opencv（Python/c++）:轮廓检测（边界框、矩形区域，圆区域，凸轮廓，多边形算法approxPloyDP）

Python版 找到正方形轮廓 import cv2 import numpy as np img=np.zeros((200,200),dtype=np.uint8) img[50:150,50:150]=255 ret,thresh=cv2.threshold(img,127,255,0)#threshold阈值 image,contours,hierarchy=cv2.findConto

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