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.
matlabbe
commented
10 months ago
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.