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Technical Discussions related to Image Processing (image coding, compression, digital effects, mpeg, etc)

  

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Color histogram - zary...@yahoo.com - Aug 31 5:50:00 2005



Hello,
I need help on creating a color histogram in Matlab. Now, I understand that for using the imhist(), it can only be used for grayscale or indexed images right? Thus we first need to convert it, say from RGB to index by using rgb2ind function.

I've created color histogram, but I'm not sure on how to read it. Or rather, i'm not really sure if this is the correct color histogram. Here's some codes to illustrate my problem.

RGB = imread('7.jpg');
[X,map] = rgb2ind(RGB,256);
imhist(X);
colorbar;
colormap(map)

the image source is -> http://server3.uploadit.org/files/zaryl2-7.jpg
the color histogram -> http://server2.uploadit.org/files/zaryl2-colhist.jpg

Please tell me whether I've constructed the correct color histogram or not. If not, then can you guys tell me the correct method of creating one.

Thanks!
Zaryl





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