[python,opencv]如何判断一副图片的通道数

参考：https://stackoverflow.com/questions/19062875/how-to-get-the-number-of-channels-from-an-image-in-opencv-2python opencv中对于Mat图像有专门的属性进行判断。 详见：https://blog.csdn.net/cv_walking/article/details/78315662

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