大神們，求解
錯誤提示： cnts = sorted(cnts, key=cv.contourArea, reverse=True)[:5]
cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\shapedescr.cpp:315: error: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) in function 'cv::contourArea'
在提取輪廓后，想對輪廓由輪廓面積大小進行排序，但一直報錯
百度找了好久也沒找到解決辦法
uj5u.com熱心網友回復：
cnts = cv2.findContours(edged.copy(), cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)[0]把最后那個1改為0就可以了
Remember that in Opencv4 cv2.findContour() only returns 2 values: contours, hierachy https://docs.opencv.org/master/d4/d73/tutorial_py_contours_begin.html.
So it should be
cnts = cv2.findContours(mask,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)[0]
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