网上很多写的感觉不是很好，不经意间在PaddleOCR中发现一个不错的案例，特地拿来分享一下：

import os
import argparse
import json


def gen_rec_label(input_path, out_label):
    with open(out_label, 'w') as out_file:
        with open(input_path, 'r') as f:
            for line in f.readlines():
                tmp = line.strip('\n').replace(" ", "").split(',')
                img_path, label = tmp[0], tmp[1]
                label = label.replace("\"", "")
                out_file.write(img_path + '\t' + label + '\n')


def gen_det_label(root_path, input_dir, out_label):
    with open(out_label, 'w') as out_file:
        for label_file in os.listdir(input_dir):
            img_path = root_path + label_file[3:-4] + ".jpg"
            label = []
            with open(os.path.join(input_dir, label_file), 'r') as f:
                for line in f.readlines():
                    tmp = line.strip("\n\r").replace("\xef\xbb\xbf",
                                                     "").split(',')
                    points = tmp[:8]
                    s = []
                    for i in range(0, len(points), 2):
                        b = points[i:i + 2]
                        b = [int(t) for t in b]
                        s.append(b)
                    result = {"transcription": tmp[8], "points": s}
                    label.append(result)

            out_file.write(img_path + '\t' + json.dumps(
                label, ensure_ascii=False) + '\n')


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument(
        '--mode',
        type=str,
        default="rec",
        help='Generate rec_label or det_label, can be set rec or det')
    parser.add_argument(
        '--root_path',
        type=str,
        default=".",
        help='The root directory of images.Only takes effect when mode=det ')
    parser.add_argument(
        '--input_path',
        type=str,
        default=".",
        help='Input_label or input path to be converted')
    parser.add_argument(
        '--output_label',
        type=str,
        default="out_label.txt",
        help='Output file name')

    args = parser.parse_args()
    if args.mode == "rec":
        print("Generate rec label")
        gen_rec_label(args.input_path, args.output_label)
    elif args.mode == "det":
        gen_det_label(args.root_path, args.input_path, args.output_label)