[python,opencv]如何判斷一副圖片的通道數

參考：https://stackoverflow.com/questions/19062875/how-to-get-the-number-of-channels-from-an-image-in-opencv-2python opencv中對於Mat圖像有專門的屬性進行判斷。 詳見：https://blog.csdn.net/cv_walking/article/details/78315662

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