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

錯誤：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):   File "

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