Youssra asked . 2022-03-04

Getting many outputs using blockproc

I want to apply SVD for each 4*4 blocks using the "blockproc" and get 3 outputs: U, S and V so I can reconstract all blocks together again but Matlab gets me "too many ouput arguments". How can I solve this problem?

 fun = @(block_struct) svd(block_struct.data);
[U S V] = blockproc(a, [4 4], fun)

This is the error that I have:

 Error using blockproc
Too many output arguments.

matlab , image processing , block

Expert Answer

John Williams answered . 2024-12-21 00:22:48

No, this is not possible with blockproc().

You can use something like

function r = blocksvd(block_struct)
   [U, S, V] = svd(block_struct.data);
   Spad = nan(size(U));
   Vpad = Spad;
   Spad(1:size(S,1),1:size(S,2)) = S;
   Vpad(1:size(U,1),1:size(U,2)) = U;
   r = [U; Spad; Vpad];
 end

this returns a 12 x 4 array that can be broken up again into U, S, V.

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