MATLAB: How to make nested loop from 8×8 block for image size 512×512

for loopnested for loop

i have an image with size 512×512, then i make a 8×8 block so there is 4096 block, i want to calculate variance function in each block, how to make a for loop kx so one block kx will calculate and move again in second block then calculate again so it will calculate all 4096 block, i'm stuck just only one row inside of first block, can someone help me? thank u

 i []; j[];
 for k=1:4096
    kx=(x{k});% extracting block into kx for processing
         for i = 1:8
              for j = 1:8
                 Variance = var(kx);
              end
         end
 end

Best Answer

This will help you:

https://in.mathworks.com/matlabcentral/answers/362262-i-have-a-32-32-matrix-i-want-to-take-mean-of-each-4-4-so-that-the-matrix-is-reduced-to-8-8-array

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MATLAB: Finding block with minimum mean in cell array

Get the mean for each block using cellfun, and apply a sort to get the indices in order.

M = cellfun (@(x) mean(x(:)), salientMask_B128x12) ;
[Msorted, idx] = sort(M(:)) ;
RequiredIndices = idx(1:4)

MATLAB: How to divide the image into overlapping blocks

See mat2cell() to divide the array into cells. Start by letting the CurrentImage be the original image. Then repeat

T = CurrentImage;
%throw away partial blocks
T(end-mod(size(T,1),16)+1:end, :) = [];
T(:, end-mod(size(T,2),16)+1:end) = [];
now break out of loop if T is empty

Now you can mat2cell to extract 16 x 16 blocks. Store them. Then,

CurrentImage = CurrentImage(2:end,2:end);

and start loop over again. You would be extracting the blocks one over and one down from the first set of blocks. Next iteration you would be going with one over and one down from that, and so on.

Best Answer

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