MATLAB: Creating a matrix array for training images. Whats going on

for loopmatrix arrayvoxels

Can someone please explain what is going on in the second loop and how its happening.
N = 90
for i=1:N
    % importing files
    FName=sprintf('%d.bmp',i);
    image1=imread([FFolder1, FName]);   
    image2=imread([FFolder2, FName]);
    image3=imread([FFolder3, FName]);
    % taking the 2D image (image1-3) and sticks it into the i'th 
    % slice (plane) of a 3D image
    im1(:,:,i)=image1;      % "0"
    im2(:,:,i)=image2;      % "1"
    im3(:,:,i)=image3;      % "2"
end
% What is going on in this loop?
for i=1:N   
    im(:,:,i)=im1(:,:,i);
    im(:,:,i+N)=im2(:,:,i);
    im(:,:,i+2*N)=im3(:,:,i);
end

Best Answer

Basically you have 3 volumetric images: im1, im2, and im3. That code stacks them on top of each other to form a new volumetric image that is equal to the height of all 3 summed together (because they're stacked in the Z direction).
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