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| import glob | |
| import json | |
| import os | |
| import cv2 | |
| import numpy as np | |
| def get_mask_from_json(json_path, img): | |
| try: | |
| with open(json_path, "r") as r: | |
| anno = json.loads(r.read()) | |
| except: | |
| with open(json_path, "r", encoding="cp1252") as r: | |
| anno = json.loads(r.read()) | |
| inform = anno["shapes"] | |
| comments = anno["text"] | |
| is_sentence = anno["is_sentence"] | |
| height, width = img.shape[:2] | |
| ### sort polies by area | |
| area_list = [] | |
| valid_poly_list = [] | |
| for i in inform: | |
| label_id = i["label"] | |
| points = i["points"] | |
| if "flag" == label_id.lower(): ## meaningless deprecated annotations | |
| continue | |
| tmp_mask = np.zeros((height, width), dtype=np.uint8) | |
| cv2.polylines(tmp_mask, np.array([points], dtype=np.int32), True, 1, 1) | |
| cv2.fillPoly(tmp_mask, np.array([points], dtype=np.int32), 1) | |
| tmp_area = tmp_mask.sum() | |
| area_list.append(tmp_area) | |
| valid_poly_list.append(i) | |
| ### ground-truth mask | |
| sort_index = np.argsort(area_list)[::-1].astype(np.int32) | |
| sort_index = list(sort_index) | |
| sort_inform = [] | |
| for s_idx in sort_index: | |
| sort_inform.append(valid_poly_list[s_idx]) | |
| mask = np.zeros((height, width), dtype=np.uint8) | |
| for i in sort_inform: | |
| label_id = i["label"] | |
| points = i["points"] | |
| if "ignore" in label_id.lower(): | |
| label_value = 255 # ignored during evaluation | |
| else: | |
| label_value = 1 # target | |
| cv2.polylines(mask, np.array([points], dtype=np.int32), True, label_value, 1) | |
| cv2.fillPoly(mask, np.array([points], dtype=np.int32), label_value) | |
| return mask, comments, is_sentence | |
| if __name__ == "__main__": | |
| data_dir = "./train" | |
| vis_dir = "./vis" | |
| if not os.path.exists(vis_dir): | |
| os.makedirs(vis_dir) | |
| json_path_list = sorted(glob.glob(data_dir + "/*.json")) | |
| for json_path in json_path_list: | |
| img_path = json_path.replace(".json", ".jpg") | |
| img = cv2.imread(img_path)[:, :, ::-1] | |
| # In generated mask, value 1 denotes valid target region, and value 255 stands for region ignored during evaluaiton. | |
| mask, comments, is_sentence = get_mask_from_json(json_path, img) | |
| ## visualization. Green for target, and red for ignore. | |
| valid_mask = (mask == 1).astype(np.float32)[:, :, None] | |
| ignore_mask = (mask == 255).astype(np.float32)[:, :, None] | |
| vis_img = img * (1 - valid_mask) * (1 - ignore_mask) + ( | |
| (np.array([0, 255, 0]) * 0.6 + img * 0.4) * valid_mask | |
| + (np.array([255, 0, 0]) * 0.6 + img * 0.4) * ignore_mask | |
| ) | |
| vis_img = np.concatenate([img, vis_img], 1) | |
| vis_path = os.path.join( | |
| vis_dir, json_path.split("/")[-1].replace(".json", ".jpg") | |
| ) | |
| cv2.imwrite(vis_path, vis_img[:, :, ::-1]) | |
| print("Visualization has been saved to: ", vis_path) | |