support color histogram equalization #1203
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Add support for histogram equalization of color images. Color images are first converted to YCrCb color space, and histogram equalization is performed only on the Y channel.
Why use YCrCb instead of HSV or LAB?
They should have similar results. But according to OpenCV's color conversion documentation, the Y channel of BGR2YCrCb is calculated in the same way as BGR2GRAY. Therefore, it can ensure the same effect as converting to gray image first and then performing histogram equalization.