opencv（Python/c++）:輪廓檢測（邊界框、矩形區域，圓區域，凸輪廓，多邊形算法approxPloyDP）

Python版 找到正方形輪廓 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閾值 image,contours,hierarchy=cv2.findConto

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