Histogram Equalization

Enhances the contrast of images by transforming the values in an intensity image, or the values in the color map of an indexed image, so that the histogram of the output image approximately matches a flat histogram. This operation works pretty well for black and white images but give somewhat idiot results for color images. The reason relies on the fact that for color images each color band is independently equalized and then a color image is rebuilt. I know that is not the way the thing should be done, but the correct operation (which is followed in Region-Of-Interest) is very slow and memory consuming. When an image is equalized, the original image is saved in memory and selecting this operation again restores that original image. This can be used for undoing other image operations (like illuminations).

Copyright <2010>, <Joaquim Luis>

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