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from flask import Flask, render_template, request, jsonify
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import os
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import cv2
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import numpy as np
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import tensorflow as tf
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from object_detection.utils import label_map_util
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from object_detection.utils import visualization_utils as viz_utils
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from object_detection.builders import model_builder
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from object_detection.utils import config_util
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app = Flask(__name__)
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CUSTOM_MODEL_NAME = 'my_ssd_mobnet'
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paths = {
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'CHECKPOINT_PATH': os.path.join('Tensorflow', 'workspace', 'models', CUSTOM_MODEL_NAME),
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'LABELMAP': os.path.join('Tensorflow', 'workspace', 'annotations', 'label_map.pbtxt')
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}
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configs = config_util.get_configs_from_pipeline_file(os.path.join(paths['CHECKPOINT_PATH'], 'pipeline.config'))
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detection_model = model_builder.build(model_config=configs['model'], is_training=False)
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ckpt = tf.compat.v2.train.Checkpoint(model=detection_model)
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ckpt.restore(os.path.join(paths['CHECKPOINT_PATH'], 'ckpt-8')).expect_partial()
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category_index = label_map_util.create_category_index_from_labelmap(paths['LABELMAP'])
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@tf.function
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def detect_fn(image):
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image, shapes = detection_model.preprocess(image)
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prediction_dict = detection_model.predict(image, shapes)
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detections = detection_model.postprocess(prediction_dict, shapes)
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return detections
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@app.route('/detect', methods=['POST'])
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def detect():
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file = request.files['image']
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img = cv2.imdecode(np.frombuffer(file.read(), np.uint8), cv2.IMREAD_COLOR)
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image_np = np.array(img)
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input_tensor = tf.convert_to_tensor(np.expand_dims(image_np, 0), dtype=tf.float32)
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detections = detect_fn(input_tensor)
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num_detections = int(detections.pop('num_detections'))
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detections = {key: value[0, :num_detections].numpy() for key, value in detections.items()}
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detections['num_detections'] = num_detections
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detections['detection_classes'] = detections['detection_classes'].astype(np.int64)
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label_id_offset = 1
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image_np_with_detections = image_np.copy()
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viz_utils.visualize_boxes_and_labels_on_image_array(
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image_np_with_detections,
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detections['detection_boxes'],
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detections['detection_classes'] + label_id_offset,
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detections['detection_scores'],
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category_index,
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use_normalized_coordinates=True,
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max_boxes_to_draw=10,
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min_score_thresh=.4,
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agnostic_mode=False
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)
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ret, buffer = cv2.imencode('.jpg', image_np_with_detections)
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img_str = buffer.tobytes()
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return img_str
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@app.route('/', methods=['GET'])
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def index():
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return render_template('index.html')
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if __name__ == "__main__":
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app.run(debug=True)
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