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| # -*- coding: utf-8 -*- | |
| # Copyright (c) Facebook, Inc. and its affiliates. | |
| import numpy as np | |
| import os | |
| import xml.etree.ElementTree as ET | |
| from typing import List, Tuple, Union | |
| from detectron2.data import DatasetCatalog, MetadataCatalog | |
| from detectron2.structures import BoxMode | |
| from detectron2.utils.file_io import PathManager | |
| __all__ = ["load_voc_instances", "register_pascal_voc"] | |
| # fmt: off | |
| CLASS_NAMES = ( | |
| "aeroplane", "bicycle", "bird", "boat", "bottle", "bus", "car", "cat", | |
| "chair", "cow", "diningtable", "dog", "horse", "motorbike", "person", | |
| "pottedplant", "sheep", "sofa", "train", "tvmonitor" | |
| ) | |
| # fmt: on | |
| def load_voc_instances(dirname: str, split: str, class_names: Union[List[str], Tuple[str, ...]]): | |
| """ | |
| Load Pascal VOC detection annotations to Detectron2 format. | |
| Args: | |
| dirname: Contain "Annotations", "ImageSets", "JPEGImages" | |
| split (str): one of "train", "test", "val", "trainval" | |
| class_names: list or tuple of class names | |
| """ | |
| with PathManager.open(os.path.join(dirname, "ImageSets", "Main", split + ".txt")) as f: | |
| fileids = np.loadtxt(f, dtype=np.str) | |
| # Needs to read many small annotation files. Makes sense at local | |
| annotation_dirname = PathManager.get_local_path(os.path.join(dirname, "Annotations/")) | |
| dicts = [] | |
| for fileid in fileids: | |
| anno_file = os.path.join(annotation_dirname, fileid + ".xml") | |
| jpeg_file = os.path.join(dirname, "JPEGImages", fileid + ".jpg") | |
| with PathManager.open(anno_file) as f: | |
| tree = ET.parse(f) | |
| r = { | |
| "file_name": jpeg_file, | |
| "image_id": fileid, | |
| "height": int(tree.findall("./size/height")[0].text), | |
| "width": int(tree.findall("./size/width")[0].text), | |
| } | |
| instances = [] | |
| for obj in tree.findall("object"): | |
| cls = obj.find("name").text | |
| # We include "difficult" samples in training. | |
| # Based on limited experiments, they don't hurt accuracy. | |
| # difficult = int(obj.find("difficult").text) | |
| # if difficult == 1: | |
| # continue | |
| bbox = obj.find("bndbox") | |
| bbox = [float(bbox.find(x).text) for x in ["xmin", "ymin", "xmax", "ymax"]] | |
| # Original annotations are integers in the range [1, W or H] | |
| # Assuming they mean 1-based pixel indices (inclusive), | |
| # a box with annotation (xmin=1, xmax=W) covers the whole image. | |
| # In coordinate space this is represented by (xmin=0, xmax=W) | |
| bbox[0] -= 1.0 | |
| bbox[1] -= 1.0 | |
| instances.append( | |
| {"category_id": class_names.index(cls), "bbox": bbox, "bbox_mode": BoxMode.XYXY_ABS} | |
| ) | |
| r["annotations"] = instances | |
| dicts.append(r) | |
| return dicts | |
| def register_pascal_voc(name, dirname, split, year, class_names=CLASS_NAMES): | |
| DatasetCatalog.register(name, lambda: load_voc_instances(dirname, split, class_names)) | |
| MetadataCatalog.get(name).set( | |
| thing_classes=list(class_names), dirname=dirname, year=year, split=split | |
| ) | |