image histogram for color constancy

Dear Sir

      If i use the imhist() for my subploting imageit will not display the histogram in my color constancy program at the same time i want to display the error ration for orginal image and gray image

Please give suggestion for me it was very helpful to me

with regards Fathima

Answer 1

[Image Analyst]

We have no knowledge of your color constancy program so we can't say why it will not display. In a regular MATLAB program with an axes, you'd do something like this:

[pixelCounts grayLevels] = imhist(grayImage, 256);
bar(grayLevels, pixelCounts, 'BarWidth', 1.0);

but that's for a gray scale image, not a color image. I also don't know what an "error ration" is. Finally, explain how you got the gray level image from the "original" image.