Opencv old version, return three parameters:
im2, contours, hierarchy = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
To return three parameters:
Just demote OpenCV to 3.4.3.18, and input PIP install opencv python = = 3.4.3.18 in the terminal
Opencv new version call, return two parameters:
contours, hierarchy = cv2.findContours(mask, cv2.RETR_ TREE, cv2.CHAIN_ APPROX_ SIMPLE)
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