extract matrix from matrix

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Jitesh Bhanushali
Jitesh Bhanushali le 11 Avr 2014
Commenté : the cyclist le 25 Avr 2014
sir i have image of size 256*256 and i want to extract 5*5 matrix from every 8*8 block of 256*256 image what is code for this...also i want to add zeros to all 5*5 blocks and make 5*5 to 8*8 matrix of the 256*256 image ..what is code for this
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the cyclist
the cyclist le 12 Avr 2014
For your second question, how are the 5x5 blocks stored, specifically?

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the cyclist
the cyclist le 11 Avr 2014
Here is a very straightforward way to do this:
% Put in some pretend data
bigMatrix = rand(256);
% The algorithm
for ni=1:8:256
for nj = 1:8:256
i_idx = (ni-1)/8+1;
j_idx = (nj-1)/8+1;
smallMatrices{i_idx,j_idx} = bigMatrix(ni:ni+7,nj:nj+7);
smallMatrices{i_idx,j_idx}(:,6:8) = 0;
smallMatrices{i_idx,j_idx}(6:8,:) = 0;
end
end
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Jitesh Bhanushali
Jitesh Bhanushali le 24 Avr 2014
sir how to solve second issue
the cyclist
the cyclist le 25 Avr 2014
I can't help you solve the second issue until you respond to the comment I made (just under your question). How are the 5x5 blocks stored?

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