OpenCV(3.4.1) Error: Assertion failed (scn == 3 || scn == 4) in cv::cvtColor, file D:\Build\...

错误：OpenCV(3.4.1) Error: Assertion failed (scn == 3 || scn == 4) in cv::cvtColor, file D:\Build\OpenCV\opencv-3.4.1\modules\imgproc\src\color.cpp, line 11147
Traceback (most recent call last):

cv2.error: OpenCV(3.4.1) D:\Build\OpenCV\opencv-3.4.1\modules\imgproc\src\color.cpp:11147: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

关于这个错误

img = cv2.imread('images/chess_board.jpg')

img = cv2.imread('chess_board.jpg')

这下好了

文章来源: OpenCV(3.4.1) Error: Assertion failed (scn == 3 || scn == 4) in cv::cvtColor, file D:\Build\...