What is meant by color histogram? whats the difference between normal histogram and color histogram?

What is meant by color histogram? whats the difference between normal histogram and color histogram?

Answer 1

[Youssef Khmou]

Color histogram : it computes the histogram for each channel of the image, like per example a RGB image, C.H computes hists for R G and B matrices(images).

normal histgram : as i think , it computes a histogram of Gray-Scale image ( single 2D signal ) ,

I am sure there are many submissions in the FileExchange for computing Color Histograms , here is an example by Jeff Mather :

http://www.mathworks.com/matlabcentral/fileexchange/4875-color-image-histogram