cv2.findContours not enough values to unpack(expected 3, got 2)
cv2.findContours not enough values to unpack(expected 3, got 2)这个报错是新版opencv findContours只返回两个参数，老版本opencv返回3个参数，
修改方法，去掉第一个参数即可
＿, contours, _ = cv2.findContours(result_window_bin, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)修改为contours, _ = cv2.findContours(result_window_bin, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
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