand_degree_cnt = 3
+        for i in range(rand_degree_cnt):
+            dst_im = np.rot90(dst_im)
+        rot_degree = -90 * rand_degree_cnt
+        rot_angle = rot_degree * math.pi / 180.0
+        n_poly = text_polys.shape[0]
+        cx, cy = 0.5 * im_w, 0.5 * im_h
+        ncx, ncy = 0.5 * dst_im.shape[1], 0.5 * dst_im.shape[0]
+        for i in range(n_poly):
+            wordBB = text_polys[i]
+            poly = []
+            for j in range(4):
+                sx, sy = wordBB[j][0], wordBB[j][1]
+                dx = (
+                    math.cos(rot_angle) * (sx - cx)
+                    - math.sin(rot_angle) * (sy - cy)
+                    + ncx
+                )
+                dy = (
+                    math.sin(rot_angle) * (sx - cx)
+                    + math.cos(rot_angle) * (sy - cy)
+                    + ncy
+                )
+                poly.append([dx, dy])
+            dst_polys.append(poly)
+        dst_polys = np.array(dst_polys, dtype=np.float32)
+        return dst_im, dst_polys
+
+    def polygon_area(self, poly):
+        """
+        compute area of a polygon
+        :param poly:
+        :return:
+        """
+        edge = [
+            (poly[1][0] - poly[0][0]) * (poly[1][1] + poly[0][1]),
+            (poly[2][0] - poly[1][0]) * (poly[2][1] + poly[1][1]),
+            (poly[3][0] - poly[2][0]) * (poly[3][1] + poly[2][1]),
+            (poly[0][0] - poly[3][0]) * (poly[0][1] + poly[3][1]),
+        ]
+        return np.sum(edge) / 2.0
+
+    def check_and_validate_polys(self, polys, tags, img_height, img_width):
+        """
+        check so that the text poly is in the same direction,
+        and also filter some invalid polygons
+        :param polys:
+        :param tags:
+        :return:
+        """
+        h, w = img_height, img_width
+        if polys.shape[0] == 0:
+            return polys
+        polys[:, :, 0] = np.clip(polys[:, :, 0], 0, w - 1)
+        polys[:, :, 1] = np.clip(polys[:, :, 1], 0, h - 1)
+
+        validated_polys = []
+        validated_tags = []
+        for poly, tag in zip(polys, tags):
+            p_area = self.polygon_area(poly)
+            # invalid poly
+            if abs(p_area) < 1:
+                continue
+            if p_area > 0:
+                #'poly in wrong direction'
+                if not tag:
+                    tag = True  # reversed cases should be ignore
+                poly = poly[(0, 3, 2, 1), :]
+            validated_polys.append(poly)
+            validated_tags.append(tag)
+        return np.array(validated_polys), np.array(validated_tags)
+
+    def draw_img_polys(self, img, polys):
+        if len(img.shape) == 4:
+            img = np.squeeze(img, axis=0)
+        if img.shape[0] == 3:
+            img = img.transpose((1, 2, 0))
+            img[:, :, 2] += 123.68
+            img[:, :, 1] += 116.78
+            img[:, :, 0] += 103.94
+        cv2.imwrite("tmp.jpg", img)
+        img = cv2.imread("tmp.jpg")
+        for box in polys:
+            box = box.astype(np.int32).reshape((-1, 1, 2))
+            cv2.polylines(img, [box], True, color=(255, 255, 0), thickness=2)
+        import random
+
+        ino = random.randint(0, 100)
+        cv2.imwrite("tmp_%d.jpg" % ino, img)
+        return
+
+    def shrink_poly(self, poly, r):
+        """
+        fit a poly inside the origin poly, maybe bugs here...
+        used for generate the score map
+        :param poly: the text poly
+        :param r: r in the paper
+        :return: the shrinked poly
+        """
+        # shrink ratio
+        R = 0.3
+        # find the longer pair
+        dist0 = np.linalg.norm(poly[0] - poly[1])
+        dist1 = np.linalg.norm(poly[2] - poly[3])
+        dist2 = np.linalg.norm(poly[0] - poly[3])
+        dist3 = np.linalg.norm(poly[1] - poly[2])
+        if dist0 + dist1 > dist2 + dist3:
+            # first move (p0, p1), (p2, p3), then (p0, p3), (p1, p2)
+            ## p0, p1
+            theta = np.arctan2((poly[1][1] - poly[0][1]), (poly[1][0] - poly[0][0]))
+            poly[0][0] += R * r[0] * np.cos(theta)
+            poly[0][1] += R * r[0] * np.sin(theta)
+            poly[1][0] -= R * r[1] * np.cos(theta)
+            poly[1][1] -= R * r[1] * np.sin(theta)
+            ## p2, p3
+            theta = np.arctan2((poly[2][1] - poly[3][1]), (poly[2][0] - poly[3][0]))
+            poly[3][0] += R * r[3] * np.cos(theta)
+            poly[3][1] += R * r[3] * np.sin(theta)
+            poly[2][0] -= R * r[2] * np.cos(theta)
+            poly[2][1] -= R * r[2] * np.sin(theta)
+            ## p0, p3
+            theta = np.arctan2((poly[3][0] - poly[0][0]), (poly[3][1] - poly[0][1]))
+            poly[0][0] += R * r[0] * np.sin(theta)
+            poly[0][1] += R * r[0] * np.cos(theta)
+            poly[3][0] -= R * r[3] * np.sin(theta)
+            poly[3][1] -= R * r[3] * np.cos(theta)
+            ## p1, p2
+            theta = np.arctan2((poly[2][0] - poly[1][0]), (poly[2][1] - poly[1][1]))
+            poly[1][0] += R * r[1] * np.sin(theta)
+            poly[1][1] += R * r[1] * np.cos(theta)
+            poly[2][0] -= R * r[2] * np.sin(theta)
+            poly[2][1] -= R * r[2] * np.cos(theta)
+        else:
+            ## p0, p3
+            # print poly
+            theta = np.arctan2((poly[3][0] - poly[0][0]), (poly[3][1] - poly[0][1]))
+            poly[0][0] += R * r[0] * np.sin(theta)
+            poly[0][1] += R * r[0] * np.cos(theta)
+            poly[3][0] -= R * r[3] * np.sin(theta)
+            poly[3][1] -= R * r[3] * np.cos(theta)
+            ## p1, p2
+            theta = np.arctan2((poly[2][0] - poly[1][0]), (poly[2][1] - poly[1][1]))
+            poly[1][0] += R * r[1] * np.sin(theta)
+            poly[1][1] += R * r[1] * np.cos(theta)
+            poly[2][0] -= R * r[2] * np.sin(theta)
+            poly[2][1] -= R * r[2] * np.cos(theta)
+            ## p0, p1
+            theta = np.arctan2((poly[1][1] - poly[0][1]), (poly[1][0] - poly[0][0]))
+            poly[0][0] += R * r[0] * np.cos(theta)
+            poly[0][1] += R * r[0] * np.sin(theta)
+            poly[1][0] -= R * r[1] * np.cos(theta)
+            poly[1][1] -= R * r[1] * np.sin(theta)
+            ## p2, p3
+            theta = np.arctan2((poly[2][1] - poly[3][1]), (poly[2][0] - poly[3][0]))
+            poly[3][0] += R * r[3] * np.cos(theta)
+            poly[3][1] += R * r[3] * np.sin(theta)
+            poly[2][0] -= R * r[2] * np.cos(theta)
+            poly[2][1] -= R * r[2] * np.sin(theta)
+        return poly
+
+    def generate_quad(self, im_size, polys, tags):
+        """
+        Generate quadrangle.
+        """
+        h, w = im_size
+        poly_mask = np.zeros((h, w), dtype=np.uint8)
+        score_map = np.zeros((h, w), dtype=np.uint8)
+        # (x1, y1, ..., x4, y4, short_edge_norm)
+        geo_map = np.zeros((h, w, 9), dtype=np.float32)
+        # mask used during traning, to ignore some hard areas
+        training_mask = np.ones((h, w), dtype=np.uint8)
+        for poly_idx, poly_tag in enumerate(zip(polys, tags)):
+            poly = poly_tag[0]
+            tag = poly_tag[1]
+
+            r = [None, None, None, None]
+            for i in range(4):
+                dist1 = np.linalg.norm(poly[i] - poly[(i + 1) % 4])
+                dist2 = np.linalg.norm(poly[i] - poly[(i - 1) % 4])
+                r[i] = min(dist1, dist2)
+            # score map
+            shrinked_poly = self.shrink_poly(poly.copy(), r).astype(np.int32)[
+                np.newaxis, :, :
+            ]
+            cv2.fillPoly(score_map, shrinked_poly, 1)
+            cv2.fillPoly(poly_mask, shrinked_poly, poly_idx + 1)
+            # if the poly is too small, then ignore it during training
+            poly_h = min(
+                np.linalg.norm(poly[0] - poly[3]), np.linalg.norm(poly[1] - poly[2])
+            )
+            poly_w = min(
+                np.linalg.norm(poly[0] - poly[1]), np.linalg.norm(poly[2] - poly[3])
+            )
+            if min(poly_h, poly_w) < self.min_text_size:
+                cv2.fillPoly(training_mask, poly.astype(np.int32)[np.newaxis, :, :], 0)
+
+            if tag:
+                cv2.fillPoly(training_mask, poly.astype(np.int32)[np.newaxis, :, :], 0)
+
+            xy_in_poly = np.argwhere(poly_mask == (poly_idx + 1))
+            # geo map.
+            y_in_poly = xy_in_poly[:, 0]
+            x_in_poly = xy_in_poly[:, 1]
+            poly[:, 0] = np.minimum(np.maximum(poly[:, 0], 0), w)
+            poly[:, 1] = np.minimum(np.maximum(poly[:, 1], 0), h)
+            for pno in range(4):
+                geo_channel_beg = pno * 2
+                geo_map[y_in_poly, x_in_poly, geo_channel_beg] = (
+                    x_in_poly - poly[pno, 0]
+                )
+                geo_map[y_in_poly, x_in_poly, geo_channel_beg + 1] = (
+                    y_in_poly - poly[pno, 1]
+                )
+            geo_map[y_in_poly, x_in_poly, 8] = 1.0 / max(min(poly_h, poly_w), 1.0)
+        return score_map, geo_map, training_mask
+
+    def crop_area(self, im, polys, tags, crop_background=False, max_tries=50):
+        """
+        make random crop from the input image
+        :param im:
+        :param polys:
+        :param tags:
+        :param crop_background:
+        :param max_tries:
+        :return:
+        """
+        h, w, _ = im.shape
+        pad_h = h // 10
+        pad_w = w // 10
+        h_array = np.zeros((h + pad_h * 2), dtype=np.int32)
+        w_array = np.zeros((w + pad_w * 2), dtype=np.int32)
+        for poly in polys:
+            poly = np.round(poly, decimals=0).astype(np.int32)
+            minx = np.min(poly[:, 0])
+            maxx = np.max(poly[:, 0])
+            w_array[minx + pad_w : maxx + pad_w] = 1
+            miny = np.min(poly[:, 1])
+            maxy = np.max(poly[:, 1])
+            h_array[miny + pad_h : maxy + pad_h] = 1
+        # ensure the cropped area not across a text
+        h_axis = np.where(h_array == 0)[0]
+        w_axis = np.where(w_array == 0)[0]
+        if len(h_axis) == 0 or len(w_axis) == 0:
+            return im, polys, tags
+
+        for i in range(max_tries):
+            xx = np.random.choice(w_axis, size=2)
+            xmin = np.min(xx) - pad_w
+            xmax = np.max(xx) - pad_w
+            xmin = np.clip(xmin, 0, w - 1)
+            xmax = np.clip(xmax, 0, w - 1)
+            yy = np.random.choice(h_axis, size=2)
+            ymin = np.min(yy) - pad_h
+            ymax = np.max(yy) - pad_h
+            ymin = np.clip(ymin, 0, h - 1)
+            ymax = np.clip(ymax, 0, h - 1)
+            if (
+                xmax - xmin < self.min_crop_side_ratio * w
+                or ymax - ymin < self.min_crop_side_ratio * h
+            ):
+                # area too small
+                continue
+            if polys.shape[0] != 0:
+                poly_axis_in_area = (
+                    (polys[:, :, 0] >= xmin)
+                    & (polys[:, :, 0] <= xmax)
+                    & (polys[:, :, 1] >= ymin)
+                    & (polys[:, :, 1] <= ymax)
+                )
+                selected_polys = np.where(np.sum(poly_axis_in_area, axis=1) == 4)[0]
+            else:
+                selected_polys = []
+
+            if len(selected_polys) == 0:
+                # no text in this area
+                if crop_background:
+                    im = im[ymin : ymax + 1, xmin : xmax + 1, :]
+                    polys = []
+                    tags = []
+                    return im, polys, tags
+                else:
+                    continue
+
+            im = im[ymin : ymax + 1, xmin : xmax + 1, :]
+            polys = polys[selected_polys]
+            tags = tags[selected_polys]
+            polys[:, :, 0] -= xmin
+            polys[:, :, 1] -= ymin
+            return im, polys, tags
+        return im, polys, tags
+
+    def crop_background_infor(self, im, text_polys, text_tags):
+        im, text_polys, text_tags = self.crop_area(
+            im, text_polys, text_tags, crop_background=True
+        )
+
+        if len(text_polys) > 0:
+            return None
+        # pad and resize image
+        input_size = self.input_size
+        im, ratio = self.preprocess(im)
+        score_map = np.zeros((input_size, input_size), dtype=np.float32)
+        geo_map = np.zeros((input_size, input_size, 9), dtype=np.float32)
+        training_mask = np.ones((input_size, input_size), dtype=np.float32)
+        return im, score_map, geo_map, training_mask
+
+    def crop_foreground_infor(self, im, text_polys, text_tags):
+        im, text_polys, text_tags = self.crop_area(
+            im, text_polys, text_tags, crop_background=False
+        )
+
+        if text_polys.shape[0] == 0:
+            return None
+        # continue for all ignore case
+        if np.sum((text_tags * 1.0)) >= text_tags.size:
+            return None
+        # pad and resize image
+        input_size = self.input_size
+        im, ratio = self.preprocess(im)
+        text_polys[:, :, 0] *= ratio
+        text_polys[:, :, 1] *= ratio
+        _, _, new_h, new_w = im.shape
+        #         print(im.shape)
+        #         self.draw_img_polys(im, text_polys)
+        score_map, geo_map, training_mask = self.generate_quad(
+            (new_h, new_w), text_polys, text_tags
+        )
+        return im, score_map, geo_map, training_mask
+
+    def __call__(self, data):
+        im = data["image"]
+        text_polys = data["polys"]
+        text_tags = data["ignore_tags"]
+        if im is None:
+            return None
+        if text_polys.shape[0] == 0:
+            return None
+
+        # add rotate cases
+        if np.random.rand() < 0.5:
+            im, text_polys = self.rotate_im_poly(im, text_polys)
+        h, w, _ = im.shape
+        text_polys, text_tags = self.check_and_validate_polys(
+            text_polys, text_tags, h, w
+        )
+        if text_polys.shape[0] == 0:
+            return None
+
+        # random scale this image
+        rd_scale = np.random.choice(self.random_scale)
+        im = cv2.resize(im, dsize=None, fx=rd_scale, fy=rd_scale)
+        text_polys *= rd_scale
+        if np.random.rand() < self.background_ratio:
+            outs = self.crop_background_infor(im, text_polys, text_tags)
+        else:
+            outs = self.crop_foreground_infor(im, text_polys, text_tags)
+
+        if outs is None:
+            return None
+        im, score_map, geo_map, training_mask = outs
+        score_map = score_map[np.newaxis, ::4, ::4].astype(np.float32)
+        geo_map = np.swapaxes(geo_map, 1, 2)
+        geo_map = np.swapaxes(geo_map, 1, 0)
+        geo_map = geo_map[:, ::4, ::4].astype(np.float32)
+        training_mask = training_mask[np.newaxis, ::4, ::4]
+        training_mask = training_mask.astype(np.float32)
+
+        data["image"] = im[0]
+        data["score_map"] = score_map
+        data["geo_map"] = geo_map
+        data["training_mask"] = training_mask
+        return data

ocr/ppocr/data/imaug/fce_aug.py

@@ -0,0 +1,563 @@
+import math
+import os
+
+import cv2
+import numpy as np
+from PIL import Image, ImageDraw
+from shapely.geometry import Polygon
+
+from postprocess.poly_nms import poly_intersection
+
+
+class RandomScaling:
+    def __init__(self, size=800, scale=(3.0 / 4, 5.0 / 2), **kwargs):
+        """Random scale the image while keeping aspect.
+
+        Args:
+            size (int) : Base size before scaling.
+            scale (tuple(float)) : The range of scaling.
+        """
+        assert isinstance(size, int)
+        assert isinstance(scale, float) or isinstance(scale, tuple)
+        self.size = size
+        self.scale = scale if isinstance(scale, tuple) else (1 - scale, 1 + scale)
+
+    def __call__(self, data):
+        image = data["image"]
+        text_polys = data["polys"]
+        h, w, _ = image.shape
+
+        aspect_ratio = np.random.uniform(min(self.scale), max(self.scale))
+        scales = self.size * 1.0 / max(h, w) * aspect_ratio
+        scales = np.array([scales, scales])
+        out_size = (int(h * scales[1]), int(w * scales[0]))
+        image = cv2.resize(image, out_size[::-1])
+
+        data["image"] = image
+        text_polys[:, :, 0::2] = text_polys[:, :, 0::2] * scales[1]
+        text_polys[:, :, 1::2] = text_polys[:, :, 1::2] * scales[0]
+        data["polys"] = text_polys
+
+        return data
+
+
+class RandomCropFlip:
+    def __init__(
+        self, pad_ratio=0.1, crop_ratio=0.5, iter_num=1, min_area_ratio=0.2, **kwargs
+    ):
+        """Random crop and flip a patch of the image.
+
+        Args:
+            crop_ratio (float): The ratio of cropping.
+            iter_num (int): Number of operations.
+            min_area_ratio (float): Minimal area ratio between cropped patch
+                and original image.
+        """
+        assert isinstance(crop_ratio, float)
+        assert isinstance(iter_num, int)
+        assert isinstance(min_area_ratio, float)
+
+        self.pad_ratio = pad_ratio
+        self.epsilon = 1e-2
+        self.crop_ratio = crop_ratio
+        self.iter_num = iter_num
+        self.min_area_ratio = min_area_ratio
+
+    def __call__(self, results):
+        for i in range(self.iter_num):
+            results = self.random_crop_flip(results)
+
+        return results
+
+    def random_crop_flip(self, results):
+        image = results["image"]
+        polygons = results["polys"]
+        ignore_tags = results["ignore_tags"]
+        if len(polygons) == 0:
+            return results
+
+        if np.random.random() >= self.crop_ratio:
+            return results
+
+        h, w, _ = image.shape
+        area = h * w
+        pad_h = int(h * self.pad_ratio)
+        pad_w = int(w * self.pad_ratio)
+        h_axis, w_axis = self.generate_crop_target(image, polygons, pad_h, pad_w)
+        if len(h_axis) == 0 or len(w_axis) == 0:
+            return results
+
+        attempt = 0
+        while attempt < 50:
+            attempt += 1
+            polys_keep = []
+            polys_new = []
+            ignore_tags_keep = []
+            ignore_tags_new = []
+            xx = np.random.choice(w_axis, size=2)
+            xmin = np.min(xx) - pad_w
+            xmax = np.max(xx) - pad_w
+            xmin = np.clip(xmin, 0, w - 1)
+            xmax = np.clip(xmax, 0, w - 1)
+            yy = np.random.choice(h_axis, size=2)
+            ymin = np.min(yy) - pad_h
+            ymax = np.max(yy) - pad_h
+            ymin = np.clip(ymin, 0, h - 1)
+            ymax = np.clip(ymax, 0, h - 1)
+            if (xmax - xmin) * (ymax - ymin) < area * self.min_area_ratio:
+                # area too small
+                continue
+
+            pts = np.stack(
+                [[xmin, xmax, xmax, xmin], [ymin, ymin, ymax, ymax]]
+            ).T.astype(np.int32)
+            pp = Polygon(pts)
+            fail_flag = False
+            for polygon, ignore_tag in zip(polygons, ignore_tags):
+                ppi = Polygon(polygon.reshape(-1, 2))
+                ppiou, _ = poly_intersection(ppi, pp, buffer=0)
+                if (
+                    np.abs(ppiou - float(ppi.area)) > self.epsilon
+                    and np.abs(ppiou) > self.epsilon
+                ):
+                    fail_flag = True
+                    break
+                elif np.abs(ppiou - float(ppi.area)) < self.epsilon:
+                    polys_new.append(polygon)
+                    ignore_tags_new.append(ignore_tag)
+                else:
+                    polys_keep.append(polygon)
+                    ignore_tags_keep.append(ignore_tag)
+
+            if fail_flag:
+                continue
+            else:
+                break
+
+        cropped = image[ymin:ymax, xmin:xmax, :]
+        select_type = np.random.randint(3)
+        if select_type == 0:
+            img = np.ascontiguousarray(cropped[:, ::-1])
+        elif select_type == 1:
+            img = np.ascontiguousarray(cropped[::-1, :])
+        else:
+            img = np.ascontiguousarray(cropped[::-1, ::-1])
+        image[ymin:ymax, xmin:xmax, :] = img
+        results["img"] = image
+
+        if len(polys_new) != 0:
+            height, width, _ = cropped.shape
+            if select_type == 0:
+                for idx, polygon in enumerate(polys_new):
+                    poly = polygon.reshape(-1, 2)
+                    poly[:, 0] = width - poly[:, 0] + 2 * xmin
+                    polys_new[idx] = poly
+            elif select_type == 1:
+                for idx, polygon in enumerate(polys_new):
+                    poly = polygon.reshape(-1, 2)
+                    poly[:, 1] = height - poly[:, 1] + 2 * ymin
+                    polys_new[idx] = poly
+            else:
+                for idx, polygon in enumerate(polys_new):
+                    poly = polygon.reshape(-1, 2)
+                    poly[:, 0] = width - poly[:, 0] + 2 * xmin
+                    poly[:, 1] = height - poly[:, 1] + 2 * ymin
+                    polys_new[idx] = poly
+            polygons = polys_keep + polys_new
+            ignore_tags = ignore_tags_keep + ignore_tags_new
+            results["polys"] = np.array(polygons)
+            results["ignore_tags"] = ignore_tags
+
+        return results
+
+    def generate_crop_target(self, image, all_polys, pad_h, pad_w):
+        """Generate crop target and make sure not to crop the polygon
+        instances.
+
+        Args:
+            image (ndarray): The image waited to be crop.
+            all_polys (list[list[ndarray]]): All polygons including ground
+                truth polygons and ground truth ignored polygons.
+            pad_h (int): Padding length of height.
+            pad_w (int): Padding length of width.
+        Returns:
+            h_axis (ndarray): Vertical cropping range.
+            w_axis (ndarray): Horizontal cropping range.
+        """
+        h, w, _ = image.shape
+        h_array = np.zeros((h + pad_h * 2), dtype=np.int32)
+        w_array = np.zeros((w + pad_w * 2), dtype=np.int32)
+
+        text_polys = []
+        for polygon in all_polys:
+            rect = cv2.minAreaRect(polygon.astype(np.int32).reshape(-1, 2))
+            box = cv2.boxPoints(rect)
+            box = np.int0(box)
+            text_polys.append([box[0], box[1], box[2], box[3]])
+
+        polys = np.array(text_polys, dtype=np.int32)
+        for poly in polys:
+            poly = np.round(poly, decimals=0).astype(np.int32)
+            minx = np.min(poly[:, 0])
+            maxx = np.max(poly[:, 0])
+            w_array[minx + pad_w : maxx + pad_w] = 1
+            miny = np.min(poly[:, 1])
+            maxy = np.max(poly[:, 1])
+            h_array[miny + pad_h : maxy + pad_h] = 1
+
+        h_axis = np.where(h_array == 0)[0]
+        w_axis = np.where(w_array == 0)[0]
+        return h_axis, w_axis
+
+
+class RandomCropPolyInstances:
+    """Randomly crop images and make sure to contain at least one intact
+    instance."""
+
+    def __init__(self, crop_ratio=5.0 / 8.0, min_side_ratio=0.4, **kwargs):
+        super().__init__()
+        self.crop_ratio = crop_ratio
+        self.min_side_ratio = min_side_ratio
+
+    def sample_valid_start_end(self, valid_array, min_len, max_start, min_end):
+
+        assert isinstance(min_len, int)
+        assert len(valid_array) > min_len
+
+        start_array = valid_array.copy()
+        max_start = min(len(start_array) - min_len, max_start)
+        start_array[max_start:] = 0
+        start_array[0] = 1
+        diff_array = np.hstack([0, start_array]) - np.hstack([start_array, 0])
+        region_starts = np.where(diff_array < 0)[0]
+        region_ends = np.where(diff_array > 0)[0]
+        region_ind = np.random.randint(0, len(region_starts))
+        start = np.random.randint(region_starts[region_ind], region_ends[region_ind])
+
+        end_array = valid_array.copy()
+        min_end = max(start + min_len, min_end)
+        end_array[:min_end] = 0
+        end_array[-1] = 1
+        diff_array = np.hstack([0, end_array]) - np.hstack([end_array, 0])
+        region_starts = np.where(diff_array < 0)[0]
+        region_ends = np.where(diff_array > 0)[0]
+        region_ind = np.random.randint(0, len(region_starts))
+        end = np.random.randint(region_starts[region_ind], region_ends[region_ind])
+        return start, end
+
+    def sample_crop_box(self, img_size, results):
+        """Generate crop box and make sure not to crop the polygon instances.
+
+        Args:
+            img_size (tuple(int)): The image size (h, w).
+            results (dict): The results dict.
+        """
+
+        assert isinstance(img_size, tuple)
+        h, w = img_size[:2]
+
+        key_masks = results["polys"]
+
+        x_valid_array = np.ones(w, dtype=np.int32)
+        y_valid_array = np.ones(h, dtype=np.int32)
+
+        selected_mask = key_masks[np.random.randint(0, len(key_masks))]
+        selected_mask = selected_mask.reshape((-1, 2)).astype(np.int32)
+        max_x_start = max(np.min(selected_mask[:, 0]) - 2, 0)
+        min_x_end = min(np.max(selected_mask[:, 0]) + 3, w - 1)
+        max_y_start = max(np.min(selected_mask[:, 1]) - 2, 0)
+        min_y_end = min(np.max(selected_mask[:, 1]) + 3, h - 1)
+
+        for mask in key_masks:
+            mask = mask.reshape((-1, 2)).astype(np.int32)
+            clip_x = np.clip(mask[:, 0], 0, w - 1)
+            clip_y = np.clip(mask[:, 1], 0, h - 1)
+            min_x, max_x = np.min(clip_x), np.max(clip_x)
+            min_y, max_y = np.min(clip_y), np.max(clip_y)
+
+            x_valid_array[min_x - 2 : max_x + 3] = 0
+            y_valid_array[min_y - 2 : max_y + 3] = 0
+
+        min_w = int(w * self.min_side_ratio)
+        min_h = int(h * self.min_side_ratio)
+
+        x1, x2 = self.sample_valid_start_end(
+            x_valid_array, min_w, max_x_start, min_x_end
+        )
+        y1, y2 = self.sample_valid_start_end(
+            y_valid_array, min_h, max_y_start, min_y_end
+        )
+
+        return np.array([x1, y1, x2, y2])
+
+    def crop_img(self, img, bbox):
+        assert img.ndim == 3
+        h, w, _ = img.shape
+        assert 0 <= bbox[1] < bbox[3] <= h
+        assert 0 <= bbox[0] < bbox[2] <= w
+        return img[bbox[1] : bbox[3], bbox[0] : bbox[2]]
+
+    def __call__(self, results):
+        image = results["image"]
+        polygons = results["polys"]
+        ignore_tags = results["ignore_tags"]
+        if len(polygons) < 1:
+            return results
+
+        if np.random.random_sample() < self.crop_ratio:
+
+            crop_box = self.sample_crop_box(image.shape, results)
+            img = self.crop_img(image, crop_box)
+            results["image"] = img
+            # crop and filter masks
+            x1, y1, x2, y2 = crop_box
+            w = max(x2 - x1, 1)
+            h = max(y2 - y1, 1)
+            polygons[:, :, 0::2] = polygons[:, :, 0::2] - x1
+            polygons[:, :, 1::2] = polygons[:, :, 1::2] - y1
+
+            valid_masks_list = []
+            valid_tags_list = []
+            for ind, polygon in enumerate(polygons):
+                if (
+                    (polygon[:, ::2] > -4).all()
+                    and (polygon[:, ::2] < w + 4).all()
+                    and (polygon[:, 1::2] > -4).all()
+                    and (polygon[:, 1::2] < h + 4).all()
+                ):
+                    polygon[:, ::2] = np.clip(polygon[:, ::2], 0, w)
+                    polygon[:, 1::2] = np.clip(polygon[:, 1::2], 0, h)
+                    valid_masks_list.append(polygon)
+                    valid_tags_list.append(ignore_tags[ind])
+
+            results["polys"] = np.array(valid_masks_list)
+            results["ignore_tags"] = valid_tags_list
+
+        return results
+
+    def __repr__(self):
+        repr_str = self.__class__.__name__
+        return repr_str
+
+
+class RandomRotatePolyInstances:
+    def __init__(
+        self,
+        rotate_ratio=0.5,
+        max_angle=10,
+        pad_with_fixed_color=False,
+        pad_value=(0, 0, 0),
+        **kwargs
+    ):
+        """Randomly rotate images and polygon masks.
+
+        Args:
+            rotate_ratio (float): The ratio of samples to operate rotation.
+            max_angle (int): The maximum rotation angle.
+            pad_with_fixed_color (bool): The flag for whether to pad rotated
+               image with fixed value. If set to False, the rotated image will
+               be padded onto cropped image.
+            pad_value (tuple(int)): The color value for padding rotated image.
+        """
+        self.rotate_ratio = rotate_ratio
+        self.max_angle = max_angle
+        self.pad_with_fixed_color = pad_with_fixed_color
+        self.pad_value = pad_value
+
+    def rotate(self, center, points, theta, center_shift=(0, 0)):
+        # rotate points.
+        (center_x, center_y) = center
+        center_y = -center_y
+        x, y = points[:, ::2], points[:, 1::2]
+        y = -y
+
+        theta = theta / 180 * math.pi
+        cos = math.cos(theta)
+        sin = math.sin(theta)
+
+        x = x - center_x
+        y = y - center_y
+
+        _x = center_x + x * cos - y * sin + center_shift[0]
+        _y = -(center_y + x * sin + y * cos) + center_shift[1]
+
+        points[:, ::2], points[:, 1::2] = _x, _y
+        return points
+
+    def cal_canvas_size(self, ori_size, degree):
+        assert isinstance(ori_size, tuple)
+        angle = degree * math.pi / 180.0
+        h, w = ori_size[:2]
+
+        cos = math.cos(angle)
+        sin = math.sin(angle)
+        canvas_h = int(w * math.fabs(sin) + h * math.fabs(cos))
+        canvas_w = int(w * math.fabs(cos) + h * math.fabs(sin))
+
+        canvas_size = (canvas_h, canvas_w)
+        return canvas_size
+
+    def sample_angle(self, max_angle):
+        angle = np.random.random_sample() * 2 * max_angle - max_angle
+        return angle
+
+    def rotate_img(self, img, angle, canvas_size):
+        h, w = img.shape[:2]
+        rotation_matrix = cv2.getRotationMatrix2D((w / 2, h / 2), angle, 1)
+        rotation_matrix[0, 2] += int((canvas_size[1] - w) / 2)
+        rotation_matrix[1, 2] += int((canvas_size[0] - h) / 2)
+
+        if self.pad_with_fixed_color:
+            target_img = cv2.warpAffine(
+                img,
+                rotation_matrix,
+                (canvas_size[1], canvas_size[0]),
+                flags=cv2.INTER_NEAREST,
+                borderValue=self.pad_value,
+            )
+        else:
+            mask = np.zeros_like(img)
+            (h_ind, w_ind) = (
+                np.random.randint(0, h * 7 // 8),
+                np.random.randint(0, w * 7 // 8),
+            )
+            img_cut = img[h_ind : (h_ind + h // 9), w_ind : (w_ind + w // 9)]
+            img_cut = cv2.resize(img_cut, (canvas_size[1], canvas_size[0]))
+
+            mask = cv2.warpAffine(
+                mask,
+                rotation_matrix,
+                (canvas_size[1], canvas_size[0]),
+                borderValue=[1, 1, 1],
+            )
+            target_img = cv2.warpAffine(
+                img,
+                rotation_matrix,
+                (canvas_size[1], canvas_size[0]),
+                borderValue=[0, 0, 0],
+            )
+            target_img = target_img + img_cut * mask
+
+        return target_img
+
+    def __call__(self, results):
+        if np.random.random_sample() < self.rotate_ratio:
+            image = results["image"]
+            polygons = results["polys"]
+            h, w = image.shape[:2]
+
+            angle = self.sample_angle(self.max_angle)
+            canvas_size = self.cal_canvas_size((h, w), angle)
+            center_shift = (
+                int((canvas_size[1] - w) / 2),
+                int((canvas_size[0] - h) / 2),
+            )
+            image = self.rotate_img(image, angle, canvas_size)
+            results["image"] = image
+            # rotate polygons
+            rotated_masks = []
+            for mask in polygons:
+                rotated_mask = self.rotate((w / 2, h / 2), mask, angle, center_shift)
+                rotated_masks.append(rotated_mask)
+            results["polys"] = np.array(rotated_masks)
+
+        return results
+
+    def __repr__(self):
+        repr_str = self.__class__.__name__
+        return repr_str
+
+
+class SquareResizePad:
+    def __init__(
+        self,
+        target_size,
+        pad_ratio=0.6,
+        pad_with_fixed_color=False,
+        pad_value=(0, 0, 0),
+        **kwargs
+    ):
+        """Resize or pad images to be square shape.
+
+        Args:
+            target_size (int): The target size of square shaped image.
+            pad_with_fixed_color (bool): The flag for whether to pad rotated
+               image with fixed value. If set to False, the rescales image will
+               be padded onto cropped image.
+            pad_value (tuple(int)): The color value for padding rotated image.
+        """
+        assert isinstance(target_size, int)
+        assert isinstance(pad_ratio, float)
+        assert isinstance(pad_with_fixed_color, bool)
+        assert isinstance(pad_value, tuple)
+
+        self.target_size = target_size
+        self.pad_ratio = pad_ratio
+        self.pad_with_fixed_color = pad_with_fixed_color
+        self.pad_value = pad_value
+
+    def resize_img(self, img, keep_ratio=True):
+        h, w, _ = img.shape
+        if keep_ratio:
+            t_h = self.target_size if h >= w else int(h * self.target_size / w)
+            t_w = self.target_size if h <= w else int(w * self.target_size / h)
+        else:
+            t_h = t_w = self.target_size
+        img = cv2.resize(img, (t_w, t_h))
+        return img, (t_h, t_w)
+
+    def square_pad(self, img):
+        h, w = img.shape[:2]
+        if h == w:
+            return img, (0, 0)
+        pad_size = max(h, w)
+        if self.pad_with_fixed_color:
+            expand_img = np.ones((pad_size, pad_size, 3), dtype=np.uint8)
+            expand_img[:] = self.pad_value
+        else:
+            (h_ind, w_ind) = (
+                np.random.randint(0, h * 7 // 8),
+                np.random.randint(0, w * 7 // 8),
+            )
+            img_cut = img[h_ind : (h_ind + h // 9), w_ind : (w_ind + w // 9)]
+            expand_img = cv2.resize(img_cut, (pad_size, pad_size))
+        if h > w:
+            y0, x0 = 0, (h - w) // 2
+        else:
+            y0, x0 = (w - h) // 2, 0
+        expand_img[y0 : y0 + h, x0 : x0 + w] = img
+        offset = (x0, y0)
+
+        return expand_img, offset
+
+    def square_pad_mask(self, points, offset):
+        x0, y0 = offset
+        pad_points = points.copy()
+        pad_points[::2] = pad_points[::2] + x0
+        pad_points[1::2] = pad_points[1::2] + y0
+        return pad_points
+
+    def __call__(self, results):
+        image = results["image"]
+        polygons = results["polys"]
+        h, w = image.shape[:2]
+
+        if np.random.random_sample() < self.pad_ratio:
+            image, out_size = self.resize_img(image, keep_ratio=True)
+            image, offset = self.square_pad(image)
+        else:
+            image, out_size = self.resize_img(image, keep_ratio=False)
+            offset = (0, 0)
+        results["image"] = image
+        try:
+            polygons[:, :, 0::2] = polygons[:, :, 0::2] * out_size[1] / w + offset[0]
+            polygons[:, :, 1::2] = polygons[:, :, 1::2] * out_size[0] / h + offset[1]
+        except:
+            pass
+        results["polys"] = polygons
+
+        return results
+
+    def __repr__(self):
+        repr_str = self.__class__.__name__
+        return repr_str

ocr/ppocr/data/imaug/fce_targets.py

@@ -0,0 +1,671 @@
+import cv2
+import numpy as np
+from numpy.fft import fft
+from numpy.linalg import norm
+
+
+def vector_slope(vec):
+    assert len(vec) == 2
+    return abs(vec[1] / (vec[0] + 1e-8))
+
+
+class FCENetTargets:
+    """Generate the ground truth targets of FCENet: Fourier Contour Embedding
+    for Arbitrary-Shaped Text Detection.
+
+    [https://arxiv.org/abs/2104.10442]
+
+    Args:
+        fourier_degree (int): The maximum Fourier transform degree k.
+        resample_step (float): The step size for resampling the text center
+            line (TCL). It's better not to exceed half of the minimum width.
+        center_region_shrink_ratio (float): The shrink ratio of text center
+            region.
+        level_size_divisors (tuple(int)): The downsample ratio on each level.
+        level_proportion_range (tuple(tuple(int))): The range of text sizes
+            assigned to each level.
+    """
+
+    def __init__(
+        self,
+        fourier_degree=5,
+        resample_step=4.0,
+        center_region_shrink_ratio=0.3,
+        level_size_divisors=(8, 16, 32),
+        level_proportion_range=((0, 0.25), (0.2, 0.65), (0.55, 1.0)),
+        orientation_thr=2.0,
+        **kwargs
+    ):
+
+        super().__init__()
+        assert isinstance(level_size_divisors, tuple)
+        assert isinstance(level_proportion_range, tuple)
+        assert len(level_size_divisors) == len(level_proportion_range)
+        self.fourier_degree = fourier_degree
+        self.resample_step = resample_step
+        self.center_region_shrink_ratio = center_region_shrink_ratio
+        self.level_size_divisors = level_size_divisors
+        self.level_proportion_range = level_proportion_range
+
+        self.orientation_thr = orientation_thr
+
+    def vector_angle(self, vec1, vec2):
+        if vec1.ndim > 1:
+            unit_vec1 = vec1 / (norm(vec1, axis=-1) + 1e-8).reshape((-1, 1))
+        else:
+            unit_vec1 = vec1 / (norm(vec1, axis=-1) + 1e-8)
+        if vec2.ndim > 1:
+            unit_vec2 = vec2 / (norm(vec2, axis=-1) + 1e-8).reshape((-1, 1))
+        else:
+            unit_vec2 = vec2 / (norm(vec2, axis=-1) + 1e-8)
+        return np.arccos(np.clip(np.sum(unit_vec1 * unit_vec2, axis=-1), -1.0, 1.0))
+
+    def resample_line(self, line, n):
+        """Resample n points on a line.
+
+        Args:
+            line (ndarray): The points composing a line.
+            n (int): The resampled points number.
+
+        Returns:
+            resampled_line (ndarray): The points composing the resampled line.
+        """
+
+        assert line.ndim == 2
+        assert line.shape[0] >= 2
+        assert line.shape[1] == 2
+        assert isinstance(n, int)
+        assert n > 0
+
+        length_list = [norm(line[i + 1] - line[i]) for i in range(len(line) - 1)]
+        total_length = sum(length_list)
+        length_cumsum = np.cumsum([0.0] + length_list)
+        delta_length = total_length / (float(n) + 1e-8)
+
+        current_edge_ind = 0
+        resampled_line = [line[0]]
+
+        for i in range(1, n):
+            current_line_len = i * delta_length
+
+            while current_line_len >= length_cumsum[current_edge_ind + 1]:
+                current_edge_ind += 1
+            current_edge_end_shift = current_line_len - length_cumsum[current_edge_ind]
+            end_shift_ratio = current_edge_end_shift / length_list[current_edge_ind]
+            current_point = (
+                line[current_edge_ind]
+                + (line[current_edge_ind + 1] - line[current_edge_ind])
+                * end_shift_ratio
+            )
+            resampled_line.append(current_point)
+
+        resampled_line.append(line[-1])
+        resampled_line = np.array(resampled_line)
+
+        return resampled_line
+
+    def reorder_poly_edge(self, points):
+        """Get the respective points composing head edge, tail edge, top
+        sideline and bottom sideline.
+
+        Args:
+            points (ndarray): The points composing a text polygon.
+
+        Returns:
+            head_edge (ndarray): The two points composing the head edge of text
+                polygon.
+            tail_edge (ndarray): The two points composing the tail edge of text
+                polygon.
+            top_sideline (ndarray): The points composing top curved sideline of
+                text polygon.
+            bot_sideline (ndarray): The points composing bottom curved sideline
+                of text polygon.
+        """
+
+        assert points.ndim == 2
+        assert points.shape[0] >= 4
+        assert points.shape[1] == 2
+
+        head_inds, tail_inds = self.find_head_tail(points, self.orientation_thr)
+        head_edge, tail_edge = points[head_inds], points[tail_inds]
+
+        pad_points = np.vstack([points, points])
+        if tail_inds[1] < 1:
+            tail_inds[1] = len(points)
+        sideline1 = pad_points[head_inds[1] : tail_inds[1]]
+        sideline2 = pad_points[tail_inds[1] : (head_inds[1] + len(points))]
+        sideline_mean_shift = np.mean(sideline1, axis=0) - np.mean(sideline2, axis=0)
+
+        if sideline_mean_shift[1] > 0:
+            top_sideline, bot_sideline = sideline2, sideline1
+        else:
+            top_sideline, bot_sideline = sideline1, sideline2
+
+        return head_edge, tail_edge, top_sideline, bot_sideline
+
+    def find_head_tail(self, points, orientation_thr):
+        """Find the head edge and tail edge of a text polygon.
+
+        Args:
+            points (ndarray): The points composing a text polygon.
+            orientation_thr (float): The threshold for distinguishing between
+                head edge and tail edge among the horizontal and vertical edges
+                of a quadrangle.
+
+        Returns:
+            head_inds (list): The indexes of two points composing head edge.
+            tail_inds (list): The indexes of two points composing tail edge.
+        """
+
+        assert points.ndim == 2
+        assert points.shape[0] >= 4
+        assert points.shape[1] == 2
+        assert isinstance(orientation_thr, float)
+
+        if len(points) > 4:
+            pad_points = np.vstack([points, points[0]])
+            edge_vec = pad_points[1:] - pad_points[:-1]
+
+            theta_sum = []
+            adjacent_vec_theta = []
+            for i, edge_vec1 in enumerate(edge_vec):
+                adjacent_ind = [x % len(edge_vec) for x in [i - 1, i + 1]]
+                adjacent_edge_vec = edge_vec[adjacent_ind]
+                temp_theta_sum = np.sum(self.vector_angle(edge_vec1, adjacent_edge_vec))
+                temp_adjacent_theta = self.vector_angle(
+                    adjacent_edge_vec[0], adjacent_edge_vec[1]
+                )
+                theta_sum.append(temp_theta_sum)
+                adjacent_vec_theta.append(temp_adjacent_theta)
+            theta_sum_score = np.array(theta_sum) / np.pi
+            adjacent_theta_score = np.array(adjacent_vec_theta) / np.pi
+            poly_center = np.mean(points, axis=0)
+            edge_dist = np.maximum(
+                norm(pad_points[1:] - poly_center, axis=-1),
+                norm(pad_points[:-1] - poly_center, axis=-1),
+            )
+            dist_score = edge_dist / np.max(edge_dist)
+            position_score = np.zeros(len(edge_vec))
+            score = 0.5 * theta_sum_score + 0.15 * adjacent_theta_score
+            score += 0.35 * dist_score
+            if len(points) % 2 == 0:
+                position_score[(len(score) // 2 - 1)] += 1
+                position_score[-1] += 1
+            score += 0.1 * position_score
+            pad_score = np.concatenate([score, score])
+            score_matrix = np.zeros((len(score), len(score) - 3))
+            x = np.arange(len(score) - 3) / float(len(score) - 4)
+            gaussian = (
+                1.0
+                / (np.sqrt(2.0 * np.pi) * 0.5)
+                * np.exp(-np.power((x - 0.5) / 0.5, 2.0) / 2)
+            )
+            gaussian = gaussian / np.max(gaussian)
+            for i in range(len(score)):
+                score_matrix[i, :] = (
+                    score[i]
+                    + pad_score[(i + 2) : (i + len(score) - 1)] * gaussian * 0.3
+                )
+
+            head_start, tail_increment = np.unravel_index(
+                score_matrix.argmax(), score_matrix.shape
+            )
+            tail_start = (head_start + tail_increment + 2) % len(points)
+            head_end = (head_start + 1) % len(points)
+            tail_end = (tail_start + 1) % len(points)
+
+            if head_end > tail_end:
+                head_start, tail_start = tail_start, head_start
+                head_end, tail_end = tail_end, head_end
+            head_inds = [head_start, head_end]
+            tail_inds = [tail_start, tail_end]
+        else:
+            if vector_slope(points[1] - points[0]) + vector_slope(
+                points[3] - points[2]
+            ) < vector_slope(points[2] - points[1]) + vector_slope(
+                points[0] - points[3]
+            ):
+                horizontal_edge_inds = [[0, 1], [2, 3]]
+                vertical_edge_inds = [[3, 0], [1, 2]]
+            else:
+                horizontal_edge_inds = [[3, 0], [1, 2]]
+                vertical_edge_inds = [[0, 1], [2, 3]]
+
+            vertical_len_sum = norm(
+                points[vertical_edge_inds[0][0]] - points[vertical_edge_inds[0][1]]
+            ) + norm(
+                points[vertical_edge_inds[1][0]] - points[vertical_edge_inds[1][1]]
+            )
+            horizontal_len_sum = norm(
+                points[horizontal_edge_inds[0][0]] - points[horizontal_edge_inds[0][1]]
+            ) + norm(
+                points[horizontal_edge_inds[1][0]] - points[horizontal_edge_inds[1][1]]
+            )
+
+            if vertical_len_sum > horizontal_len_sum * orientation_thr:
+                head_inds = horizontal_edge_inds[0]
+                tail_inds = horizontal_edge_inds[1]
+            else:
+                head_inds = vertical_edge_inds[0]
+                tail_inds = vertical_edge_inds[1]
+
+        return head_inds, tail_inds
+
+    def resample_sidelines(self, sideline1, sideline2, resample_step):
+        """Resample two sidelines to be of the same points number according to
+        step size.
+
+        Args:
+            sideline1 (ndarray): The points composing a sideline of a text
+                polygon.
+            sideline2 (ndarray): The points composing another sideline of a
+                text polygon.
+            resample_step (float): The resampled step size.
+
+        Returns:
+            resampled_line1 (ndarray): The resampled line 1.
+            resampled_line2 (ndarray): The resampled line 2.
+        """
+
+        assert sideline1.ndim == sideline2.ndim == 2
+        assert sideline1.shape[1] == sideline2.shape[1] == 2
+        assert sideline1.shape[0] >= 2
+        assert sideline2.shape[0] >= 2
+        assert isinstance(resample_step, float)
+
+        length1 = sum(
+            [norm(sideline1[i + 1] - sideline1[i]) for i in range(len(sideline1) - 1)]
+        )
+        length2 = sum(
+            [norm(sideline2[i + 1] - sideline2[i]) for i in range(len(sideline2) - 1)]
+        )
+
+        total_length = (length1 + length2) / 2
+        resample_point_num = max(int(float(total_length) / resample_step), 1)
+
+        resampled_line1 = self.resample_line(sideline1, resample_point_num)
+        resampled_line2 = self.resample_line(sideline2, resample_point_num)
+
+        return resampled_line1, resampled_line2
+
+    def generate_center_region_mask(self, img_size, text_polys):
+        """Generate text center region mask.
+
+        Args:
+            img_size (tuple): The image size of (height, width).
+            text_polys (list[list[ndarray]]): The list of text polygons.
+
+        Returns:
+            center_region_mask (ndarray): The text center region mask.
+        """
+
+        assert isinstance(img_size, tuple)
+        # assert check_argument.is_2dlist(text_polys)
+
+        h, w = img_size
+
+        center_region_mask = np.zeros((h, w), np.uint8)
+
+        center_region_boxes = []
+        for poly in text_polys:
+            # assert len(poly) == 1
+            polygon_points = poly.reshape(-1, 2)
+            _, _, top_line, bot_line = self.reorder_poly_edge(polygon_points)
+            resampled_top_line, resampled_bot_line = self.resample_sidelines(
+                top_line, bot_line, self.resample_step
+            )
+            resampled_bot_line = resampled_bot_line[::-1]
+            center_line = (resampled_top_line + resampled_bot_line) / 2
+
+            line_head_shrink_len = (
+                norm(resampled_top_line[0] - resampled_bot_line[0]) / 4.0
+            )
+            line_tail_shrink_len = (
+                norm(resampled_top_line[-1] - resampled_bot_line[-1]) / 4.0
+            )
+            head_shrink_num = int(line_head_shrink_len // self.resample_step)
+            tail_shrink_num = int(line_tail_shrink_len // self.resample_step)
+            if len(center_line) > head_shrink_num + tail_shrink_num + 2:
+                center_line = center_line[
+                    head_shrink_num : len(center_line) - tail_shrink_num
+                ]
+                resampled_top_line = resampled_top_line[
+                    head_shrink_num : len(resampled_top_line) - tail_shrink_num
+                ]
+                resampled_bot_line = resampled_bot_line[
+                    head_shrink_num : len(resampled_bot_line) - tail_shrink_num
+                ]
+
+            for i in range(0, len(center_line) - 1):
+                tl = (
+                    center_line[i]
+                    + (resampled_top_line[i] - center_line[i])
+                    * self.center_region_shrink_ratio
+                )
+                tr = (
+                    center_line[i + 1]
+                    + (resampled_top_line[i + 1] - center_line[i + 1])
+                    * self.center_region_shrink_ratio
+                )
+                br = (
+                    center_line[i + 1]
+                    + (resampled_bot_line[i + 1] - center_line[i + 1])
+                    * self.center_region_shrink_ratio
+                )
+                bl = (
+                    center_line[i]
+                    + (resampled_bot_line[i] - center_line[i])
+                    * self.center_region_shrink_ratio
+                )
+                current_center_box = np.vstack([tl, tr, br, bl]).astype(np.int32)
+                center_region_boxes.append(current_center_box)
+
+        cv2.fillPoly(center_region_mask, center_region_boxes, 1)
+        return center_region_mask
+
+    def resample_polygon(self, polygon, n=400):
+        """Resample one polygon with n points on its boundary.
+
+        Args:
+            polygon (list[float]): The input polygon.
+            n (int): The number of resampled points.
+        Returns:
+            resampled_polygon (list[float]): The resampled polygon.
+        """
+        length = []
+
+        for i in range(len(polygon)):
+            p1 = polygon[i]
+            if i == len(polygon) - 1:
+                p2 = polygon[0]
+            else:
+                p2 = polygon[i + 1]
+            length.append(((p1[0] - p2[0]) ** 2 + (p1[1] - p2[1]) ** 2) ** 0.5)
+
+        total_length = sum(length)
+        n_on_each_line = (np.array(length) / (total_length + 1e-8)) * n
+        n_on_each_line = n_on_each_line.astype(np.int32)
+        new_polygon = []
+
+        for i in range(len(polygon)):
+            num = n_on_each_line[i]
+            p1 = polygon[i]
+            if i == len(polygon) - 1:
+                p2 = polygon[0]
+            else:
+                p2 = polygon[i + 1]
+
+            if num == 0:
+                continue
+
+            dxdy = (p2 - p1) / num
+            for j in range(num):
+                point = p1 + dxdy * j
+                new_polygon.append(point)
+
+        return np.array(new_polygon)
+
+    def normalize_polygon(self, polygon):
+        """Normalize one polygon so that its start point is at right most.
+
+        Args:
+            polygon (list[float]): The origin polygon.
+        Returns:
+            new_polygon (lost[float]): The polygon with start point at right.
+        """
+        temp_polygon = polygon - polygon.mean(axis=0)
+        x = np.abs(temp_polygon[:, 0])
+        y = temp_polygon[:, 1]
+        index_x = np.argsort(x)
+        index_y = np.argmin(y[index_x[:8]])
+        index = index_x[index_y]
+        new_polygon = np.concatenate([polygon[index:], polygon[:index]])
+        return new_polygon
+
+    def poly2fourier(self, polygon, fourier_degree):
+        """Perform Fourier transformation to generate Fourier coefficients ck
+        from polygon.
+
+        Args:
+            polygon (ndarray): An input polygon.
+            fourier_degree (int): The maximum Fourier degree K.
+        Returns:
+            c (ndarray(complex)): Fourier coefficients.
+        """
+        points = polygon[:, 0] + polygon[:, 1] * 1j
+        c_fft = fft(points) / len(points)
+        c = np.hstack((c_fft[-fourier_degree:], c_fft[: fourier_degree + 1]))
+        return c
+
+    def clockwise(self, c, fourier_degree):
+        """Make sure the polygon reconstructed from Fourier coefficients c in
+        the clockwise direction.
+
+        Args:
+            polygon (list[float]): The origin polygon.
+        Returns:
+            new_polygon (lost[float]): The polygon in clockwise point order.
+        """
+        if np.abs(c[fourier_degree + 1]) > np.abs(c[fourier_degree - 1]):
+            return c
+        elif np.abs(c[fourier_degree + 1]) < np.abs(c[fourier_degree - 1]):
+            return c[::-1]
+        else:
+            if np.abs(c[fourier_degree + 2]) > np.abs(c[fourier_degree - 2]):
+                return c
+            else:
+                return c[::-1]
+
+    def cal_fourier_signature(self, polygon, fourier_degree):
+        """Calculate Fourier signature from input polygon.
+
+        Args:
+              polygon (ndarray): The input polygon.
+              fourier_degree (int): The maximum Fourier degree K.
+        Returns:
+              fourier_signature (ndarray): An array shaped (2k+1, 2) containing
+                  real part and image part of 2k+1 Fourier coefficients.
+        """
+        resampled_polygon = self.resample_polygon(polygon)
+        resampled_polygon = self.normalize_polygon(resampled_polygon)
+
+        fourier_coeff = self.poly2fourier(resampled_polygon, fourier_degree)
+        fourier_coeff = self.clockwise(fourier_coeff, fourier_degree)
+
+        real_part = np.real(fourier_coeff).reshape((-1, 1))
+        image_part = np.imag(fourier_coeff).reshape((-1, 1))
+        fourier_signature = np.hstack([real_part, image_part])
+
+        return fourier_signature
+
+    def generate_fourier_maps(self, img_size, text_polys):
+        """Generate Fourier coefficient maps.
+
+        Args:
+            img_size (tuple): The image size of (height, width).
+            text_polys (list[list[ndarray]]): The list of text polygons.
+
+        Returns:
+            fourier_real_map (ndarray): The Fourier coefficient real part maps.
+            fourier_image_map (ndarray): The Fourier coefficient image part
+                maps.
+        """
+
+        assert isinstance(img_size, tuple)
+
+        h, w = img_size
+        k = self.fourier_degree
+        real_map = np.zeros((k * 2 + 1, h, w), dtype=np.float32)
+        imag_map = np.zeros((k * 2 + 1, h, w), dtype=np.float32)
+
+        for poly in text_polys:
+            mask = np.zeros((h, w), dtype=np.uint8)
+            polygon = np.array(poly).reshape((1, -1, 2))
+            cv2.fillPoly(mask, polygon.astype(np.int32), 1)
+            fourier_coeff = self.cal_fourier_signature(polygon[0], k)
+            for i in range(-k, k + 1):
+                if i != 0:
+                    real_map[i + k, :, :] = (
+                        mask * fourier_coeff[i + k, 0]
+                        + (1 - mask) * real_map[i + k, :, :]
+                    )
+                    imag_map[i + k, :, :] = (
+                        mask * fourier_coeff[i + k, 1]
+                        + (1 - mask) * imag_map[i + k, :, :]
+                    )
+                else:
+                    yx = np.argwhere(mask > 0.5)
+                    k_ind = np.ones((len(yx)), dtype=np.int64) * k
+                    y, x = yx[:, 0], yx[:, 1]
+                    real_map[k_ind, y, x] = fourier_coeff[k, 0] - x
+                    imag_map[k_ind, y, x] = fourier_coeff[k, 1] - y
+
+        return real_map, imag_map
+
+    def generate_text_region_mask(self, img_size, text_polys):
+        """Generate text center region mask and geometry attribute maps.
+
+        Args:
+            img_size (tuple): The image size (height, width).
+            text_polys (list[list[ndarray]]): The list of text polygons.
+
+        Returns:
+            text_region_mask (ndarray): The text region mask.
+        """
+
+        assert isinstance(img_size, tuple)
+
+        h, w = img_size
+        text_region_mask = np.zeros((h, w), dtype=np.uint8)
+
+        for poly in text_polys:
+            polygon = np.array(poly, dtype=np.int32).reshape((1, -1, 2))
+            cv2.fillPoly(text_region_mask, polygon, 1)
+
+        return text_region_mask
+
+    def generate_effective_mask(self, mask_size: tuple, polygons_ignore):
+        """Generate effective mask by setting the ineffective regions to 0 and
+        effective regions to 1.
+
+        Args:
+            mask_size (tuple): The mask size.
+            polygons_ignore (list[[ndarray]]: The list of ignored text
+                polygons.
+
+        Returns:
+            mask (ndarray): The effective mask of (height, width).
+        """
+
+        mask = np.ones(mask_size, dtype=np.uint8)
+
+        for poly in polygons_ignore:
+            instance = poly.reshape(-1, 2).astype(np.int32).reshape(1, -1, 2)
+            cv2.fillPoly(mask, instance, 0)
+
+        return mask
+
+    def generate_level_targets(self, img_size, text_polys, ignore_polys):
+        """Generate ground truth target on each level.
+
+        Args:
+            img_size (list[int]): Shape of input image.
+            text_polys (list[list[ndarray]]): A list of ground truth polygons.
+            ignore_polys (list[list[ndarray]]): A list of ignored polygons.
+        Returns:
+            level_maps (list(ndarray)): A list of ground target on each level.
+        """
+        h, w = img_size
+        lv_size_divs = self.level_size_divisors
+        lv_proportion_range = self.level_proportion_range
+        lv_text_polys = [[] for i in range(len(lv_size_divs))]
+        lv_ignore_polys = [[] for i in range(len(lv_size_divs))]
+        level_maps = []
+        for poly in text_polys:
+            polygon = np.array(poly, dtype=np.int).reshape((1, -1, 2))
+            _, _, box_w, box_h = cv2.boundingRect(polygon)
+            proportion = max(box_h, box_w) / (h + 1e-8)
+
+            for ind, proportion_range in enumerate(lv_proportion_range):
+                if proportion_range[0] < proportion < proportion_range[1]:
+                    lv_text_polys[ind].append(poly / lv_size_divs[ind])
+
+        for ignore_poly in ignore_polys:
+            polygon = np.array(ignore_poly, dtype=np.int).reshape((1, -1, 2))
+            _, _, box_w, box_h = cv2.boundingRect(polygon)
+            proportion = max(box_h, box_w) / (h + 1e-8)
+
+            for ind, proportion_range in enumerate(lv_proportion_range):
+                if proportion_range[0] < proportion < proportion_range[1]:
+                    lv_ignore_polys[ind].append(ignore_poly / lv_size_divs[ind])
+
+        for ind, size_divisor in enumerate(lv_size_divs):
+            current_level_maps = []
+            level_img_size = (h // size_divisor, w // size_divisor)
+
+            text_region = self.generate_text_region_mask(
+                level_img_size, lv_text_polys[ind]
+            )[None]
+            current_level_maps.append(text_region)
+
+            center_region = self.generate_center_region_mask(
+                level_img_size, lv_text_polys[ind]
+            )[None]
+            current_level_maps.append(center_region)
+
+            effective_mask = self.generate_effective_mask(
+                level_img_size, lv_ignore_polys[ind]
+            )[None]
+            current_level_maps.append(effective_mask)
+
+            fourier_real_map, fourier_image_maps = self.generate_fourier_maps(
+                level_img_size, lv_text_polys[ind]
+            )
+            current_level_maps.append(fourier_real_map)
+            current_level_maps.append(fourier_image_maps)
+
+            level_maps.append(np.concatenate(current_level_maps))
+
+        return level_maps
+
+    def generate_targets(self, results):
+        """Generate the ground truth targets for FCENet.
+
+        Args:
+            results (dict): The input result dictionary.
+
+        Returns:
+            results (dict): The output result dictionary.
+        """
+
+        assert isinstance(results, dict)
+        image = results["image"]
+        polygons = results["polys"]
+        ignore_tags = results["ignore_tags"]
+        h, w, _ = image.shape
+
+        polygon_masks = []
+        polygon_masks_ignore = []
+        for tag, polygon in zip(ignore_tags, polygons):
+            if tag is True:
+                polygon_masks_ignore.append(polygon)
+            else:
+                polygon_masks.append(polygon)
+
+        level_maps = self.generate_level_targets(
+            (h, w), polygon_masks, polygon_masks_ignore
+        )
+
+        mapping = {
+            "p3_maps": level_maps[0],
+            "p4_maps": level_maps[1],
+            "p5_maps": level_maps[2],
+        }
+        for key, value in mapping.items():
+            results[key] = value
+
+        return results
+
+    def __call__(self, results):
+        results = self.generate_targets(results)
+        return results

ocr/ppocr/data/imaug/gen_table_mask.py

@@ -0,0 +1,228 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import cv2
+import numpy as np
+
+
+class GenTableMask(object):
+    """gen table mask"""
+
+    def __init__(self, shrink_h_max, shrink_w_max, mask_type=0, **kwargs):
+        self.shrink_h_max = 5
+        self.shrink_w_max = 5
+        self.mask_type = mask_type
+
+    def projection(self, erosion, h, w, spilt_threshold=0):
+        # 水平投影
+        projection_map = np.ones_like(erosion)
+        project_val_array = [0 for _ in range(0, h)]
+
+        for j in range(0, h):
+            for i in range(0, w):
+                if erosion[j, i] == 255:
+                    project_val_array[j] += 1
+        # 根据数组，获取切割点
+        start_idx = 0  # 记录进入字符区的索引
+        end_idx = 0  # 记录进入空白区域的索引
+        in_text = False  # 是否遍历到了字符区内
+        box_list = []
+        for i in range(len(project_val_array)):
+            if in_text == False and project_val_array[i] > spilt_threshold:  # 进入字符区了
+                in_text = True
+                start_idx = i
+            elif project_val_array[i] <= spilt_threshold and in_text == True:  # 进入空白区了
+                end_idx = i
+                in_text = False
+                if end_idx - start_idx <= 2:
+                    continue
+                box_list.append((start_idx, end_idx + 1))
+
+        if in_text:
+            box_list.append((start_idx, h - 1))
+        # 绘制投影直方图
+        for j in range(0, h):
+            for i in range(0, project_val_array[j]):
+                projection_map[j, i] = 0
+        return box_list, projection_map
+
+    def projection_cx(self, box_img):
+        box_gray_img = cv2.cvtColor(box_img, cv2.COLOR_BGR2GRAY)
+        h, w = box_gray_img.shape
+        # 灰度图片进行二值化处理
+        ret, thresh1 = cv2.threshold(box_gray_img, 200, 255, cv2.THRESH_BINARY_INV)
+        # 纵向腐蚀
+        if h < w:
+            kernel = np.ones((2, 1), np.uint8)
+            erode = cv2.erode(thresh1, kernel, iterations=1)
+        else:
+            erode = thresh1
+        # 水平膨胀
+        kernel = np.ones((1, 5), np.uint8)
+        erosion = cv2.dilate(erode, kernel, iterations=1)
+        # 水平投影
+        projection_map = np.ones_like(erosion)
+        project_val_array = [0 for _ in range(0, h)]
+
+        for j in range(0, h):
+            for i in range(0, w):
+                if erosion[j, i] == 255:
+                    project_val_array[j] += 1
+        # 根据数组，获取切割点
+        start_idx = 0  # 记录进入字符区的索引
+        end_idx = 0  # 记录进入空白区域的索引
+        in_text = False  # 是否遍历到了字符区内
+        box_list = []
+        spilt_threshold = 0
+        for i in range(len(project_val_array)):
+            if in_text == False and project_val_array[i] > spilt_threshold:  # 进入字符区了
+                in_text = True
+                start_idx = i
+            elif project_val_array[i] <= spilt_threshold and in_text == True:  # 进入空白区了
+                end_idx = i
+                in_text = False
+                if end_idx - start_idx <= 2:
+                    continue
+                box_list.append((start_idx, end_idx + 1))
+
+        if in_text:
+            box_list.append((start_idx, h - 1))
+        # 绘制投影直方图
+        for j in range(0, h):
+            for i in range(0, project_val_array[j]):
+                projection_map[j, i] = 0
+        split_bbox_list = []
+        if len(box_list) > 1:
+            for i, (h_start, h_end) in enumerate(box_list):
+                if i == 0:
+                    h_start = 0
+                if i == len(box_list):
+                    h_end = h
+                word_img = erosion[h_start : h_end + 1, :]
+                word_h, word_w = word_img.shape
+                w_split_list, w_projection_map = self.projection(
+                    word_img.T, word_w, word_h
+                )
+                w_start, w_end = w_split_list[0][0], w_split_list[-1][1]
+                if h_start > 0:
+                    h_start -= 1
+                h_end += 1
+                word_img = box_img[h_start : h_end + 1 :, w_start : w_end + 1, :]
+                split_bbox_list.append([w_start, h_start, w_end, h_end])
+        else:
+            split_bbox_list.append([0, 0, w, h])
+        return split_bbox_list
+
+    def shrink_bbox(self, bbox):
+        left, top, right, bottom = bbox
+        sh_h = min(max(int((bottom - top) * 0.1), 1), self.shrink_h_max)
+        sh_w = min(max(int((right - left) * 0.1), 1), self.shrink_w_max)
+        left_new = left + sh_w
+        right_new = right - sh_w
+        top_new = top + sh_h
+        bottom_new = bottom - sh_h
+        if left_new >= right_new:
+            left_new = left
+            right_new = right
+        if top_new >= bottom_new:
+            top_new = top
+            bottom_new = bottom
+        return [left_new, top_new, right_new, bottom_new]
+
+    def __call__(self, data):
+        img = data["image"]
+        cells = data["cells"]
+        height, width = img.shape[0:2]
+        if self.mask_type == 1:
+            mask_img = np.zeros((height, width), dtype=np.float32)
+        else:
+            mask_img = np.zeros((height, width, 3), dtype=np.float32)
+        cell_num = len(cells)
+        for cno in range(cell_num):
+            if "bbox" in cells[cno]:
+                bbox = cells[cno]["bbox"]
+                left, top, right, bottom = bbox
+                box_img = img[top:bottom, left:right, :].copy()
+                split_bbox_list = self.projection_cx(box_img)
+                for sno in range(len(split_bbox_list)):
+                    split_bbox_list[sno][0] += left
+                    split_bbox_list[sno][1] += top
+                    split_bbox_list[sno][2] += left
+                    split_bbox_list[sno][3] += top
+
+                for sno in range(len(split_bbox_list)):
+                    left, top, right, bottom = split_bbox_list[sno]
+                    left, top, right, bottom = self.shrink_bbox(
+                        [left, top, right, bottom]
+                    )
+                    if self.mask_type == 1:
+                        mask_img[top:bottom, left:right] = 1.0
+                        data["mask_img"] = mask_img
+                    else:
+                        mask_img[top:bottom, left:right, :] = (255, 255, 255)
+                        data["image"] = mask_img
+        return data
+
+
+class ResizeTableImage(object):
+    def __init__(self, max_len, **kwargs):
+        super(ResizeTableImage, self).__init__()
+        self.max_len = max_len
+
+    def get_img_bbox(self, cells):
+        bbox_list = []
+        if len(cells) == 0:
+            return bbox_list
+        cell_num = len(cells)
+        for cno in range(cell_num):
+            if "bbox" in cells[cno]:
+                bbox = cells[cno]["bbox"]
+                bbox_list.append(bbox)
+        return bbox_list
+
+    def resize_img_table(self, img, bbox_list, max_len):
+        height, width = img.shape[0:2]
+        ratio = max_len / (max(height, width) * 1.0)
+        resize_h = int(height * ratio)
+        resize_w = int(width * ratio)
+        img_new = cv2.resize(img, (resize_w, resize_h))
+        bbox_list_new = []
+        for bno in range(len(bbox_list)):
+            left, top, right, bottom = bbox_list[bno].copy()
+            left = int(left * ratio)
+            top = int(top * ratio)
+            right = int(right * ratio)
+            bottom = int(bottom * ratio)
+            bbox_list_new.append([left, top, right, bottom])
+        return img_new, bbox_list_new
+
+    def __call__(self, data):
+        img = data["image"]
+        if "cells" not in data:
+            cells = []
+        else:
+            cells = data["cells"]
+        bbox_list = self.get_img_bbox(cells)
+        img_new, bbox_list_new = self.resize_img_table(img, bbox_list, self.max_len)
+        data["image"] = img_new
+        cell_num = len(cells)
+        bno = 0
+        for cno in range(cell_num):
+            if "bbox" in data["cells"][cno]:
+                data["cells"][cno]["bbox"] = bbox_list_new[bno]
+                bno += 1
+        data["max_len"] = self.max_len
+        return data
+
+
+class PaddingTableImage(object):
+    def __init__(self, **kwargs):
+        super(PaddingTableImage, self).__init__()
+
+    def __call__(self, data):
+        img = data["image"]
+        max_len = data["max_len"]
+        padding_img = np.zeros((max_len, max_len, 3), dtype=np.float32)
+        height, width = img.shape[0:2]
+        padding_img[0:height, 0:width, :] = img.copy()
+        data["image"] = padding_img
+        return data

ocr/ppocr/data/imaug/iaa_augment.py

@@ -0,0 +1,72 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import imgaug
+import imgaug.augmenters as iaa
+import numpy as np
+
+
+class AugmenterBuilder(object):
+    def __init__(self):
+        pass
+
+    def build(self, args, root=True):
+        if args is None or len(args) == 0:
+            return None
+        elif isinstance(args, list):
+            if root:
+                sequence = [self.build(value, root=False) for value in args]
+                return iaa.Sequential(sequence)
+            else:
+                return getattr(iaa, args[0])(
+                    *[self.to_tuple_if_list(a) for a in args[1:]]
+                )
+        elif isinstance(args, dict):
+            cls = getattr(iaa, args["type"])
+            return cls(**{k: self.to_tuple_if_list(v) for k, v in args["args"].items()})
+        else:
+            raise RuntimeError("unknown augmenter arg: " + str(args))
+
+    def to_tuple_if_list(self, obj):
+        if isinstance(obj, list):
+            return tuple(obj)
+        return obj
+
+
+class IaaAugment:
+    def __init__(self, augmenter_args=None, **kwargs):
+        if augmenter_args is None:
+            augmenter_args = [
+                {"type": "Fliplr", "args": {"p": 0.5}},
+                {"type": "Affine", "args": {"rotate": [-10, 10]}},
+                {"type": "Resize", "args": {"size": [0.5, 3]}},
+            ]
+        self.augmenter = AugmenterBuilder().build(augmenter_args)
+
+    def __call__(self, data):
+        image = data["image"]
+        shape = image.shape
+
+        if self.augmenter:
+            aug = self.augmenter.to_deterministic()
+            data["image"] = aug.augment_image(image)
+            data = self.may_augment_annotation(aug, data, shape)
+        return data
+
+    def may_augment_annotation(self, aug, data, shape):
+        if aug is None:
+            return data
+
+        line_polys = []
+        for poly in data["polys"]:
+            new_poly = self.may_augment_poly(aug, shape, poly)
+            line_polys.append(new_poly)
+        data["polys"] = np.array(line_polys)
+        return data
+
+    def may_augment_poly(self, aug, img_shape, poly):
+        keypoints = [imgaug.Keypoint(p[0], p[1]) for p in poly]
+        keypoints = aug.augment_keypoints(
+            [imgaug.KeypointsOnImage(keypoints, shape=img_shape)]
+        )[0].keypoints
+        poly = [(p.x, p.y) for p in keypoints]
+        return poly

ocr/ppocr/data/imaug/label_ops.py

@@ -0,0 +1,1046 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import copy
+import json
+
+import numpy as np
+from shapely.geometry import LineString, Point, Polygon
+
+
+class ClsLabelEncode(object):
+    def __init__(self, label_list, **kwargs):
+        self.label_list = label_list
+
+    def __call__(self, data):
+        label = data["label"]
+        if label not in self.label_list:
+            return None
+        label = self.label_list.index(label)
+        data["label"] = label
+        return data
+
+
+class DetLabelEncode(object):
+    def __init__(self, **kwargs):
+        pass
+
+    def __call__(self, data):
+        label = data["label"]
+        label = json.loads(label)
+        nBox = len(label)
+        boxes, txts, txt_tags = [], [], []
+        for bno in range(0, nBox):
+            box = label[bno]["points"]
+            txt = label[bno]["transcription"]
+            boxes.append(box)
+            txts.append(txt)
+            if txt in ["*", "###"]:
+                txt_tags.append(True)
+            else:
+                txt_tags.append(False)
+        if len(boxes) == 0:
+            return None
+        boxes = self.expand_points_num(boxes)
+        boxes = np.array(boxes, dtype=np.float32)
+        txt_tags = np.array(txt_tags, dtype=np.bool)
+
+        data["polys"] = boxes
+        data["texts"] = txts
+        data["ignore_tags"] = txt_tags
+        return data
+
+    def order_points_clockwise(self, pts):
+        rect = np.zeros((4, 2), dtype="float32")
+        s = pts.sum(axis=1)
+        rect[0] = pts[np.argmin(s)]
+        rect[2] = pts[np.argmax(s)]
+        diff = np.diff(pts, axis=1)
+        rect[1] = pts[np.argmin(diff)]
+        rect[3] = pts[np.argmax(diff)]
+        return rect
+
+    def expand_points_num(self, boxes):
+        max_points_num = 0
+        for box in boxes:
+            if len(box) > max_points_num:
+                max_points_num = len(box)
+        ex_boxes = []
+        for box in boxes:
+            ex_box = box + [box[-1]] * (max_points_num - len(box))
+            ex_boxes.append(ex_box)
+        return ex_boxes
+
+
+class BaseRecLabelEncode(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(self, max_text_length, character_dict_path=None, use_space_char=False):
+
+        self.max_text_len = max_text_length
+        self.beg_str = "sos"
+        self.end_str = "eos"
+        self.lower = False
+
+        if character_dict_path is None:
+            self.character_str = "0123456789abcdefghijklmnopqrstuvwxyz"
+            dict_character = list(self.character_str)
+            self.lower = True
+        else:
+            self.character_str = []
+            with open(character_dict_path, "rb") as fin:
+                lines = fin.readlines()
+                for line in lines:
+                    line = line.decode("utf-8").strip("\n").strip("\r\n")
+                    self.character_str.append(line)
+            if use_space_char:
+                self.character_str.append(" ")
+            dict_character = list(self.character_str)
+        dict_character = self.add_special_char(dict_character)
+        self.dict = {}
+        for i, char in enumerate(dict_character):
+            self.dict[char] = i
+        self.character = dict_character
+
+    def add_special_char(self, dict_character):
+        return dict_character
+
+    def encode(self, text):
+        """convert text-label into text-index.
+        input:
+            text: text labels of each image. [batch_size]
+
+        output:
+            text: concatenated text index for CTCLoss.
+                    [sum(text_lengths)] = [text_index_0 + text_index_1 + ... + text_index_(n - 1)]
+            length: length of each text. [batch_size]
+        """
+        if len(text) == 0 or len(text) > self.max_text_len:
+            return None
+        if self.lower:
+            text = text.lower()
+        text_list = []
+        for char in text:
+            if char not in self.dict:
+                continue
+            text_list.append(self.dict[char])
+        if len(text_list) == 0:
+            return None
+        return text_list
+
+
+class NRTRLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+
+        super(NRTRLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        if text is None:
+            return None
+        if len(text) >= self.max_text_len - 1:
+            return None
+        data["length"] = np.array(len(text))
+        text.insert(0, 2)
+        text.append(3)
+        text = text + [0] * (self.max_text_len - len(text))
+        data["label"] = np.array(text)
+        return data
+
+    def add_special_char(self, dict_character):
+        dict_character = ["blank", "<unk>", "<s>", "</s>"] + dict_character
+        return dict_character
+
+
+class CTCLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(CTCLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        if text is None:
+            return None
+        data["length"] = np.array(len(text))
+        text = text + [0] * (self.max_text_len - len(text))
+        data["label"] = np.array(text)
+
+        label = [0] * len(self.character)
+        for x in text:
+            label[x] += 1
+        data["label_ace"] = np.array(label)
+        return data
+
+    def add_special_char(self, dict_character):
+        dict_character = ["blank"] + dict_character
+        return dict_character
+
+
+class E2ELabelEncodeTest(BaseRecLabelEncode):
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(E2ELabelEncodeTest, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def __call__(self, data):
+        import json
+
+        padnum = len(self.dict)
+        label = data["label"]
+        label = json.loads(label)
+        nBox = len(label)
+        boxes, txts, txt_tags = [], [], []
+        for bno in range(0, nBox):
+            box = label[bno]["points"]
+            txt = label[bno]["transcription"]
+            boxes.append(box)
+            txts.append(txt)
+            if txt in ["*", "###"]:
+                txt_tags.append(True)
+            else:
+                txt_tags.append(False)
+        boxes = np.array(boxes, dtype=np.float32)
+        txt_tags = np.array(txt_tags, dtype=np.bool)
+        data["polys"] = boxes
+        data["ignore_tags"] = txt_tags
+        temp_texts = []
+        for text in txts:
+            text = text.lower()
+            text = self.encode(text)
+            if text is None:
+                return None
+            text = text + [padnum] * (self.max_text_len - len(text))  # use 36 to pad
+            temp_texts.append(text)
+        data["texts"] = np.array(temp_texts)
+        return data
+
+
+class E2ELabelEncodeTrain(object):
+    def __init__(self, **kwargs):
+        pass
+
+    def __call__(self, data):
+        import json
+
+        label = data["label"]
+        label = json.loads(label)
+        nBox = len(label)
+        boxes, txts, txt_tags = [], [], []
+        for bno in range(0, nBox):
+            box = label[bno]["points"]
+            txt = label[bno]["transcription"]
+            boxes.append(box)
+            txts.append(txt)
+            if txt in ["*", "###"]:
+                txt_tags.append(True)
+            else:
+                txt_tags.append(False)
+        boxes = np.array(boxes, dtype=np.float32)
+        txt_tags = np.array(txt_tags, dtype=np.bool)
+
+        data["polys"] = boxes
+        data["texts"] = txts
+        data["ignore_tags"] = txt_tags
+        return data
+
+
+class KieLabelEncode(object):
+    def __init__(self, character_dict_path, norm=10, directed=False, **kwargs):
+        super(KieLabelEncode, self).__init__()
+        self.dict = dict({"": 0})
+        with open(character_dict_path, "r", encoding="utf-8") as fr:
+            idx = 1
+            for line in fr:
+                char = line.strip()
+                self.dict[char] = idx
+                idx += 1
+        self.norm = norm
+        self.directed = directed
+
+    def compute_relation(self, boxes):
+        """Compute relation between every two boxes."""
+        x1s, y1s = boxes[:, 0:1], boxes[:, 1:2]
+        x2s, y2s = boxes[:, 4:5], boxes[:, 5:6]
+        ws, hs = x2s - x1s + 1, np.maximum(y2s - y1s + 1, 1)
+        dxs = (x1s[:, 0][None] - x1s) / self.norm
+        dys = (y1s[:, 0][None] - y1s) / self.norm
+        xhhs, xwhs = hs[:, 0][None] / hs, ws[:, 0][None] / hs
+        whs = ws / hs + np.zeros_like(xhhs)
+        relations = np.stack([dxs, dys, whs, xhhs, xwhs], -1)
+        bboxes = np.concatenate([x1s, y1s, x2s, y2s], -1).astype(np.float32)
+        return relations, bboxes
+
+    def pad_text_indices(self, text_inds):
+        """Pad text index to same length."""
+        max_len = 300
+        recoder_len = max([len(text_ind) for text_ind in text_inds])
+        padded_text_inds = -np.ones((len(text_inds), max_len), np.int32)
+        for idx, text_ind in enumerate(text_inds):
+            padded_text_inds[idx, : len(text_ind)] = np.array(text_ind)
+        return padded_text_inds, recoder_len
+
+    def list_to_numpy(self, ann_infos):
+        """Convert bboxes, relations, texts and labels to ndarray."""
+        boxes, text_inds = ann_infos["points"], ann_infos["text_inds"]
+        boxes = np.array(boxes, np.int32)
+        relations, bboxes = self.compute_relation(boxes)
+
+        labels = ann_infos.get("labels", None)
+        if labels is not None:
+            labels = np.array(labels, np.int32)
+            edges = ann_infos.get("edges", None)
+            if edges is not None:
+                labels = labels[:, None]
+                edges = np.array(edges)
+                edges = (edges[:, None] == edges[None, :]).astype(np.int32)
+                if self.directed:
+                    edges = (edges & labels == 1).astype(np.int32)
+                np.fill_diagonal(edges, -1)
+                labels = np.concatenate([labels, edges], -1)
+        padded_text_inds, recoder_len = self.pad_text_indices(text_inds)
+        max_num = 300
+        temp_bboxes = np.zeros([max_num, 4])
+        h, _ = bboxes.shape
+        temp_bboxes[:h, :] = bboxes
+
+        temp_relations = np.zeros([max_num, max_num, 5])
+        temp_relations[:h, :h, :] = relations
+
+        temp_padded_text_inds = np.zeros([max_num, max_num])
+        temp_padded_text_inds[:h, :] = padded_text_inds
+
+        temp_labels = np.zeros([max_num, max_num])
+        temp_labels[:h, : h + 1] = labels
+
+        tag = np.array([h, recoder_len])
+        return dict(
+            image=ann_infos["image"],
+            points=temp_bboxes,
+            relations=temp_relations,
+            texts=temp_padded_text_inds,
+            labels=temp_labels,
+            tag=tag,
+        )
+
+    def convert_canonical(self, points_x, points_y):
+
+        assert len(points_x) == 4
+        assert len(points_y) == 4
+
+        points = [Point(points_x[i], points_y[i]) for i in range(4)]
+
+        polygon = Polygon([(p.x, p.y) for p in points])
+        min_x, min_y, _, _ = polygon.bounds
+        points_to_lefttop = [
+            LineString([points[i], Point(min_x, min_y)]) for i in range(4)
+        ]
+        distances = np.array([line.length for line in points_to_lefttop])
+        sort_dist_idx = np.argsort(distances)
+        lefttop_idx = sort_dist_idx[0]
+
+        if lefttop_idx == 0:
+            point_orders = [0, 1, 2, 3]
+        elif lefttop_idx == 1:
+            point_orders = [1, 2, 3, 0]
+        elif lefttop_idx == 2:
+            point_orders = [2, 3, 0, 1]
+        else:
+            point_orders = [3, 0, 1, 2]
+
+        sorted_points_x = [points_x[i] for i in point_orders]
+        sorted_points_y = [points_y[j] for j in point_orders]
+
+        return sorted_points_x, sorted_points_y
+
+    def sort_vertex(self, points_x, points_y):
+
+        assert len(points_x) == 4
+        assert len(points_y) == 4
+
+        x = np.array(points_x)
+        y = np.array(points_y)
+        center_x = np.sum(x) * 0.25
+        center_y = np.sum(y) * 0.25
+
+        x_arr = np.array(x - center_x)
+        y_arr = np.array(y - center_y)
+
+        angle = np.arctan2(y_arr, x_arr) * 180.0 / np.pi
+        sort_idx = np.argsort(angle)
+
+        sorted_points_x, sorted_points_y = [], []
+        for i in range(4):
+            sorted_points_x.append(points_x[sort_idx[i]])
+            sorted_points_y.append(points_y[sort_idx[i]])
+
+        return self.convert_canonical(sorted_points_x, sorted_points_y)
+
+    def __call__(self, data):
+        import json
+
+        label = data["label"]
+        annotations = json.loads(label)
+        boxes, texts, text_inds, labels, edges = [], [], [], [], []
+        for ann in annotations:
+            box = ann["points"]
+            x_list = [box[i][0] for i in range(4)]
+            y_list = [box[i][1] for i in range(4)]
+            sorted_x_list, sorted_y_list = self.sort_vertex(x_list, y_list)
+            sorted_box = []
+            for x, y in zip(sorted_x_list, sorted_y_list):
+                sorted_box.append(x)
+                sorted_box.append(y)
+            boxes.append(sorted_box)
+            text = ann["transcription"]
+            texts.append(ann["transcription"])
+            text_ind = [self.dict[c] for c in text if c in self.dict]
+            text_inds.append(text_ind)
+            if "label" in ann.keys():
+                labels.append(ann["label"])
+            elif "key_cls" in ann.keys():
+                labels.append(ann["key_cls"])
+            else:
+                raise ValueError(
+                    "Cannot found 'key_cls' in ann.keys(), please check your training annotation."
+                )
+            edges.append(ann.get("edge", 0))
+        ann_infos = dict(
+            image=data["image"],
+            points=boxes,
+            texts=texts,
+            text_inds=text_inds,
+            edges=edges,
+            labels=labels,
+        )
+
+        return self.list_to_numpy(ann_infos)
+
+
+class AttnLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(AttnLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def add_special_char(self, dict_character):
+        self.beg_str = "sos"
+        self.end_str = "eos"
+        dict_character = [self.beg_str] + dict_character + [self.end_str]
+        return dict_character
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        if text is None:
+            return None
+        if len(text) >= self.max_text_len:
+            return None
+        data["length"] = np.array(len(text))
+        text = (
+            [0]
+            + text
+            + [len(self.character) - 1]
+            + [0] * (self.max_text_len - len(text) - 2)
+        )
+        data["label"] = np.array(text)
+        return data
+
+    def get_ignored_tokens(self):
+        beg_idx = self.get_beg_end_flag_idx("beg")
+        end_idx = self.get_beg_end_flag_idx("end")
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end):
+        if beg_or_end == "beg":
+            idx = np.array(self.dict[self.beg_str])
+        elif beg_or_end == "end":
+            idx = np.array(self.dict[self.end_str])
+        else:
+            assert False, "Unsupport type %s in get_beg_end_flag_idx" % beg_or_end
+        return idx
+
+
+class SEEDLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(SEEDLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def add_special_char(self, dict_character):
+        self.padding = "padding"
+        self.end_str = "eos"
+        self.unknown = "unknown"
+        dict_character = dict_character + [self.end_str, self.padding, self.unknown]
+        return dict_character
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        if text is None:
+            return None
+        if len(text) >= self.max_text_len:
+            return None
+        data["length"] = np.array(len(text)) + 1  # conclude eos
+        text = (
+            text
+            + [len(self.character) - 3]
+            + [len(self.character) - 2] * (self.max_text_len - len(text) - 1)
+        )
+        data["label"] = np.array(text)
+        return data
+
+
+class SRNLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self,
+        max_text_length=25,
+        character_dict_path=None,
+        use_space_char=False,
+        **kwargs
+    ):
+        super(SRNLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def add_special_char(self, dict_character):
+        dict_character = dict_character + [self.beg_str, self.end_str]
+        return dict_character
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        char_num = len(self.character)
+        if text is None:
+            return None
+        if len(text) > self.max_text_len:
+            return None
+        data["length"] = np.array(len(text))
+        text = text + [char_num - 1] * (self.max_text_len - len(text))
+        data["label"] = np.array(text)
+        return data
+
+    def get_ignored_tokens(self):
+        beg_idx = self.get_beg_end_flag_idx("beg")
+        end_idx = self.get_beg_end_flag_idx("end")
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end):
+        if beg_or_end == "beg":
+            idx = np.array(self.dict[self.beg_str])
+        elif beg_or_end == "end":
+            idx = np.array(self.dict[self.end_str])
+        else:
+            assert False, "Unsupport type %s in get_beg_end_flag_idx" % beg_or_end
+        return idx
+
+
+class TableLabelEncode(object):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self,
+        max_text_length,
+        max_elem_length,
+        max_cell_num,
+        character_dict_path,
+        span_weight=1.0,
+        **kwargs
+    ):
+        self.max_text_length = max_text_length
+        self.max_elem_length = max_elem_length
+        self.max_cell_num = max_cell_num
+        list_character, list_elem = self.load_char_elem_dict(character_dict_path)
+        list_character = self.add_special_char(list_character)
+        list_elem = self.add_special_char(list_elem)
+        self.dict_character = {}
+        for i, char in enumerate(list_character):
+            self.dict_character[char] = i
+        self.dict_elem = {}
+        for i, elem in enumerate(list_elem):
+            self.dict_elem[elem] = i
+        self.span_weight = span_weight
+
+    def load_char_elem_dict(self, character_dict_path):
+        list_character = []
+        list_elem = []
+        with open(character_dict_path, "rb") as fin:
+            lines = fin.readlines()
+            substr = lines[0].decode("utf-8").strip("\r\n").split("\t")
+            character_num = int(substr[0])
+            elem_num = int(substr[1])
+            for cno in range(1, 1 + character_num):
+                character = lines[cno].decode("utf-8").strip("\r\n")
+                list_character.append(character)
+            for eno in range(1 + character_num, 1 + character_num + elem_num):
+                elem = lines[eno].decode("utf-8").strip("\r\n")
+                list_elem.append(elem)
+        return list_character, list_elem
+
+    def add_special_char(self, list_character):
+        self.beg_str = "sos"
+        self.end_str = "eos"
+        list_character = [self.beg_str] + list_character + [self.end_str]
+        return list_character
+
+    def get_span_idx_list(self):
+        span_idx_list = []
+        for elem in self.dict_elem:
+            if "span" in elem:
+                span_idx_list.append(self.dict_elem[elem])
+        return span_idx_list
+
+    def __call__(self, data):
+        cells = data["cells"]
+        structure = data["structure"]["tokens"]
+        structure = self.encode(structure, "elem")
+        if structure is None:
+            return None
+        elem_num = len(structure)
+        structure = [0] + structure + [len(self.dict_elem) - 1]
+        structure = structure + [0] * (self.max_elem_length + 2 - len(structure))
+        structure = np.array(structure)
+        data["structure"] = structure
+        elem_char_idx1 = self.dict_elem["<td>"]
+        elem_char_idx2 = self.dict_elem["<td"]
+        span_idx_list = self.get_span_idx_list()
+        td_idx_list = np.logical_or(
+            structure == elem_char_idx1, structure == elem_char_idx2
+        )
+        td_idx_list = np.where(td_idx_list)[0]
+
+        structure_mask = np.ones((self.max_elem_length + 2, 1), dtype=np.float32)
+        bbox_list = np.zeros((self.max_elem_length + 2, 4), dtype=np.float32)
+        bbox_list_mask = np.zeros((self.max_elem_length + 2, 1), dtype=np.float32)
+        img_height, img_width, img_ch = data["image"].shape
+        if len(span_idx_list) > 0:
+            span_weight = len(td_idx_list) * 1.0 / len(span_idx_list)
+            span_weight = min(max(span_weight, 1.0), self.span_weight)
+        for cno in range(len(cells)):
+            if "bbox" in cells[cno]:
+                bbox = cells[cno]["bbox"].copy()
+                bbox[0] = bbox[0] * 1.0 / img_width
+                bbox[1] = bbox[1] * 1.0 / img_height
+                bbox[2] = bbox[2] * 1.0 / img_width
+                bbox[3] = bbox[3] * 1.0 / img_height
+                td_idx = td_idx_list[cno]
+                bbox_list[td_idx] = bbox
+                bbox_list_mask[td_idx] = 1.0
+                cand_span_idx = td_idx + 1
+                if cand_span_idx < (self.max_elem_length + 2):
+                    if structure[cand_span_idx] in span_idx_list:
+                        structure_mask[cand_span_idx] = span_weight
+
+        data["bbox_list"] = bbox_list
+        data["bbox_list_mask"] = bbox_list_mask
+        data["structure_mask"] = structure_mask
+        char_beg_idx = self.get_beg_end_flag_idx("beg", "char")
+        char_end_idx = self.get_beg_end_flag_idx("end", "char")
+        elem_beg_idx = self.get_beg_end_flag_idx("beg", "elem")
+        elem_end_idx = self.get_beg_end_flag_idx("end", "elem")
+        data["sp_tokens"] = np.array(
+            [
+                char_beg_idx,
+                char_end_idx,
+                elem_beg_idx,
+                elem_end_idx,
+                elem_char_idx1,
+                elem_char_idx2,
+                self.max_text_length,
+                self.max_elem_length,
+                self.max_cell_num,
+                elem_num,
+            ]
+        )
+        return data
+
+    def encode(self, text, char_or_elem):
+        """convert text-label into text-index."""
+        if char_or_elem == "char":
+            max_len = self.max_text_length
+            current_dict = self.dict_character
+        else:
+            max_len = self.max_elem_length
+            current_dict = self.dict_elem
+        if len(text) > max_len:
+            return None
+        if len(text) == 0:
+            if char_or_elem == "char":
+                return [self.dict_character["space"]]
+            else:
+                return None
+        text_list = []
+        for char in text:
+            if char not in current_dict:
+                return None
+            text_list.append(current_dict[char])
+        if len(text_list) == 0:
+            if char_or_elem == "char":
+                return [self.dict_character["space"]]
+            else:
+                return None
+        return text_list
+
+    def get_ignored_tokens(self, char_or_elem):
+        beg_idx = self.get_beg_end_flag_idx("beg", char_or_elem)
+        end_idx = self.get_beg_end_flag_idx("end", char_or_elem)
+        return [beg_idx, end_idx]
+
+    def get_beg_end_flag_idx(self, beg_or_end, char_or_elem):
+        if char_or_elem == "char":
+            if beg_or_end == "beg":
+                idx = np.array(self.dict_character[self.beg_str])
+            elif beg_or_end == "end":
+                idx = np.array(self.dict_character[self.end_str])
+            else:
+                assert False, (
+                    "Unsupport type %s in get_beg_end_flag_idx of char" % beg_or_end
+                )
+        elif char_or_elem == "elem":
+            if beg_or_end == "beg":
+                idx = np.array(self.dict_elem[self.beg_str])
+            elif beg_or_end == "end":
+                idx = np.array(self.dict_elem[self.end_str])
+            else:
+                assert False, (
+                    "Unsupport type %s in get_beg_end_flag_idx of elem" % beg_or_end
+                )
+        else:
+            assert False, "Unsupport type %s in char_or_elem" % char_or_elem
+        return idx
+
+
+class SARLabelEncode(BaseRecLabelEncode):
+    """Convert between text-label and text-index"""
+
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(SARLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def add_special_char(self, dict_character):
+        beg_end_str = "<BOS/EOS>"
+        unknown_str = "<UKN>"
+        padding_str = "<PAD>"
+        dict_character = dict_character + [unknown_str]
+        self.unknown_idx = len(dict_character) - 1
+        dict_character = dict_character + [beg_end_str]
+        self.start_idx = len(dict_character) - 1
+        self.end_idx = len(dict_character) - 1
+        dict_character = dict_character + [padding_str]
+        self.padding_idx = len(dict_character) - 1
+
+        return dict_character
+
+    def __call__(self, data):
+        text = data["label"]
+        text = self.encode(text)
+        if text is None:
+            return None
+        if len(text) >= self.max_text_len - 1:
+            return None
+        data["length"] = np.array(len(text))
+        target = [self.start_idx] + text + [self.end_idx]
+        padded_text = [self.padding_idx for _ in range(self.max_text_len)]
+
+        padded_text[: len(target)] = target
+        data["label"] = np.array(padded_text)
+        return data
+
+    def get_ignored_tokens(self):
+        return [self.padding_idx]
+
+
+class PRENLabelEncode(BaseRecLabelEncode):
+    def __init__(
+        self, max_text_length, character_dict_path, use_space_char=False, **kwargs
+    ):
+        super(PRENLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+    def add_special_char(self, dict_character):
+        padding_str = "<PAD>"  # 0
+        end_str = "<EOS>"  # 1
+        unknown_str = "<UNK>"  # 2
+
+        dict_character = [padding_str, end_str, unknown_str] + dict_character
+        self.padding_idx = 0
+        self.end_idx = 1
+        self.unknown_idx = 2
+
+        return dict_character
+
+    def encode(self, text):
+        if len(text) == 0 or len(text) >= self.max_text_len:
+            return None
+        if self.lower:
+            text = text.lower()
+        text_list = []
+        for char in text:
+            if char not in self.dict:
+                text_list.append(self.unknown_idx)
+            else:
+                text_list.append(self.dict[char])
+        text_list.append(self.end_idx)
+        if len(text_list) < self.max_text_len:
+            text_list += [self.padding_idx] * (self.max_text_len - len(text_list))
+        return text_list
+
+    def __call__(self, data):
+        text = data["label"]
+        encoded_text = self.encode(text)
+        if encoded_text is None:
+            return None
+        data["label"] = np.array(encoded_text)
+        return data
+
+
+class VQATokenLabelEncode(object):
+    """
+    Label encode for NLP VQA methods
+    """
+
+    def __init__(
+        self,
+        class_path,
+        contains_re=False,
+        add_special_ids=False,
+        algorithm="LayoutXLM",
+        infer_mode=False,
+        ocr_engine=None,
+        **kwargs
+    ):
+        super(VQATokenLabelEncode, self).__init__()
+        from paddlenlp.transformers import (
+            LayoutLMTokenizer,
+            LayoutLMv2Tokenizer,
+            LayoutXLMTokenizer,
+        )
+
+        from ppocr.utils.utility import load_vqa_bio_label_maps
+
+        tokenizer_dict = {
+            "LayoutXLM": {
+                "class": LayoutXLMTokenizer,
+                "pretrained_model": "layoutxlm-base-uncased",
+            },
+            "LayoutLM": {
+                "class": LayoutLMTokenizer,
+                "pretrained_model": "layoutlm-base-uncased",
+            },
+            "LayoutLMv2": {
+                "class": LayoutLMv2Tokenizer,
+                "pretrained_model": "layoutlmv2-base-uncased",
+            },
+        }
+        self.contains_re = contains_re
+        tokenizer_config = tokenizer_dict[algorithm]
+        self.tokenizer = tokenizer_config["class"].from_pretrained(
+            tokenizer_config["pretrained_model"]
+        )
+        self.label2id_map, id2label_map = load_vqa_bio_label_maps(class_path)
+        self.add_special_ids = add_special_ids
+        self.infer_mode = infer_mode
+        self.ocr_engine = ocr_engine
+
+    def __call__(self, data):
+        # load bbox and label info
+        ocr_info = self._load_ocr_info(data)
+
+        height, width, _ = data["image"].shape
+
+        words_list = []
+        bbox_list = []
+        input_ids_list = []
+        token_type_ids_list = []
+        segment_offset_id = []
+        gt_label_list = []
+
+        entities = []
+
+        # for re
+        train_re = self.contains_re and not self.infer_mode
+        if train_re:
+            relations = []
+            id2label = {}
+            entity_id_to_index_map = {}
+            empty_entity = set()
+
+        data["ocr_info"] = copy.deepcopy(ocr_info)
+
+        for info in ocr_info:
+            if train_re:
+                # for re
+                if len(info["text"]) == 0:
+                    empty_entity.add(info["id"])
+                    continue
+                id2label[info["id"]] = info["label"]
+                relations.extend([tuple(sorted(l)) for l in info["linking"]])
+            # smooth_box
+            bbox = self._smooth_box(info["bbox"], height, width)
+
+            text = info["text"]
+            encode_res = self.tokenizer.encode(
+                text, pad_to_max_seq_len=False, return_attention_mask=True
+            )
+
+            if not self.add_special_ids:
+                # TODO: use tok.all_special_ids to remove
+                encode_res["input_ids"] = encode_res["input_ids"][1:-1]
+                encode_res["token_type_ids"] = encode_res["token_type_ids"][1:-1]
+                encode_res["attention_mask"] = encode_res["attention_mask"][1:-1]
+            # parse label
+            if not self.infer_mode:
+                label = info["label"]
+                gt_label = self._parse_label(label, encode_res)
+
+            # construct entities for re
+            if train_re:
+                if gt_label[0] != self.label2id_map["O"]:
+                    entity_id_to_index_map[info["id"]] = len(entities)
+                    label = label.upper()
+                    entities.append(
+                        {
+                            "start": len(input_ids_list),
+                            "end": len(input_ids_list) + len(encode_res["input_ids"]),
+                            "label": label.upper(),
+                        }
+                    )
+            else:
+                entities.append(
+                    {
+                        "start": len(input_ids_list),
+                        "end": len(input_ids_list) + len(encode_res["input_ids"]),
+                        "label": "O",
+                    }
+                )
+            input_ids_list.extend(encode_res["input_ids"])
+            token_type_ids_list.extend(encode_res["token_type_ids"])
+            bbox_list.extend([bbox] * len(encode_res["input_ids"]))
+            words_list.append(text)
+            segment_offset_id.append(len(input_ids_list))
+            if not self.infer_mode:
+                gt_label_list.extend(gt_label)
+
+        data["input_ids"] = input_ids_list
+        data["token_type_ids"] = token_type_ids_list
+        data["bbox"] = bbox_list
+        data["attention_mask"] = [1] * len(input_ids_list)
+        data["labels"] = gt_label_list
+        data["segment_offset_id"] = segment_offset_id
+        data["tokenizer_params"] = dict(
+            padding_side=self.tokenizer.padding_side,
+            pad_token_type_id=self.tokenizer.pad_token_type_id,
+            pad_token_id=self.tokenizer.pad_token_id,
+        )
+        data["entities"] = entities
+
+        if train_re:
+            data["relations"] = relations
+            data["id2label"] = id2label
+            data["empty_entity"] = empty_entity
+            data["entity_id_to_index_map"] = entity_id_to_index_map
+        return data
+
+    def _load_ocr_info(self, data):
+        def trans_poly_to_bbox(poly):
+            x1 = np.min([p[0] for p in poly])
+            x2 = np.max([p[0] for p in poly])
+            y1 = np.min([p[1] for p in poly])
+            y2 = np.max([p[1] for p in poly])
+            return [x1, y1, x2, y2]
+
+        if self.infer_mode:
+            ocr_result = self.ocr_engine.ocr(data["image"], cls=False)
+            ocr_info = []
+            for res in ocr_result:
+                ocr_info.append(
+                    {
+                        "text": res[1][0],
+                        "bbox": trans_poly_to_bbox(res[0]),
+                        "poly": res[0],
+                    }
+                )
+            return ocr_info
+        else:
+            info = data["label"]
+            # read text info
+            info_dict = json.loads(info)
+            return info_dict["ocr_info"]
+
+    def _smooth_box(self, bbox, height, width):
+        bbox[0] = int(bbox[0] * 1000.0 / width)
+        bbox[2] = int(bbox[2] * 1000.0 / width)
+        bbox[1] = int(bbox[1] * 1000.0 / height)
+        bbox[3] = int(bbox[3] * 1000.0 / height)
+        return bbox
+
+    def _parse_label(self, label, encode_res):
+        gt_label = []
+        if label.lower() == "other":
+            gt_label.extend([0] * len(encode_res["input_ids"]))
+        else:
+            gt_label.append(self.label2id_map[("b-" + label).upper()])
+            gt_label.extend(
+                [self.label2id_map[("i-" + label).upper()]]
+                * (len(encode_res["input_ids"]) - 1)
+            )
+        return gt_label
+
+
+class MultiLabelEncode(BaseRecLabelEncode):
+    def __init__(
+        self, max_text_length, character_dict_path=None, use_space_char=False, **kwargs
+    ):
+        super(MultiLabelEncode, self).__init__(
+            max_text_length, character_dict_path, use_space_char
+        )
+
+        self.ctc_encode = CTCLabelEncode(
+            max_text_length, character_dict_path, use_space_char, **kwargs
+        )
+        self.sar_encode = SARLabelEncode(
+            max_text_length, character_dict_path, use_space_char, **kwargs
+        )
+
+    def __call__(self, data):
+
+        data_ctc = copy.deepcopy(data)
+        data_sar = copy.deepcopy(data)
+        data_out = dict()
+        data_out["img_path"] = data.get("img_path", None)
+        data_out["image"] = data["image"]
+        ctc = self.ctc_encode.__call__(data_ctc)
+        sar = self.sar_encode.__call__(data_sar)
+        if ctc is None or sar is None:
+            return None
+        data_out["label_ctc"] = ctc["label"]
+        data_out["label_sar"] = sar["label"]
+        data_out["length"] = ctc["length"]
+        return data_out

ocr/ppocr/data/imaug/make_border_map.py

@@ -0,0 +1,155 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import cv2
+import numpy as np
+
+np.seterr(divide="ignore", invalid="ignore")
+import warnings
+
+import pyclipper
+from shapely.geometry import Polygon
+
+warnings.simplefilter("ignore")
+
+__all__ = ["MakeBorderMap"]
+
+
+class MakeBorderMap(object):
+    def __init__(self, shrink_ratio=0.4, thresh_min=0.3, thresh_max=0.7, **kwargs):
+        self.shrink_ratio = shrink_ratio
+        self.thresh_min = thresh_min
+        self.thresh_max = thresh_max
+
+    def __call__(self, data):
+
+        img = data["image"]
+        text_polys = data["polys"]
+        ignore_tags = data["ignore_tags"]
+
+        canvas = np.zeros(img.shape[:2], dtype=np.float32)
+        mask = np.zeros(img.shape[:2], dtype=np.float32)
+
+        for i in range(len(text_polys)):
+            if ignore_tags[i]:
+                continue
+            self.draw_border_map(text_polys[i], canvas, mask=mask)
+        canvas = canvas * (self.thresh_max - self.thresh_min) + self.thresh_min
+
+        data["threshold_map"] = canvas
+        data["threshold_mask"] = mask
+        return data
+
+    def draw_border_map(self, polygon, canvas, mask):
+        polygon = np.array(polygon)
+        assert polygon.ndim == 2
+        assert polygon.shape[1] == 2
+
+        polygon_shape = Polygon(polygon)
+        if polygon_shape.area <= 0:
+            return
+        distance = (
+            polygon_shape.area
+            * (1 - np.power(self.shrink_ratio, 2))
+            / polygon_shape.length
+        )
+        subject = [tuple(l) for l in polygon]
+        padding = pyclipper.PyclipperOffset()
+        padding.AddPath(subject, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
+
+        padded_polygon = np.array(padding.Execute(distance)[0])
+        cv2.fillPoly(mask, [padded_polygon.astype(np.int32)], 1.0)
+
+        xmin = padded_polygon[:, 0].min()
+        xmax = padded_polygon[:, 0].max()
+        ymin = padded_polygon[:, 1].min()
+        ymax = padded_polygon[:, 1].max()
+        width = xmax - xmin + 1
+        height = ymax - ymin + 1
+
+        polygon[:, 0] = polygon[:, 0] - xmin
+        polygon[:, 1] = polygon[:, 1] - ymin
+
+        xs = np.broadcast_to(
+            np.linspace(0, width - 1, num=width).reshape(1, width), (height, width)
+        )
+        ys = np.broadcast_to(
+            np.linspace(0, height - 1, num=height).reshape(height, 1), (height, width)
+        )
+
+        distance_map = np.zeros((polygon.shape[0], height, width), dtype=np.float32)
+        for i in range(polygon.shape[0]):
+            j = (i + 1) % polygon.shape[0]
+            absolute_distance = self._distance(xs, ys, polygon[i], polygon[j])
+            distance_map[i] = np.clip(absolute_distance / distance, 0, 1)
+        distance_map = distance_map.min(axis=0)
+
+        xmin_valid = min(max(0, xmin), canvas.shape[1] - 1)
+        xmax_valid = min(max(0, xmax), canvas.shape[1] - 1)
+        ymin_valid = min(max(0, ymin), canvas.shape[0] - 1)
+        ymax_valid = min(max(0, ymax), canvas.shape[0] - 1)
+        canvas[ymin_valid : ymax_valid + 1, xmin_valid : xmax_valid + 1] = np.fmax(
+            1
+            - distance_map[
+                ymin_valid - ymin : ymax_valid - ymax + height,
+                xmin_valid - xmin : xmax_valid - xmax + width,
+            ],
+            canvas[ymin_valid : ymax_valid + 1, xmin_valid : xmax_valid + 1],
+        )
+
+    def _distance(self, xs, ys, point_1, point_2):
+        """
+        compute the distance from point to a line
+        ys: coordinates in the first axis
+        xs: coordinates in the second axis
+        point_1, point_2: (x, y), the end of the line
+        """
+        height, width = xs.shape[:2]
+        square_distance_1 = np.square(xs - point_1[0]) + np.square(ys - point_1[1])
+        square_distance_2 = np.square(xs - point_2[0]) + np.square(ys - point_2[1])
+        square_distance = np.square(point_1[0] - point_2[0]) + np.square(
+            point_1[1] - point_2[1]
+        )
+
+        cosin = (square_distance - square_distance_1 - square_distance_2) / (
+            2 * np.sqrt(square_distance_1 * square_distance_2)
+        )
+        square_sin = 1 - np.square(cosin)
+        square_sin = np.nan_to_num(square_sin)
+        result = np.sqrt(
+            square_distance_1 * square_distance_2 * square_sin / square_distance
+        )
+
+        result[cosin < 0] = np.sqrt(np.fmin(square_distance_1, square_distance_2))[
+            cosin < 0
+        ]
+        # self.extend_line(point_1, point_2, result)
+        return result
+
+    def extend_line(self, point_1, point_2, result, shrink_ratio):
+        ex_point_1 = (
+            int(round(point_1[0] + (point_1[0] - point_2[0]) * (1 + shrink_ratio))),
+            int(round(point_1[1] + (point_1[1] - point_2[1]) * (1 + shrink_ratio))),
+        )
+        cv2.line(
+            result,
+            tuple(ex_point_1),
+            tuple(point_1),
+            4096.0,
+            1,
+            lineType=cv2.LINE_AA,
+            shift=0,
+        )
+        ex_point_2 = (
+            int(round(point_2[0] + (point_2[0] - point_1[0]) * (1 + shrink_ratio))),
+            int(round(point_2[1] + (point_2[1] - point_1[1]) * (1 + shrink_ratio))),
+        )
+        cv2.line(
+            result,
+            tuple(ex_point_2),
+            tuple(point_2),
+            4096.0,
+            1,
+            lineType=cv2.LINE_AA,
+            shift=0,
+        )
+        return ex_point_1, ex_point_2

ocr/ppocr/data/imaug/make_pse_gt.py

@@ -0,0 +1,88 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import cv2
+import numpy as np
+import pyclipper
+from shapely.geometry import Polygon
+
+__all__ = ["MakePseGt"]
+
+
+class MakePseGt(object):
+    def __init__(self, kernel_num=7, size=640, min_shrink_ratio=0.4, **kwargs):
+        self.kernel_num = kernel_num
+        self.min_shrink_ratio = min_shrink_ratio
+        self.size = size
+
+    def __call__(self, data):
+
+        image = data["image"]
+        text_polys = data["polys"]
+        ignore_tags = data["ignore_tags"]
+
+        h, w, _ = image.shape
+        short_edge = min(h, w)
+        if short_edge < self.size:
+            # keep short_size >= self.size
+            scale = self.size / short_edge
+            image = cv2.resize(image, dsize=None, fx=scale, fy=scale)
+            text_polys *= scale
+
+        gt_kernels = []
+        for i in range(1, self.kernel_num + 1):
+            # s1->sn, from big to small
+            rate = 1.0 - (1.0 - self.min_shrink_ratio) / (self.kernel_num - 1) * i
+            text_kernel, ignore_tags = self.generate_kernel(
+                image.shape[0:2], rate, text_polys, ignore_tags
+            )
+            gt_kernels.append(text_kernel)
+
+        training_mask = np.ones(image.shape[0:2], dtype="uint8")
+        for i in range(text_polys.shape[0]):
+            if ignore_tags[i]:
+                cv2.fillPoly(
+                    training_mask, text_polys[i].astype(np.int32)[np.newaxis, :, :], 0
+                )
+
+        gt_kernels = np.array(gt_kernels)
+        gt_kernels[gt_kernels > 0] = 1
+
+        data["image"] = image
+        data["polys"] = text_polys
+        data["gt_kernels"] = gt_kernels[0:]
+        data["gt_text"] = gt_kernels[0]
+        data["mask"] = training_mask.astype("float32")
+        return data
+
+    def generate_kernel(self, img_size, shrink_ratio, text_polys, ignore_tags=None):
+        """
+        Refer to part of the code:
+        https://github.com/open-mmlab/mmocr/blob/main/mmocr/datasets/pipelines/textdet_targets/base_textdet_targets.py
+        """
+
+        h, w = img_size
+        text_kernel = np.zeros((h, w), dtype=np.float32)
+        for i, poly in enumerate(text_polys):
+            polygon = Polygon(poly)
+            distance = (
+                polygon.area
+                * (1 - shrink_ratio * shrink_ratio)
+                / (polygon.length + 1e-6)
+            )
+            subject = [tuple(l) for l in poly]
+            pco = pyclipper.PyclipperOffset()
+            pco.AddPath(subject, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
+            shrinked = np.array(pco.Execute(-distance))
+
+            if len(shrinked) == 0 or shrinked.size == 0:
+                if ignore_tags is not None:
+                    ignore_tags[i] = True
+                continue
+            try:
+                shrinked = np.array(shrinked[0]).reshape(-1, 2)
+            except:
+                if ignore_tags is not None:
+                    ignore_tags[i] = True
+                continue
+            cv2.fillPoly(text_kernel, [shrinked.astype(np.int32)], i + 1)
+        return text_kernel, ignore_tags

ocr/ppocr/data/imaug/make_shrink_map.py

@@ -0,0 +1,100 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import cv2
+import numpy as np
+import pyclipper
+from shapely.geometry import Polygon
+
+__all__ = ["MakeShrinkMap"]
+
+
+class MakeShrinkMap(object):
+    r"""
+    Making binary mask from detection data with ICDAR format.
+    Typically following the process of class `MakeICDARData`.
+    """
+
+    def __init__(self, min_text_size=8, shrink_ratio=0.4, **kwargs):
+        self.min_text_size = min_text_size
+        self.shrink_ratio = shrink_ratio
+
+    def __call__(self, data):
+        image = data["image"]
+        text_polys = data["polys"]
+        ignore_tags = data["ignore_tags"]
+
+        h, w = image.shape[:2]
+        text_polys, ignore_tags = self.validate_polygons(text_polys, ignore_tags, h, w)
+        gt = np.zeros((h, w), dtype=np.float32)
+        mask = np.ones((h, w), dtype=np.float32)
+        for i in range(len(text_polys)):
+            polygon = text_polys[i]
+            height = max(polygon[:, 1]) - min(polygon[:, 1])
+            width = max(polygon[:, 0]) - min(polygon[:, 0])
+            if ignore_tags[i] or min(height, width) < self.min_text_size:
+                cv2.fillPoly(mask, polygon.astype(np.int32)[np.newaxis, :, :], 0)
+                ignore_tags[i] = True
+            else:
+                polygon_shape = Polygon(polygon)
+                subject = [tuple(l) for l in polygon]
+                padding = pyclipper.PyclipperOffset()
+                padding.AddPath(subject, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
+                shrinked = []
+
+                # Increase the shrink ratio every time we get multiple polygon returned back
+                possible_ratios = np.arange(self.shrink_ratio, 1, self.shrink_ratio)
+                np.append(possible_ratios, 1)
+                # print(possible_ratios)
+                for ratio in possible_ratios:
+                    # print(f"Change shrink ratio to {ratio}")
+                    distance = (
+                        polygon_shape.area
+                        * (1 - np.power(ratio, 2))
+                        / polygon_shape.length
+                    )
+                    shrinked = padding.Execute(-distance)
+                    if len(shrinked) == 1:
+                        break
+
+                if shrinked == []:
+                    cv2.fillPoly(mask, polygon.astype(np.int32)[np.newaxis, :, :], 0)
+                    ignore_tags[i] = True
+                    continue
+
+                for each_shirnk in shrinked:
+                    shirnk = np.array(each_shirnk).reshape(-1, 2)
+                    cv2.fillPoly(gt, [shirnk.astype(np.int32)], 1)
+
+        data["shrink_map"] = gt
+        data["shrink_mask"] = mask
+        return data
+
+    def validate_polygons(self, polygons, ignore_tags, h, w):
+        """
+        polygons (numpy.array, required): of shape (num_instances, num_points, 2)
+        """
+        if len(polygons) == 0:
+            return polygons, ignore_tags
+        assert len(polygons) == len(ignore_tags)
+        for polygon in polygons:
+            polygon[:, 0] = np.clip(polygon[:, 0], 0, w - 1)
+            polygon[:, 1] = np.clip(polygon[:, 1], 0, h - 1)
+
+        for i in range(len(polygons)):
+            area = self.polygon_area(polygons[i])
+            if abs(area) < 1:
+                ignore_tags[i] = True
+            if area > 0:
+                polygons[i] = polygons[i][::-1, :]
+        return polygons, ignore_tags
+
+    def polygon_area(self, polygon):
+        """
+        compute polygon area
+        """
+        area = 0
+        q = polygon[-1]
+        for p in polygon:
+            area += p[0] * q[1] - p[1] * q[0]
+            q = p
+        return area / 2.0

ocr/ppocr/data/imaug/operators.py

@@ -0,0 +1,458 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import math
+import sys
+
+import cv2
+import numpy as np
+import six
+
+
+class DecodeImage(object):
+    """decode image"""
+
+    def __init__(
+        self, img_mode="RGB", channel_first=False, ignore_orientation=False, **kwargs
+    ):
+        self.img_mode = img_mode
+        self.channel_first = channel_first
+        self.ignore_orientation = ignore_orientation
+
+    def __call__(self, data):
+        img = data["image"]
+        if six.PY2:
+            assert (
+                type(img) is str and len(img) > 0
+            ), "invalid input 'img' in DecodeImage"
+        else:
+            assert (
+                type(img) is bytes and len(img) > 0
+            ), "invalid input 'img' in DecodeImage"
+        img = np.frombuffer(img, dtype="uint8")
+        if self.ignore_orientation:
+            img = cv2.imdecode(img, cv2.IMREAD_IGNORE_ORIENTATION | cv2.IMREAD_COLOR)
+        else:
+            img = cv2.imdecode(img, 1)
+        if img is None:
+            return None
+        if self.img_mode == "GRAY":
+            img = cv2.cvtColor(img, cv2.COLOR_GRAY2BGR)
+        elif self.img_mode == "RGB":
+            assert img.shape[2] == 3, "invalid shape of image[%s]" % (img.shape)
+            img = img[:, :, ::-1]
+
+        if self.channel_first:
+            img = img.transpose((2, 0, 1))
+
+        data["image"] = img
+        return data
+
+
+class NRTRDecodeImage(object):
+    """decode image"""
+
+    def __init__(self, img_mode="RGB", channel_first=False, **kwargs):
+        self.img_mode = img_mode
+        self.channel_first = channel_first
+
+    def __call__(self, data):
+        img = data["image"]
+        if six.PY2:
+            assert (
+                type(img) is str and len(img) > 0
+            ), "invalid input 'img' in DecodeImage"
+        else:
+            assert (
+                type(img) is bytes and len(img) > 0
+            ), "invalid input 'img' in DecodeImage"
+        img = np.frombuffer(img, dtype="uint8")
+
+        img = cv2.imdecode(img, 1)
+
+        if img is None:
+            return None
+        if self.img_mode == "GRAY":
+            img = cv2.cvtColor(img, cv2.COLOR_GRAY2BGR)
+        elif self.img_mode == "RGB":
+            assert img.shape[2] == 3, "invalid shape of image[%s]" % (img.shape)
+            img = img[:, :, ::-1]
+        img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+        if self.channel_first:
+            img = img.transpose((2, 0, 1))
+        data["image"] = img
+        return data
+
+
+class NormalizeImage(object):
+    """normalize image such as substract mean, divide std"""
+
+    def __init__(self, scale=None, mean=None, std=None, order="chw", **kwargs):
+        if isinstance(scale, str):
+            scale = eval(scale)
+        self.scale = np.float32(scale if scale is not None else 1.0 / 255.0)
+        mean = mean if mean is not None else [0.485, 0.456, 0.406]
+        std = std if std is not None else [0.229, 0.224, 0.225]
+
+        shape = (3, 1, 1) if order == "chw" else (1, 1, 3)
+        self.mean = np.array(mean).reshape(shape).astype("float32")
+        self.std = np.array(std).reshape(shape).astype("float32")
+
+    def __call__(self, data):
+        img = data["image"]
+        from PIL import Image
+
+        if isinstance(img, Image.Image):
+            img = np.array(img)
+        assert isinstance(img, np.ndarray), "invalid input 'img' in NormalizeImage"
+        data["image"] = (img.astype("float32") * self.scale - self.mean) / self.std
+        return data
+
+
+class ToCHWImage(object):
+    """convert hwc image to chw image"""
+
+    def __init__(self, **kwargs):
+        pass
+
+    def __call__(self, data):
+        img = data["image"]
+        from PIL import Image
+
+        if isinstance(img, Image.Image):
+            img = np.array(img)
+        data["image"] = img.transpose((2, 0, 1))
+        return data
+
+
+class Fasttext(object):
+    def __init__(self, path="None", **kwargs):
+        import fasttext
+
+        self.fast_model = fasttext.load_model(path)
+
+    def __call__(self, data):
+        label = data["label"]
+        fast_label = self.fast_model[label]
+        data["fast_label"] = fast_label
+        return data
+
+
+class KeepKeys(object):
+    def __init__(self, keep_keys, **kwargs):
+        self.keep_keys = keep_keys
+
+    def __call__(self, data):
+        data_list = []
+        for key in self.keep_keys:
+            data_list.append(data[key])
+        return data_list
+
+
+class Pad(object):
+    def __init__(self, size=None, size_div=32, **kwargs):
+        if size is not None and not isinstance(size, (int, list, tuple)):
+            raise TypeError(
+                "Type of target_size is invalid. Now is {}".format(type(size))
+            )
+        if isinstance(size, int):
+            size = [size, size]
+        self.size = size
+        self.size_div = size_div
+
+    def __call__(self, data):
+
+        img = data["image"]
+        img_h, img_w = img.shape[0], img.shape[1]
+        if self.size:
+            resize_h2, resize_w2 = self.size
+            assert (
+                img_h < resize_h2 and img_w < resize_w2
+            ), "(h, w) of target size should be greater than (img_h, img_w)"
+        else:
+            resize_h2 = max(
+                int(math.ceil(img.shape[0] / self.size_div) * self.size_div),
+                self.size_div,
+            )
+            resize_w2 = max(
+                int(math.ceil(img.shape[1] / self.size_div) * self.size_div),
+                self.size_div,
+            )
+        img = cv2.copyMakeBorder(
+            img,
+            0,
+            resize_h2 - img_h,
+            0,
+            resize_w2 - img_w,
+            cv2.BORDER_CONSTANT,
+            value=0,
+        )
+        data["image"] = img
+        return data
+
+
+class Resize(object):
+    def __init__(self, size=(640, 640), **kwargs):
+        self.size = size
+
+    def resize_image(self, img):
+        resize_h, resize_w = self.size
+        ori_h, ori_w = img.shape[:2]  # (h, w, c)
+        ratio_h = float(resize_h) / ori_h
+        ratio_w = float(resize_w) / ori_w
+        img = cv2.resize(img, (int(resize_w), int(resize_h)))
+        return img, [ratio_h, ratio_w]
+
+    def __call__(self, data):
+        img = data["image"]
+        if "polys" in data:
+            text_polys = data["polys"]
+
+        img_resize, [ratio_h, ratio_w] = self.resize_image(img)
+        if "polys" in data:
+            new_boxes = []
+            for box in text_polys:
+                new_box = []
+                for cord in box:
+                    new_box.append([cord[0] * ratio_w, cord[1] * ratio_h])
+                new_boxes.append(new_box)
+            data["polys"] = np.array(new_boxes, dtype=np.float32)
+        data["image"] = img_resize
+        return data
+
+
+class DetResizeForTest(object):
+    def __init__(self, **kwargs):
+        super(DetResizeForTest, self).__init__()
+        self.resize_type = 0
+        if "image_shape" in kwargs:
+            self.image_shape = kwargs["image_shape"]
+            self.resize_type = 1
+        elif "limit_side_len" in kwargs:
+            self.limit_side_len = kwargs["limit_side_len"]
+            self.limit_type = kwargs.get("limit_type", "min")
+        elif "resize_long" in kwargs:
+            self.resize_type = 2
+            self.resize_long = kwargs.get("resize_long", 960)
+        else:
+            self.limit_side_len = 736
+            self.limit_type = "min"
+
+    def __call__(self, data):
+        img = data["image"]
+        src_h, src_w, _ = img.shape
+
+        if self.resize_type == 0:
+            # img, shape = self.resize_image_type0(img)
+            img, [ratio_h, ratio_w] = self.resize_image_type0(img)
+        elif self.resize_type == 2:
+            img, [ratio_h, ratio_w] = self.resize_image_type2(img)
+        else:
+            # img, shape = self.resize_image_type1(img)
+            img, [ratio_h, ratio_w] = self.resize_image_type1(img)
+        data["image"] = img
+        data["shape"] = np.array([src_h, src_w, ratio_h, ratio_w])
+        return data
+
+    def resize_image_type1(self, img):
+        resize_h, resize_w = self.image_shape
+        ori_h, ori_w = img.shape[:2]  # (h, w, c)
+        ratio_h = float(resize_h) / ori_h
+        ratio_w = float(resize_w) / ori_w
+        img = cv2.resize(img, (int(resize_w), int(resize_h)))
+        # return img, np.array([ori_h, ori_w])
+        return img, [ratio_h, ratio_w]
+
+    def resize_image_type0(self, img):
+        """
+        resize image to a size multiple of 32 which is required by the network
+        args:
+            img(array): array with shape [h, w, c]
+        return(tuple):
+            img, (ratio_h, ratio_w)
+        """
+        limit_side_len = self.limit_side_len
+        h, w, c = img.shape
+
+        # limit the max side
+        if self.limit_type == "max":
+            if max(h, w) > limit_side_len:
+                if h > w:
+                    ratio = float(limit_side_len) / h
+                else:
+                    ratio = float(limit_side_len) / w
+            else:
+                ratio = 1.0
+        elif self.limit_type == "min":
+            if min(h, w) < limit_side_len:
+                if h < w:
+                    ratio = float(limit_side_len) / h
+                else:
+                    ratio = float(limit_side_len) / w
+            else:
+                ratio = 1.0
+        elif self.limit_type == "resize_long":
+            ratio = float(limit_side_len) / max(h, w)
+        else:
+            raise Exception("not support limit type, image ")
+        resize_h = int(h * ratio)
+        resize_w = int(w * ratio)
+
+        resize_h = max(int(round(resize_h / 32) * 32), 32)
+        resize_w = max(int(round(resize_w / 32) * 32), 32)
+
+        try:
+            if int(resize_w) <= 0 or int(resize_h) <= 0:
+                return None, (None, None)
+            img = cv2.resize(img, (int(resize_w), int(resize_h)))
+        except:
+            print(img.shape, resize_w, resize_h)
+            sys.exit(0)
+        ratio_h = resize_h / float(h)
+        ratio_w = resize_w / float(w)
+        return img, [ratio_h, ratio_w]
+
+    def resize_image_type2(self, img):
+        h, w, _ = img.shape
+
+        resize_w = w
+        resize_h = h
+
+        if resize_h > resize_w:
+            ratio = float(self.resize_long) / resize_h
+        else:
+            ratio = float(self.resize_long) / resize_w
+
+        resize_h = int(resize_h * ratio)
+        resize_w = int(resize_w * ratio)
+
+        max_stride = 128
+        resize_h = (resize_h + max_stride - 1) // max_stride * max_stride
+        resize_w = (resize_w + max_stride - 1) // max_stride * max_stride
+        img = cv2.resize(img, (int(resize_w), int(resize_h)))
+        ratio_h = resize_h / float(h)
+        ratio_w = resize_w / float(w)
+
+        return img, [ratio_h, ratio_w]
+
+
+class E2EResizeForTest(object):
+    def __init__(self, **kwargs):
+        super(E2EResizeForTest, self).__init__()
+        self.max_side_len = kwargs["max_side_len"]
+        self.valid_set = kwargs["valid_set"]
+
+    def __call__(self, data):
+        img = data["image"]
+        src_h, src_w, _ = img.shape
+        if self.valid_set == "totaltext":
+            im_resized, [ratio_h, ratio_w] = self.resize_image_for_totaltext(
+                img, max_side_len=self.max_side_len
+            )
+        else:
+            im_resized, (ratio_h, ratio_w) = self.resize_image(
+                img, max_side_len=self.max_side_len
+            )
+        data["image"] = im_resized
+        data["shape"] = np.array([src_h, src_w, ratio_h, ratio_w])
+        return data
+
+    def resize_image_for_totaltext(self, im, max_side_len=512):
+
+        h, w, _ = im.shape
+        resize_w = w
+        resize_h = h
+        ratio = 1.25
+        if h * ratio > max_side_len:
+            ratio = float(max_side_len) / resize_h
+        resize_h = int(resize_h * ratio)
+        resize_w = int(resize_w * ratio)
+
+        max_stride = 128
+        resize_h = (resize_h + max_stride - 1) // max_stride * max_stride
+        resize_w = (resize_w + max_stride - 1) // max_stride * max_stride
+        im = cv2.resize(im, (int(resize_w), int(resize_h)))
+        ratio_h = resize_h / float(h)
+        ratio_w = resize_w / float(w)
+        return im, (ratio_h, ratio_w)
+
+    def resize_image(self, im, max_side_len=512):
+        """
+        resize image to a size multiple of max_stride which is required by the network
+        :param im: the resized image
+        :param max_side_len: limit of max image size to avoid out of memory in gpu
+        :return: the resized image and the resize ratio
+        """
+        h, w, _ = im.shape
+
+        resize_w = w
+        resize_h = h
+
+        # Fix the longer side
+        if resize_h > resize_w:
+            ratio = float(max_side_len) / resize_h
+        else:
+            ratio = float(max_side_len) / resize_w
+
+        resize_h = int(resize_h * ratio)
+        resize_w = int(resize_w * ratio)
+
+        max_stride = 128
+        resize_h = (resize_h + max_stride - 1) // max_stride * max_stride
+        resize_w = (resize_w + max_stride - 1) // max_stride * max_stride
+        im = cv2.resize(im, (int(resize_w), int(resize_h)))
+        ratio_h = resize_h / float(h)
+        ratio_w = resize_w / float(w)
+
+        return im, (ratio_h, ratio_w)
+
+
+class KieResize(object):
+    def __init__(self, **kwargs):
+        super(KieResize, self).__init__()
+        self.max_side, self.min_side = kwargs["img_scale"][0], kwargs["img_scale"][1]
+
+    def __call__(self, data):
+        img = data["image"]
+        points = data["points"]
+        src_h, src_w, _ = img.shape
+        (
+            im_resized,
+            scale_factor,
+            [ratio_h, ratio_w],
+            [new_h, new_w],
+        ) = self.resize_image(img)
+        resize_points = self.resize_boxes(img, points, scale_factor)
+        data["ori_image"] = img
+        data["ori_boxes"] = points
+        data["points"] = resize_points
+        data["image"] = im_resized
+        data["shape"] = np.array([new_h, new_w])
+        return data
+
+    def resize_image(self, img):
+        norm_img = np.zeros([1024, 1024, 3], dtype="float32")
+        scale = [512, 1024]
+        h, w = img.shape[:2]
+        max_long_edge = max(scale)
+        max_short_edge = min(scale)
+        scale_factor = min(max_long_edge / max(h, w), max_short_edge / min(h, w))
+        resize_w, resize_h = int(w * float(scale_factor) + 0.5), int(
+            h * float(scale_factor) + 0.5
+        )
+        max_stride = 32
+        resize_h = (resize_h + max_stride - 1) // max_stride * max_stride
+        resize_w = (resize_w + max_stride - 1) // max_stride * max_stride
+        im = cv2.resize(img, (resize_w, resize_h))
+        new_h, new_w = im.shape[:2]
+        w_scale = new_w / w
+        h_scale = new_h / h
+        scale_factor = np.array([w_scale, h_scale, w_scale, h_scale], dtype=np.float32)
+        norm_img[:new_h, :new_w, :] = im
+        return norm_img, scale_factor, [h_scale, w_scale], [new_h, new_w]
+
+    def resize_boxes(self, im, points, scale_factor):
+        points = points * scale_factor
+        img_shape = im.shape[:2]
+        points[:, 0::2] = np.clip(points[:, 0::2], 0, img_shape[1])
+        points[:, 1::2] = np.clip(points[:, 1::2], 0, img_shape[0])
+        return points

ocr/ppocr/data/imaug/pg_process.py

@@ -0,0 +1,961 @@
+import math
+
+import cv2
+import numpy as np
+
+__all__ = ["PGProcessTrain"]
+
+
+class PGProcessTrain(object):
+    def __init__(
+        self,
+        character_dict_path,
+        max_text_length,
+        max_text_nums,
+        tcl_len,
+        batch_size=14,
+        min_crop_size=24,
+        min_text_size=4,
+        max_text_size=512,
+        **kwargs
+    ):
+        self.tcl_len = tcl_len
+        self.max_text_length = max_text_length
+        self.max_text_nums = max_text_nums
+        self.batch_size = batch_size
+        self.min_crop_size = min_crop_size
+        self.min_text_size = min_text_size
+        self.max_text_size = max_text_size
+        self.Lexicon_Table = self.get_dict(character_dict_path)
+        self.pad_num = len(self.Lexicon_Table)
+        self.img_id = 0
+
+    def get_dict(self, character_dict_path):
+        character_str = ""
+        with open(character_dict_path, "rb") as fin:
+            lines = fin.readlines()
+            for line in lines:
+                line = line.decode("utf-8").strip("\n").strip("\r\n")
+                character_str += line
+            dict_character = list(character_str)
+        return dict_character
+
+    def quad_area(self, poly):
+        """
+        compute area of a polygon
+        :param poly:
+        :return:
+        """
+        edge = [
+            (poly[1][0] - poly[0][0]) * (poly[1][1] + poly[0][1]),
+            (poly[2][0] - poly[1][0]) * (poly[2][1] + poly[1][1]),
+            (poly[3][0] - poly[2][0]) * (poly[3][1] + poly[2][1]),
+            (poly[0][0] - poly[3][0]) * (poly[0][1] + poly[3][1]),
+        ]
+        return np.sum(edge) / 2.0
+
+    def gen_quad_from_poly(self, poly):
+        """
+        Generate min area quad from poly.
+        """
+        point_num = poly.shape[0]
+        min_area_quad = np.zeros((4, 2), dtype=np.float32)
+        rect = cv2.minAreaRect(
+            poly.astype(np.int32)
+        )  # (center (x,y), (width, height), angle of rotation)
+        box = np.array(cv2.boxPoints(rect))
+
+        first_point_idx = 0
+        min_dist = 1e4
+        for i in range(4):
+            dist = (
+                np.linalg.norm(box[(i + 0) % 4] - poly[0])
+                + np.linalg.norm(box[(i + 1) % 4] - poly[point_num // 2 - 1])
+                + np.linalg.norm(box[(i + 2) % 4] - poly[point_num // 2])
+                + np.linalg.norm(box[(i + 3) % 4] - poly[-1])
+            )
+            if dist < min_dist:
+                min_dist = dist
+                first_point_idx = i
+        for i in range(4):
+            min_area_quad[i] = box[(first_point_idx + i) % 4]
+
+        return min_area_quad
+
+    def check_and_validate_polys(self, polys, tags, im_size):
+        """
+        check so that the text poly is in the same direction,
+        and also filter some invalid polygons
+        :param polys:
+        :param tags:
+        :return:
+        """
+        (h, w) = im_size
+        if polys.shape[0] == 0:
+            return polys, np.array([]), np.array([])
+        polys[:, :, 0] = np.clip(polys[:, :, 0], 0, w - 1)
+        polys[:, :, 1] = np.clip(polys[:, :, 1], 0, h - 1)
+
+        validated_polys = []
+        validated_tags = []
+        hv_tags = []
+        for poly, tag in zip(polys, tags):
+            quad = self.gen_quad_from_poly(poly)
+            p_area = self.quad_area(quad)
+            if abs(p_area) < 1:
+                print("invalid poly")
+                continue
+            if p_area > 0:
+                if tag == False:
+                    print("poly in wrong direction")
+                    tag = True  # reversed cases should be ignore
+                poly = poly[(0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1), :]
+                quad = quad[(0, 3, 2, 1), :]
+
+            len_w = np.linalg.norm(quad[0] - quad[1]) + np.linalg.norm(
+                quad[3] - quad[2]
+            )
+            len_h = np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(
+                quad[1] - quad[2]
+            )
+            hv_tag = 1
+
+            if len_w * 2.0 < len_h:
+                hv_tag = 0
+
+            validated_polys.append(poly)
+            validated_tags.append(tag)
+            hv_tags.append(hv_tag)
+        return np.array(validated_polys), np.array(validated_tags), np.array(hv_tags)
+
+    def crop_area(
+        self, im, polys, tags, hv_tags, txts, crop_background=False, max_tries=25
+    ):
+        """
+        make random crop from the input image
+        :param im:
+        :param polys:  [b,4,2]
+        :param tags:
+        :param crop_background:
+        :param max_tries: 50 -> 25
+        :return:
+        """
+        h, w, _ = im.shape
+        pad_h = h // 10
+        pad_w = w // 10
+        h_array = np.zeros((h + pad_h * 2), dtype=np.int32)
+        w_array = np.zeros((w + pad_w * 2), dtype=np.int32)
+        for poly in polys:
+            poly = np.round(poly, decimals=0).astype(np.int32)
+            minx = np.min(poly[:, 0])
+            maxx = np.max(poly[:, 0])
+            w_array[minx + pad_w : maxx + pad_w] = 1
+            miny = np.min(poly[:, 1])
+            maxy = np.max(poly[:, 1])
+            h_array[miny + pad_h : maxy + pad_h] = 1
+        # ensure the cropped area not across a text
+        h_axis = np.where(h_array == 0)[0]
+        w_axis = np.where(w_array == 0)[0]
+        if len(h_axis) == 0 or len(w_axis) == 0:
+            return im, polys, tags, hv_tags, txts
+        for i in range(max_tries):
+            xx = np.random.choice(w_axis, size=2)
+            xmin = np.min(xx) - pad_w
+            xmax = np.max(xx) - pad_w
+            xmin = np.clip(xmin, 0, w - 1)
+            xmax = np.clip(xmax, 0, w - 1)
+            yy = np.random.choice(h_axis, size=2)
+            ymin = np.min(yy) - pad_h
+            ymax = np.max(yy) - pad_h
+            ymin = np.clip(ymin, 0, h - 1)
+            ymax = np.clip(ymax, 0, h - 1)
+            if xmax - xmin < self.min_crop_size or ymax - ymin < self.min_crop_size:
+                continue
+            if polys.shape[0] != 0:
+                poly_axis_in_area = (
+                    (polys[:, :, 0] >= xmin)
+                    & (polys[:, :, 0] <= xmax)
+                    & (polys[:, :, 1] >= ymin)
+                    & (polys[:, :, 1] <= ymax)
+                )
+                selected_polys = np.where(np.sum(poly_axis_in_area, axis=1) == 4)[0]
+            else:
+                selected_polys = []
+            if len(selected_polys) == 0:
+                # no text in this area
+                if crop_background:
+                    txts_tmp = []
+                    for selected_poly in selected_polys:
+                        txts_tmp.append(txts[selected_poly])
+                    txts = txts_tmp
+                    return (
+                        im[ymin : ymax + 1, xmin : xmax + 1, :],
+                        polys[selected_polys],
+                        tags[selected_polys],
+                        hv_tags[selected_polys],
+                        txts,
+                    )
+                else:
+                    continue
+            im = im[ymin : ymax + 1, xmin : xmax + 1, :]
+            polys = polys[selected_polys]
+            tags = tags[selected_polys]
+            hv_tags = hv_tags[selected_polys]
+            txts_tmp = []
+            for selected_poly in selected_polys:
+                txts_tmp.append(txts[selected_poly])
+            txts = txts_tmp
+            polys[:, :, 0] -= xmin
+            polys[:, :, 1] -= ymin
+            return im, polys, tags, hv_tags, txts
+
+        return im, polys, tags, hv_tags, txts
+
+    def fit_and_gather_tcl_points_v2(
+        self,
+        min_area_quad,
+        poly,
+        max_h,
+        max_w,
+        fixed_point_num=64,
+        img_id=0,
+        reference_height=3,
+    ):
+        """
+        Find the center point of poly as key_points, then fit and gather.
+        """
+        key_point_xys = []
+        point_num = poly.shape[0]
+        for idx in range(point_num // 2):
+            center_point = (poly[idx] + poly[point_num - 1 - idx]) / 2.0
+            key_point_xys.append(center_point)
+
+        tmp_image = np.zeros(
+            shape=(
+                max_h,
+                max_w,
+            ),
+            dtype="float32",
+        )
+        cv2.polylines(tmp_image, [np.array(key_point_xys).astype("int32")], False, 1.0)
+        ys, xs = np.where(tmp_image > 0)
+        xy_text = np.array(list(zip(xs, ys)), dtype="float32")
+
+        left_center_pt = ((min_area_quad[0] - min_area_quad[1]) / 2.0).reshape(1, 2)
+        right_center_pt = ((min_area_quad[1] - min_area_quad[2]) / 2.0).reshape(1, 2)
+        proj_unit_vec = (right_center_pt - left_center_pt) / (
+            np.linalg.norm(right_center_pt - left_center_pt) + 1e-6
+        )
+        proj_unit_vec_tile = np.tile(proj_unit_vec, (xy_text.shape[0], 1))  # (n, 2)
+        left_center_pt_tile = np.tile(left_center_pt, (xy_text.shape[0], 1))  # (n, 2)
+        xy_text_to_left_center = xy_text - left_center_pt_tile
+        proj_value = np.sum(xy_text_to_left_center * proj_unit_vec_tile, axis=1)
+        xy_text = xy_text[np.argsort(proj_value)]
+
+        # convert to np and keep the num of point not greater then fixed_point_num
+        pos_info = np.array(xy_text).reshape(-1, 2)[:, ::-1]  # xy-> yx
+        point_num = len(pos_info)
+        if point_num > fixed_point_num:
+            keep_ids = [
+                int((point_num * 1.0 / fixed_point_num) * x)
+                for x in range(fixed_point_num)
+            ]
+            pos_info = pos_info[keep_ids, :]
+
+        keep = int(min(len(pos_info), fixed_point_num))
+        if np.random.rand() < 0.2 and reference_height >= 3:
+            dl = (np.random.rand(keep) - 0.5) * reference_height * 0.3
+            random_float = np.array([1, 0]).reshape([1, 2]) * dl.reshape([keep, 1])
+            pos_info += random_float
+            pos_info[:, 0] = np.clip(pos_info[:, 0], 0, max_h - 1)
+            pos_info[:, 1] = np.clip(pos_info[:, 1], 0, max_w - 1)
+
+        # padding to fixed length
+        pos_l = np.zeros((self.tcl_len, 3), dtype=np.int32)
+        pos_l[:, 0] = np.ones((self.tcl_len,)) * img_id
+        pos_m = np.zeros((self.tcl_len, 1), dtype=np.float32)
+        pos_l[:keep, 1:] = np.round(pos_info).astype(np.int32)
+        pos_m[:keep] = 1.0
+        return pos_l, pos_m
+
+    def generate_direction_map(self, poly_quads, n_char, direction_map):
+        """ """
+        width_list = []
+        height_list = []
+        for quad in poly_quads:
+            quad_w = (
+                np.linalg.norm(quad[0] - quad[1]) + np.linalg.norm(quad[2] - quad[3])
+            ) / 2.0
+            quad_h = (
+                np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(quad[2] - quad[1])
+            ) / 2.0
+            width_list.append(quad_w)
+            height_list.append(quad_h)
+        norm_width = max(sum(width_list) / n_char, 1.0)
+        average_height = max(sum(height_list) / len(height_list), 1.0)
+        k = 1
+        for quad in poly_quads:
+            direct_vector_full = ((quad[1] + quad[2]) - (quad[0] + quad[3])) / 2.0
+            direct_vector = (
+                direct_vector_full
+                / (np.linalg.norm(direct_vector_full) + 1e-6)
+                * norm_width
+            )
+            direction_label = tuple(
+                map(float, [direct_vector[0], direct_vector[1], 1.0 / average_height])
+            )
+            cv2.fillPoly(
+                direction_map,
+                quad.round().astype(np.int32)[np.newaxis, :, :],
+                direction_label,
+            )
+            k += 1
+        return direction_map
+
+    def calculate_average_height(self, poly_quads):
+        """ """
+        height_list = []
+        for quad in poly_quads:
+            quad_h = (
+                np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(quad[2] - quad[1])
+            ) / 2.0
+            height_list.append(quad_h)
+        average_height = max(sum(height_list) / len(height_list), 1.0)
+        return average_height
+
+    def generate_tcl_ctc_label(
+        self,
+        h,
+        w,
+        polys,
+        tags,
+        text_strs,
+        ds_ratio,
+        tcl_ratio=0.3,
+        shrink_ratio_of_width=0.15,
+    ):
+        """
+        Generate polygon.
+        """
+        score_map_big = np.zeros(
+            (
+                h,
+                w,
+            ),
+            dtype=np.float32,
+        )
+        h, w = int(h * ds_ratio), int(w * ds_ratio)
+        polys = polys * ds_ratio
+
+        score_map = np.zeros(
+            (
+                h,
+                w,
+            ),
+            dtype=np.float32,
+        )
+        score_label_map = np.zeros(
+            (
+                h,
+                w,
+            ),
+            dtype=np.float32,
+        )
+        tbo_map = np.zeros((h, w, 5), dtype=np.float32)
+        training_mask = np.ones(
+            (
+                h,
+                w,
+            ),
+            dtype=np.float32,
+        )
+        direction_map = np.ones((h, w, 3)) * np.array([0, 0, 1]).reshape(
+            [1, 1, 3]
+        ).astype(np.float32)
+
+        label_idx = 0
+        score_label_map_text_label_list = []
+        pos_list, pos_mask, label_list = [], [], []
+        for poly_idx, poly_tag in enumerate(zip(polys, tags)):
+            poly = poly_tag[0]
+            tag = poly_tag[1]
+
+            # generate min_area_quad
+            min_area_quad, center_point = self.gen_min_area_quad_from_poly(poly)
+            min_area_quad_h = 0.5 * (
+                np.linalg.norm(min_area_quad[0] - min_area_quad[3])
+                + np.linalg.norm(min_area_quad[1] - min_area_quad[2])
+            )
+            min_area_quad_w = 0.5 * (
+                np.linalg.norm(min_area_quad[0] - min_area_quad[1])
+                + np.linalg.norm(min_area_quad[2] - min_area_quad[3])
+            )
+
+            if (
+                min(min_area_quad_h, min_area_quad_w) < self.min_text_size * ds_ratio
+                or min(min_area_quad_h, min_area_quad_w) > self.max_text_size * ds_ratio
+            ):
+                continue
+
+            if tag:
+                cv2.fillPoly(
+                    training_mask, poly.astype(np.int32)[np.newaxis, :, :], 0.15
+                )
+            else:
+                text_label = text_strs[poly_idx]
+                text_label = self.prepare_text_label(text_label, self.Lexicon_Table)
+
+                text_label_index_list = [
+                    [self.Lexicon_Table.index(c_)]
+                    for c_ in text_label
+                    if c_ in self.Lexicon_Table
+                ]
+                if len(text_label_index_list) < 1:
+                    continue
+
+                tcl_poly = self.poly2tcl(poly, tcl_ratio)
+                tcl_quads = self.poly2quads(tcl_poly)
+                poly_quads = self.poly2quads(poly)
+
+                stcl_quads, quad_index = self.shrink_poly_along_width(
+                    tcl_quads,
+                    shrink_ratio_of_width=shrink_ratio_of_width,
+                    expand_height_ratio=1.0 / tcl_ratio,
+                )
+
+                cv2.fillPoly(score_map, np.round(stcl_quads).astype(np.int32), 1.0)
+                cv2.fillPoly(
+                    score_map_big, np.round(stcl_quads / ds_ratio).astype(np.int32), 1.0
+                )
+
+                for idx, quad in enumerate(stcl_quads):
+                    quad_mask = np.zeros((h, w), dtype=np.float32)
+                    quad_mask = cv2.fillPoly(
+                        quad_mask,
+                        np.round(quad[np.newaxis, :, :]).astype(np.int32),
+                        1.0,
+                    )
+                    tbo_map = self.gen_quad_tbo(
+                        poly_quads[quad_index[idx]], quad_mask, tbo_map
+                    )
+
+                # score label map and score_label_map_text_label_list for refine
+                if label_idx == 0:
+                    text_pos_list_ = [
+                        [len(self.Lexicon_Table)],
+                    ]
+                    score_label_map_text_label_list.append(text_pos_list_)
+
+                label_idx += 1
+                cv2.fillPoly(
+                    score_label_map, np.round(poly_quads).astype(np.int32), label_idx
+                )
+                score_label_map_text_label_list.append(text_label_index_list)
+
+                # direction info, fix-me
+                n_char = len(text_label_index_list)
+                direction_map = self.generate_direction_map(
+                    poly_quads, n_char, direction_map
+                )
+
+                # pos info
+                average_shrink_height = self.calculate_average_height(stcl_quads)
+                pos_l, pos_m = self.fit_and_gather_tcl_points_v2(
+                    min_area_quad,
+                    poly,
+                    max_h=h,
+                    max_w=w,
+                    fixed_point_num=64,
+                    img_id=self.img_id,
+                    reference_height=average_shrink_height,
+                )
+
+                label_l = text_label_index_list
+                if len(text_label_index_list) < 2:
+                    continue
+
+                pos_list.append(pos_l)
+                pos_mask.append(pos_m)
+                label_list.append(label_l)
+
+        # use big score_map for smooth tcl lines
+        score_map_big_resized = cv2.resize(
+            score_map_big, dsize=None, fx=ds_ratio, fy=ds_ratio
+        )
+        score_map = np.array(score_map_big_resized > 1e-3, dtype="float32")
+
+        return (
+            score_map,
+            score_label_map,
+            tbo_map,
+            direction_map,
+            training_mask,
+            pos_list,
+            pos_mask,
+            label_list,
+            score_label_map_text_label_list,
+        )
+
+    def adjust_point(self, poly):
+        """
+        adjust point order.
+        """
+        point_num = poly.shape[0]
+        if point_num == 4:
+            len_1 = np.linalg.norm(poly[0] - poly[1])
+            len_2 = np.linalg.norm(poly[1] - poly[2])
+            len_3 = np.linalg.norm(poly[2] - poly[3])
+            len_4 = np.linalg.norm(poly[3] - poly[0])
+
+            if (len_1 + len_3) * 1.5 < (len_2 + len_4):
+                poly = poly[[1, 2, 3, 0], :]
+
+        elif point_num > 4:
+            vector_1 = poly[0] - poly[1]
+            vector_2 = poly[1] - poly[2]
+            cos_theta = np.dot(vector_1, vector_2) / (
+                np.linalg.norm(vector_1) * np.linalg.norm(vector_2) + 1e-6
+            )
+            theta = np.arccos(np.round(cos_theta, decimals=4))
+
+            if abs(theta) > (70 / 180 * math.pi):
+                index = list(range(1, point_num)) + [0]
+                poly = poly[np.array(index), :]
+        return poly
+
+    def gen_min_area_quad_from_poly(self, poly):
+        """
+        Generate min area quad from poly.
+        """
+        point_num = poly.shape[0]
+        min_area_quad = np.zeros((4, 2), dtype=np.float32)
+        if point_num == 4:
+            min_area_quad = poly
+            center_point = np.sum(poly, axis=0) / 4
+        else:
+            rect = cv2.minAreaRect(
+                poly.astype(np.int32)
+            )  # (center (x,y), (width, height), angle of rotation)
+            center_point = rect[0]
+            box = np.array(cv2.boxPoints(rect))
+
+            first_point_idx = 0
+            min_dist = 1e4
+            for i in range(4):
+                dist = (
+                    np.linalg.norm(box[(i + 0) % 4] - poly[0])
+                    + np.linalg.norm(box[(i + 1) % 4] - poly[point_num // 2 - 1])
+                    + np.linalg.norm(box[(i + 2) % 4] - poly[point_num // 2])
+                    + np.linalg.norm(box[(i + 3) % 4] - poly[-1])
+                )
+                if dist < min_dist:
+                    min_dist = dist
+                    first_point_idx = i
+
+            for i in range(4):
+                min_area_quad[i] = box[(first_point_idx + i) % 4]
+
+        return min_area_quad, center_point
+
+    def shrink_quad_along_width(self, quad, begin_width_ratio=0.0, end_width_ratio=1.0):
+        """
+        Generate shrink_quad_along_width.
+        """
+        ratio_pair = np.array(
+            [[begin_width_ratio], [end_width_ratio]], dtype=np.float32
+        )
+        p0_1 = quad[0] + (quad[1] - quad[0]) * ratio_pair
+        p3_2 = quad[3] + (quad[2] - quad[3]) * ratio_pair
+        return np.array([p0_1[0], p0_1[1], p3_2[1], p3_2[0]])
+
+    def shrink_poly_along_width(
+        self, quads, shrink_ratio_of_width, expand_height_ratio=1.0
+    ):
+        """
+        shrink poly with given length.
+        """
+        upper_edge_list = []
+
+        def get_cut_info(edge_len_list, cut_len):
+            for idx, edge_len in enumerate(edge_len_list):
+                cut_len -= edge_len
+                if cut_len <= 0.000001:
+                    ratio = (cut_len + edge_len_list[idx]) / edge_len_list[idx]
+                    return idx, ratio
+
+        for quad in quads:
+            upper_edge_len = np.linalg.norm(quad[0] - quad[1])
+            upper_edge_list.append(upper_edge_len)
+
+        # length of left edge and right edge.
+        left_length = np.linalg.norm(quads[0][0] - quads[0][3]) * expand_height_ratio
+        right_length = np.linalg.norm(quads[-1][1] - quads[-1][2]) * expand_height_ratio
+
+        shrink_length = (
+            min(left_length, right_length, sum(upper_edge_list)) * shrink_ratio_of_width
+        )
+        # shrinking length
+        upper_len_left = shrink_length
+        upper_len_right = sum(upper_edge_list) - shrink_length
+
+        left_idx, left_ratio = get_cut_info(upper_edge_list, upper_len_left)
+        left_quad = self.shrink_quad_along_width(
+            quads[left_idx], begin_width_ratio=left_ratio, end_width_ratio=1
+        )
+        right_idx, right_ratio = get_cut_info(upper_edge_list, upper_len_right)
+        right_quad = self.shrink_quad_along_width(
+            quads[right_idx], begin_width_ratio=0, end_width_ratio=right_ratio
+        )
+
+        out_quad_list = []
+        if left_idx == right_idx:
+            out_quad_list.append(
+                [left_quad[0], right_quad[1], right_quad[2], left_quad[3]]
+            )
+        else:
+            out_quad_list.append(left_quad)
+            for idx in range(left_idx + 1, right_idx):
+                out_quad_list.append(quads[idx])
+            out_quad_list.append(right_quad)
+
+        return np.array(out_quad_list), list(range(left_idx, right_idx + 1))
+
+    def prepare_text_label(self, label_str, Lexicon_Table):
+        """
+        Prepare text lablel by given Lexicon_Table.
+        """
+        if len(Lexicon_Table) == 36:
+            return label_str.lower()
+        else:
+            return label_str
+
+    def vector_angle(self, A, B):
+        """
+        Calculate the angle between vector AB and x-axis positive direction.
+        """
+        AB = np.array([B[1] - A[1], B[0] - A[0]])
+        return np.arctan2(*AB)
+
+    def theta_line_cross_point(self, theta, point):
+        """
+        Calculate the line through given point and angle in ax + by + c =0 form.
+        """
+        x, y = point
+        cos = np.cos(theta)
+        sin = np.sin(theta)
+        return [sin, -cos, cos * y - sin * x]
+
+    def line_cross_two_point(self, A, B):
+        """
+        Calculate the line through given point A and B in ax + by + c =0 form.
+        """
+        angle = self.vector_angle(A, B)
+        return self.theta_line_cross_point(angle, A)
+
+    def average_angle(self, poly):
+        """
+        Calculate the average angle between left and right edge in given poly.
+        """
+        p0, p1, p2, p3 = poly
+        angle30 = self.vector_angle(p3, p0)
+        angle21 = self.vector_angle(p2, p1)
+        return (angle30 + angle21) / 2
+
+    def line_cross_point(self, line1, line2):
+        """
+        line1 and line2 in  0=ax+by+c form, compute the cross point of line1 and line2
+        """
+        a1, b1, c1 = line1
+        a2, b2, c2 = line2
+        d = a1 * b2 - a2 * b1
+
+        if d == 0:
+            print("Cross point does not exist")
+            return np.array([0, 0], dtype=np.float32)
+        else:
+            x = (b1 * c2 - b2 * c1) / d
+            y = (a2 * c1 - a1 * c2) / d
+
+        return np.array([x, y], dtype=np.float32)
+
+    def quad2tcl(self, poly, ratio):
+        """
+        Generate center line by poly clock-wise point. (4, 2)
+        """
+        ratio_pair = np.array([[0.5 - ratio / 2], [0.5 + ratio / 2]], dtype=np.float32)
+        p0_3 = poly[0] + (poly[3] - poly[0]) * ratio_pair
+        p1_2 = poly[1] + (poly[2] - poly[1]) * ratio_pair
+        return np.array([p0_3[0], p1_2[0], p1_2[1], p0_3[1]])
+
+    def poly2tcl(self, poly, ratio):
+        """
+        Generate center line by poly clock-wise point.
+        """
+        ratio_pair = np.array([[0.5 - ratio / 2], [0.5 + ratio / 2]], dtype=np.float32)
+        tcl_poly = np.zeros_like(poly)
+        point_num = poly.shape[0]
+
+        for idx in range(point_num // 2):
+            point_pair = (
+                poly[idx] + (poly[point_num - 1 - idx] - poly[idx]) * ratio_pair
+            )
+            tcl_poly[idx] = point_pair[0]
+            tcl_poly[point_num - 1 - idx] = point_pair[1]
+        return tcl_poly
+
+    def gen_quad_tbo(self, quad, tcl_mask, tbo_map):
+        """
+        Generate tbo_map for give quad.
+        """
+        # upper and lower line function: ax + by + c = 0;
+        up_line = self.line_cross_two_point(quad[0], quad[1])
+        lower_line = self.line_cross_two_point(quad[3], quad[2])
+
+        quad_h = 0.5 * (
+            np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(quad[1] - quad[2])
+        )
+        quad_w = 0.5 * (
+            np.linalg.norm(quad[0] - quad[1]) + np.linalg.norm(quad[2] - quad[3])
+        )
+
+        # average angle of left and right line.
+        angle = self.average_angle(quad)
+
+        xy_in_poly = np.argwhere(tcl_mask == 1)
+        for y, x in xy_in_poly:
+            point = (x, y)
+            line = self.theta_line_cross_point(angle, point)
+            cross_point_upper = self.line_cross_point(up_line, line)
+            cross_point_lower = self.line_cross_point(lower_line, line)
+            ##FIX, offset reverse
+            upper_offset_x, upper_offset_y = cross_point_upper - point
+            lower_offset_x, lower_offset_y = cross_point_lower - point
+            tbo_map[y, x, 0] = upper_offset_y
+            tbo_map[y, x, 1] = upper_offset_x
+            tbo_map[y, x, 2] = lower_offset_y
+            tbo_map[y, x, 3] = lower_offset_x
+            tbo_map[y, x, 4] = 1.0 / max(min(quad_h, quad_w), 1.0) * 2
+        return tbo_map
+
+    def poly2quads(self, poly):
+        """
+        Split poly into quads.
+        """
+        quad_list = []
+        point_num = poly.shape[0]
+
+        # point pair
+        point_pair_list = []
+        for idx in range(point_num // 2):
+            point_pair = [poly[idx], poly[point_num - 1 - idx]]
+            point_pair_list.append(point_pair)
+
+        quad_num = point_num // 2 - 1
+        for idx in range(quad_num):
+            # reshape and adjust to clock-wise
+            quad_list.append(
+                (np.array(point_pair_list)[[idx, idx + 1]]).reshape(4, 2)[[0, 2, 3, 1]]
+            )
+
+        return np.array(quad_list)
+
+    def rotate_im_poly(self, im, text_polys):
+        """
+        rotate image with 90 / 180 / 270 degre
+        """
+        im_w, im_h = im.shape[1], im.shape[0]
+        dst_im = im.copy()
+        dst_polys = []
+        rand_degree_ratio = np.random.rand()
+        rand_degree_cnt = 1
+        if rand_degree_ratio > 0.5:
+            rand_degree_cnt = 3
+        for i in range(rand_degree_cnt):
+            dst_im = np.rot90(dst_im)
+        rot_degree = -90 * rand_degree_cnt
+        rot_angle = rot_degree * math.pi / 180.0
+        n_poly = text_polys.shape[0]
+        cx, cy = 0.5 * im_w, 0.5 * im_h
+        ncx, ncy = 0.5 * dst_im.shape[1], 0.5 * dst_im.shape[0]
+        for i in range(n_poly):
+            wordBB = text_polys[i]
+            poly = []
+            for j in range(4):  # 16->4
+                sx, sy = wordBB[j][0], wordBB[j][1]
+                dx = (
+                    math.cos(rot_angle) * (sx - cx)
+                    - math.sin(rot_angle) * (sy - cy)
+                    + ncx
+                )
+                dy = (
+                    math.sin(rot_angle) * (sx - cx)
+                    + math.cos(rot_angle) * (sy - cy)
+                    + ncy
+                )
+                poly.append([dx, dy])
+            dst_polys.append(poly)
+        return dst_im, np.array(dst_polys, dtype=np.float32)
+
+    def __call__(self, data):
+        input_size = 512
+        im = data["image"]
+        text_polys = data["polys"]
+        text_tags = data["ignore_tags"]
+        text_strs = data["texts"]
+        h, w, _ = im.shape
+        text_polys, text_tags, hv_tags = self.check_and_validate_polys(
+            text_polys, text_tags, (h, w)
+        )
+        if text_polys.shape[0] <= 0:
+            return None
+        # set aspect ratio and keep area fix
+        asp_scales = np.arange(1.0, 1.55, 0.1)
+        asp_scale = np.random.choice(asp_scales)
+        if np.random.rand() < 0.5:
+            asp_scale = 1.0 / asp_scale
+        asp_scale = math.sqrt(asp_scale)
+
+        asp_wx = asp_scale
+        asp_hy = 1.0 / asp_scale
+        im = cv2.resize(im, dsize=None, fx=asp_wx, fy=asp_hy)
+        text_polys[:, :, 0] *= asp_wx
+        text_polys[:, :, 1] *= asp_hy
+
+        h, w, _ = im.shape
+        if max(h, w) > 2048:
+            rd_scale = 2048.0 / max(h, w)
+            im = cv2.resize(im, dsize=None, fx=rd_scale, fy=rd_scale)
+            text_polys *= rd_scale
+        h, w, _ = im.shape
+        if min(h, w) < 16:
+            return None
+
+        # no background
+        im, text_polys, text_tags, hv_tags, text_strs = self.crop_area(
+            im, text_polys, text_tags, hv_tags, text_strs, crop_background=False
+        )
+
+        if text_polys.shape[0] == 0:
+            return None
+        # # continue for all ignore case
+        if np.sum((text_tags * 1.0)) >= text_tags.size:
+            return None
+        new_h, new_w, _ = im.shape
+        if (new_h is None) or (new_w is None):
+            return None
+        # resize image
+        std_ratio = float(input_size) / max(new_w, new_h)
+        rand_scales = np.array(
+            [0.25, 0.375, 0.5, 0.625, 0.75, 0.875, 1.0, 1.0, 1.0, 1.0, 1.0]
+        )
+        rz_scale = std_ratio * np.random.choice(rand_scales)
+        im = cv2.resize(im, dsize=None, fx=rz_scale, fy=rz_scale)
+        text_polys[:, :, 0] *= rz_scale
+        text_polys[:, :, 1] *= rz_scale
+
+        # add gaussian blur
+        if np.random.rand() < 0.1 * 0.5:
+            ks = np.random.permutation(5)[0] + 1
+            ks = int(ks / 2) * 2 + 1
+            im = cv2.GaussianBlur(im, ksize=(ks, ks), sigmaX=0, sigmaY=0)
+        # add brighter
+        if np.random.rand() < 0.1 * 0.5:
+            im = im * (1.0 + np.random.rand() * 0.5)
+            im = np.clip(im, 0.0, 255.0)
+        # add darker
+        if np.random.rand() < 0.1 * 0.5:
+            im = im * (1.0 - np.random.rand() * 0.5)
+            im = np.clip(im, 0.0, 255.0)
+
+        # Padding the im to [input_size, input_size]
+        new_h, new_w, _ = im.shape
+        if min(new_w, new_h) < input_size * 0.5:
+            return None
+        im_padded = np.ones((input_size, input_size, 3), dtype=np.float32)
+        im_padded[:, :, 2] = 0.485 * 255
+        im_padded[:, :, 1] = 0.456 * 255
+        im_padded[:, :, 0] = 0.406 * 255
+
+        # Random the start position
+        del_h = input_size - new_h
+        del_w = input_size - new_w
+        sh, sw = 0, 0
+        if del_h > 1:
+            sh = int(np.random.rand() * del_h)
+        if del_w > 1:
+            sw = int(np.random.rand() * del_w)
+
+        # Padding
+        im_padded[sh : sh + new_h, sw : sw + new_w, :] = im.copy()
+        text_polys[:, :, 0] += sw
+        text_polys[:, :, 1] += sh
+
+        (
+            score_map,
+            score_label_map,
+            border_map,
+            direction_map,
+            training_mask,
+            pos_list,
+            pos_mask,
+            label_list,
+            score_label_map_text_label,
+        ) = self.generate_tcl_ctc_label(
+            input_size, input_size, text_polys, text_tags, text_strs, 0.25
+        )
+        if len(label_list) <= 0:  # eliminate negative samples
+            return None
+        pos_list_temp = np.zeros([64, 3])
+        pos_mask_temp = np.zeros([64, 1])
+        label_list_temp = np.zeros([self.max_text_length, 1]) + self.pad_num
+
+        for i, label in enumerate(label_list):
+            n = len(label)
+            if n > self.max_text_length:
+                label_list[i] = label[: self.max_text_length]
+                continue
+            while n < self.max_text_length:
+                label.append([self.pad_num])
+                n += 1
+
+        for i in range(len(label_list)):
+            label_list[i] = np.array(label_list[i])
+
+        if len(pos_list) <= 0 or len(pos_list) > self.max_text_nums:
+            return None
+        for __ in range(self.max_text_nums - len(pos_list), 0, -1):
+            pos_list.append(pos_list_temp)
+            pos_mask.append(pos_mask_temp)
+            label_list.append(label_list_temp)
+
+        if self.img_id == self.batch_size - 1:
+            self.img_id = 0
+        else:
+            self.img_id += 1
+
+        im_padded[:, :, 2] -= 0.485 * 255
+        im_padded[:, :, 1] -= 0.456 * 255
+        im_padded[:, :, 0] -= 0.406 * 255
+        im_padded[:, :, 2] /= 255.0 * 0.229
+        im_padded[:, :, 1] /= 255.0 * 0.224
+        im_padded[:, :, 0] /= 255.0 * 0.225
+        im_padded = im_padded.transpose((2, 0, 1))
+        images = im_padded[::-1, :, :]
+        tcl_maps = score_map[np.newaxis, :, :]
+        tcl_label_maps = score_label_map[np.newaxis, :, :]
+        border_maps = border_map.transpose((2, 0, 1))
+        direction_maps = direction_map.transpose((2, 0, 1))
+        training_masks = training_mask[np.newaxis, :, :]
+        pos_list = np.array(pos_list)
+        pos_mask = np.array(pos_mask)
+        label_list = np.array(label_list)
+        data["images"] = images
+        data["tcl_maps"] = tcl_maps
+        data["tcl_label_maps"] = tcl_label_maps
+        data["border_maps"] = border_maps
+        data["direction_maps"] = direction_maps
+        data["training_masks"] = training_masks
+        data["label_list"] = label_list
+        data["pos_list"] = pos_list
+        data["pos_mask"] = pos_mask
+        return data