json中的样子：
{ "version": "4.5.7", "flags": {}, "shapes": [ { "label": "wood", "points": [ [ 739.3162393162394, 482.0512820512821 ] ], "group_id": null, "shape_type": "point", "flags": {} }, { "label": "wood", "points": [ [ 758.1196581196582, 458.11965811965814 ] ], "group_id": null, "shape_type": "point", "flags": {} }, ], "imagePath": "..\\img\\141.jpg", "imageData": " ....... 图片的base64编码，十分长 ........ ", "imageHeight": 1080, "imageWidth": 1920}重要的信息就是外面的points坐标，其余的都用不到。提取办法如下：
import jsonimport numpy as npimport scipy.io as sioimport scipy.io as sioimport matplotlib.pyplot as pltimport shutilimport ospath = 'D:/test/wood/yi'files = os.listdir(path)for name in files: if name.endswith('.json'): print(name) fp = open(os.path.join(path, name), 'r') json_data = json.load(fp) points_data = json_data['shapes'] points = [] for point in points_data: points.append(point['points'][0]) sio.savemat(os.path.join('./mat', name.replace('.json','.mat')), {'annPoints':points, 'num':len(points)})