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Hi everyone, I'm trying to make a histogram specification/fitting/matching to make the illumination of an image look like a model image ( the model image is the average of several image).So i want to know if OpenCV already have the function to do this? If not, can someone give me some advice on how to make the histogram specification/fitting/matching ( i want to normalize the illumination, but Histogram equalization not work well). Here is the wiki page of histogram specification/fitting/matching: http://en.wikipedia.org/wiki/Histogram_matching