Divide 256*256 image into 2*2 blocks

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niranjan v
niranjan v 2019-1-25
回答： Walter Roberson 2019-1-25
I am working on a project of image processing (watermarking) & needs to divide 256*256 image into 2*2 blocks (overlaping) to get 4096 matrices.If anyone knows about it plz help me.

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Walter Roberson
Walter Roberson 2019-1-25
if ndims(YourArray) == 2
blocks2x2 = mat2cell(YourArray, 2 * ones(1,128), 2 * ones(1,128) );
else
blocks2x2 = mat2cell(YourArray, 2 * ones(1,128), 2*ones(1,128), size(YourArray,3) );
end
(Really this can be done with just the second of those assignments without an 'if', but splitting the case permits you to avoid a warning.

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