python 图片外围置零 np.pad操作

path1 = 'I:\\xj\\pillar_train_val_test\\val\\labels_half_new'
path2 = 'I:\\xj\\pillar_train_val_test\\val\\labels_half_new_draw'for filename in os.listdir(path1):img = cv2.imread(os.path.join(path1, filename), 0)shape = img.shapeimg_new = img[2:shape[0]-2, 2:shape[1]-2]img_new = np.pad(img_new, ((2,2), (2,2)), 'constant',constant_values = (0,0))cv2.imwrite(os.path.join(path2, filename), img_new)print (filename)