How can I make a joint histogram of 3D matrices?

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Joaquim
Joaquim 2017-2-9
Hello everybody,
I'm trying to make a joint histogram of 3D matrices. Does anybody have any idea how to make it. I applied this code to a 2D matrix, but the output is a black image.
function h=joint_histogram(image_1,image_2)
rows=size(image_1,1);
cols=size(image_1,2);
N=256;
h=zeros(N,N);
for i=1:rows; % col
for j=1:cols; % rows
h(image_1(i,j)+1,image_2(i,j)+1)= h(image_1(i,j)+1,image_2(i,j)+1)+1;
end
end

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