json2yolo

写了一个labelme的rectangle json文件转yolo格式的脚本，欢迎点赞使用~~~

话不多说直接上代码~

import json
import glob
 
def load(file,out_dir):
    # YOLOv5使用的标签映射，将LabelMe标签映射到对应的类别索引
    label_mapping = {
        'box': 0,
    }
    path = glob.glob(f'{file}\*.json')
    for i in path:
        try:
            with open(i, 'r',encoding='utf-8') as f:
                data = json.load(f)
 
                # 转换每个标注
                yolo_annotations = []
                for annotation in data['shapes']:
                    label = annotation['label']
                    class_index = label_mapping.get(label)
                    if class_index is not None:
                        x, y = annotation['points'][0]
                        width = annotation['points'][1][0] - x
                        height = annotation['points'][1][1] - y
                        x_center = (x + width / 2) / data['imageWidth']
                        y_center = (y + height / 2) / data['imageHeight']
                        width /= data['imageWidth']
                        height /= data['imageHeight']
                        yolo_annotations.append(f"{class_index} {abs(x_center)} {abs(y_center)} {abs(width)} {abs(height)}")
                        name = i.split('.')[0].split('\\')[1]
                        # 将转换后的标注写入txt文件
                        with open(f'{out_dir}\{name}.txt', 'w') as f:
                            for annotation in yolo_annotations:
                                f.write(annotation + '\n')
        except:
            print(i)
            pass
        
json_dir = 'js'
out_dir='txt'
load(json_dir,out_dir)