Code covered by the BSD License  

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3D histogram of RGB image

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from 3D histogram of RGB image by Pavel Rajmic
Creates 3D-histogram from an RGB image in the form of balls within the RGB cube

rgb_noise_image(rows,cols,filename) 
function image = rgb_noise_image(rows,cols,filename)

% generates random RGB image of specified size

image = randi([0,255],rows,cols,3);
image = uint8(image);

if nargin > 2
    if ischar(filename)
        imwrite(image,filename)
    end
end

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