【踩坑记录】Opencv提取轮廓时出错

报错代码

这里就是想提取一下轮廓，谁知道就崩了呢？！：

# 轮廓检测
cnts = cv2.findContours(edged.copy(), cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)[1]
cnts = sorted(cnts, key = cv2.contourArea, reverse = True)[:5]

-错误提示

提示：Traceback (most recent call last): cnts = sorted(cnts, key = cv2.contourArea, reverse = True)[:5]cv2.error: OpenCV(4.5.5) D:\a\opencv-python\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’

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解决方案：

提示：将 findContours(...)[1] 改为findContours(...)[0]

错误原因：应该是opencv的版本不同导致的