How to take summation of different bins of histogram

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?

Answer 1

[Image Analyst]

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(:));

[anu]

When I take summation of redCounts, greenCounts, blueCounts sepeartely then I am getting the same values for all three channels. Can you explain?

[Image Analyst]

No you're not the same values. Why do, for example, you think the 73rd bin of the green channel will have the same value (count of pixels) as the 73rd bin of the red channel, and blue channel? Even if they did for some rare situation, it won't be that way for every other bin unless your image is pure gray scale.

But it could be that "addition of different bins for every channel" is not well understood. Does that mean you want to add all the histograms together for the 3 different color channels? If so, that's what all the code I gave you does. If it doesn't mean that, then explain what it does mean.

[anu]

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.

[Image Analyst]

Neither can we, until we see your code and you upload at least two images.

Answer 2

[Azzi Abdelmalek]

 A=randi(10,5,4,3)
 B=squeeze(sum(sum(A,1)))