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    How do I create a multivariate image from separate images?

Possible Solutions:

    If you are performing PCA on a multivariate image, you may need to construct a 3 dimensional (MxNxP) array where each image is MxN pixels and there are P images. An easy way to do this is using the Matlab cat() command.
    >>mvimg = cat(3, img1, img2, img3);
    Note the first argument = 3, this indicates the concatenation is occurring along the 3rd dimension.

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