cv2.error: OpenCV(4.1.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor' · Issue #933 · ageitgey/face_recognition · GitHub
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Can't use math mat expressions without ToMat function returning the result · Issue #38 · vvvv/VL.OpenCV · GitHub
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