验证码切割报错

[yanwii]

环境：
opencv-python 4.0.0.21

错误为：

Traceback (most recent call last):
  File "captcha_generator.py", line 188, in <module>
    letter_image_regions = extract(image, str=captcha_correct_text)
  File "captcha_generator.py", line 79, in extract
    (x, y, w, h) = cv2.boundingRect(contour)
cv2.error: OpenCV(4.0.0) /io/opencv/modules/imgproc/src/shapedescr.cpp:741: error: (-215:Assertion failed) npoints >= 0 && (depth == CV_32F || depth == CV_32S) in function 'pointSetBoundingRect'

[Forever22]

出错上面的一行代码
contours = contours[0] if imutils.is_cv2() else contours[1]
改成
contours = contours[0]