How to take summation of different bins of histogram

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anu 2016-7-22

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评论： Image Analyst 2016-7-25

I am new to Matlab. I have created three separate arrays rarray,garray,barray to store RGB values of an image. After this I have created histogram for these three channels. How take addition of different bins for every channel?

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Image Analyst 2016-7-22

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I don't know what you mean by "different" bins, but to add up corresponding bins, just add

redCounts = imhist(rgbImage(:,:,1));
greenCounts = imhist(rgbImage(:,:,2));
blueCounts = imhist(rgbImage(:,:,3));
overallCounts = redCounts  + greenCounts  + blueCounts ;

Of course it's even easier to do it all in one step:

overallCounts = imhist(rgbImage(:));

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anu 2016-7-25

Thanks. But I tried for 10-11 images. I am getting different values for 256 bins. But when I take the summation of redCounts, greenCounts, blueCounts separately getting the same values for all three channels. I dont why I am getting same addition for all three channels even though I tested on 5-6 images.