how to divide the image into overlapping blocks?
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sehreen
il 11 Feb 2014
Commentato: Walter Roberson
il 18 Set 2017
i need to identify the duplicate regions in an image for that i have to divide the image into overlapping blocks of fixed size lets suppose 16*16 pixels and then dct is performed on each block.
Division of blocks should be performed in such a way that if the block is a square of size b × b then the square is slid by one pixel along the image from the upper left corner right and down to the lower right corner.so please tell me how can i perform such kind of division of an image.
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Walter Roberson
il 11 Feb 2014
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.
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Anand
il 11 Feb 2014
You could use the blockproc function. You would need to specify a 'BorderSize' of [1 1] and use a BlockSize of [16 16].
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TUSHAR MURATKAR
il 18 Set 2017
@image analyst, i tried in the way you explained but i got empty matrix.
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