labelme转yolo格式txt 目标检测和实例分割的脚本

# https://blog.csdn.net/m0_63172128/article/details/135942221
import base64
import random
import shutil
from tqdm import tqdm
import math
import json
import os
import numpy as np
import PIL.Image
import PIL.ImageDraw
import cv2


class ConvertManager(object):
    def __init__(self):
        pass

    def base64_to_numpy(self, img_bs64):
        img_bs64 = base64.b64decode(img_bs64)
        img_array = np.frombuffer(img_bs64, np.uint8)
        cv2_img = cv2.imdecode(img_array, cv2.IMREAD_COLOR)
        return cv2_img

    @classmethod
    def load_labels(cls, name_file):
        '''
        load names from file.one name one line
        :param name_file:
        :return:
        '''
        with open(name_file, 'r') as f:
            lines = f.read().rstrip('\n').split('\n')
        return lines

    def get_class_names_from_all_json(self, json_dir):
        classnames = []
        for file in os.listdir(json_dir):
            if not file.endswith('.json'):
                continue
            with open(os.path.join(json_dir, file), 'r', encoding='utf-8') as f:
                data_dict = json.load(f)
                for shape in data_dict['shapes']:
                    if not shape['label'] in classnames:
                        classnames.append(shape['label'])
        return classnames

    def create_save_dir(self, save_dir):
        images_dir = os.path.join(save_dir, 'images')
        labels_dir = os.path.join(save_dir, 'labels')
        if not os.path.exists(save_dir):
            os.makedirs(save_dir)
            os.mkdir(images_dir)
            os.mkdir(labels_dir)
        else:
            if not os.path.exists(images_dir):
                os.mkdir(images_dir)
            if not os.path.exists(labels_dir):
                os.mkdir(labels_dir)
        return images_dir + os.sep, labels_dir + os.sep

    def save_list(self, data_list, save_file):
        with open(save_file, 'w') as f:
            f.write('\n'.join(data_list))

    def __rectangle_points_to_polygon(self, points):
        xmin = 0
        ymin = 0
        xmax = 0
        ymax = 0
        if points[0][0] > points[1][0]:
            xmax = points[0][0]
            ymax = points[0][1]
            xmin = points[1][0]
            ymin = points[1][1]
        else:
            xmax = points[1][0]
            ymax = points[1][1]
            xmin = points[0][0]
            ymin = points[0][1]
        return [[xmin, ymin], [xmax, ymin], [xmax, ymax], [xmin, ymax]]

    def convert_dataset(self, json_dir, json_list, images_dir, labels_dir, names, save_mode='train'):
        images_dir = os.path.join(images_dir, save_mode) + os.sep
        labels_dir = os.path.join(labels_dir, save_mode) + os.sep
        if not os.path.exists(images_dir):
            os.mkdir(images_dir)
        if not os.path.exists(labels_dir):
            os.mkdir(labels_dir)
        for file in tqdm(json_list):
            with open(os.path.join(json_dir, file), 'r', encoding='utf-8') as f:
                data_dict = json.load(f)
            image_file = os.path.join(json_dir, os.path.basename(data_dict['imagePath']))
            if os.path.exists(image_file):
                shutil.copyfile(image_file, images_dir + os.path.basename(image_file))
            else:
                imageData = data_dict.get('imageData')
                if not imageData:
                    imageData = base64.b64encode(imageData).decode('utf-8')
                    img = self.img_b64_to_arr(imageData)
                    PIL.Image.fromarray(img).save(images_dir + file[:-4] + 'png')
            # convert to txt
            width = data_dict['imageWidth']
            height = data_dict['imageHeight']
            line_list = []
            for shape in data_dict['shapes']:
                data_list = []
                data_list.append(str(names.index(shape['label'])))
                if shape['shape_type'] == 'rectangle':
                    points = self.__rectangle_points_to_polygon(shape['points'])
                    for point in points:
                        data_list.append(str(point[0] / width))
                        data_list.append(str(point[1] / height))


                elif shape['shape_type'] == 'polygon':
                    points = shape['points']
                    for point in points:
                        data_list.append(str(point[0] / width))
                        data_list.append(str(point[1] / height))
                line_list.append(' '.join(data_list))

            self.save_list(line_list, labels_dir + file[:-4] + "txt")

    def split_train_val_test_dataset(self, file_list, train_ratio=0.9, trainval_ratio=0.9, need_test_dataset=False,
                                     shuffle_list=True):
        if shuffle_list:
            random.shuffle(file_list)
        total_file_count = len(file_list)
        train_list = []
        val_list = []
        test_list = []
        if need_test_dataset:
            trainval_count = int(total_file_count * trainval_ratio)
            trainval_list = file_list[:trainval_count]
            test_list = file_list[trainval_count:]
            train_count = int(train_ratio * len(trainval_list))
            train_list = trainval_list[:train_count]
            val_list = trainval_list[train_count:]
        else:
            train_count = int(train_ratio * total_file_count)
            train_list = file_list[:train_count]
            val_list = file_list[train_count:]
        return train_list, val_list, test_list

    def start(self, json_dir, save_dir, names=None, train_ratio=0.9):
        images_dir, labels_dir = self.create_save_dir(save_dir)
        if names is None or len(names) == 0:
            print('class names will load from all json file')
            names = self.get_class_names_from_all_json(json_dir)
        print('find {} class names :'.format(len(names)), names)
        if len(names) == 0:
            return

        self.save_list(names, os.path.join(save_dir, 'labels.txt'))
        print('start convert')
        all_json_list = []
        for file in os.listdir(json_dir):
            if not file.endswith('.json'):
                continue
            all_json_list.append(file)
        train_list, val_list, test_list = self.split_train_val_test_dataset(all_json_list, train_ratio)
        self.convert_dataset(json_dir, train_list, images_dir, labels_dir, names, 'train')
        self.convert_dataset(json_dir, val_list, images_dir, labels_dir, names, 'val')


if __name__ == '__main__':
    cm = ConvertManager()
    cm.start(r'D:\pic\pcb\shenMangKong\src_detect', r'D:\pic\pcb\shenMangKong\txt_detect')

# -*- coding: utf-8 -*-
import json
import os
import argparse
from tqdm import tqdm
import glob
import cv2
import numpy as np


def convert_label_json(json_dir, save_dir, classes):
    json_paths = os.listdir(json_dir)
    classes = classes.split(',')

    for json_path in tqdm(json_paths):
        # for json_path in json_paths:
        path = os.path.join(json_dir, json_path)
        # print(path)
        with open(path, 'r', encoding='utf-8') as load_f:
            print(load_f)
            #json_dict = json.load(load_f, encoding='utf-8')
            json_dict = json.load(load_f)
        h, w = json_dict['imageHeight'], json_dict['imageWidth']

        # save txt path
        txt_path = os.path.join(save_dir, json_path.replace('json', 'txt'))
        txt_file = open(txt_path, 'w')

        for shape_dict in json_dict['shapes']:
            label = shape_dict['label']
            label_index = classes.index(label)
            points = shape_dict['points']

            points_nor_list = []

            for point in points:
                points_nor_list.append(point[0] / w)
                points_nor_list.append(point[1] / h)

            points_nor_list = list(map(lambda x: str(x), points_nor_list))
            points_nor_str = ' '.join(points_nor_list)

            label_str = str(label_index) + ' ' + points_nor_str + '\n'
            txt_file.writelines(label_str)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='json convert to txt params')
    parser.add_argument('--json-dir', type=str, default='dataset/t1', help='json path dir')
    parser.add_argument('--save-dir', type=str, default='dataset/t2', help='txt save dir')
    parser.add_argument('--classes', type=str, default='Primary_Particle', help='classes') # 设置标签名
    args = parser.parse_args()
    json_dir = args.json_dir
    save_dir = args.save_dir
    classes = args.classes
    convert_label_json(json_dir, save_dir, classes)