I am having pixel value of an image as 256X256 matrix. I want to divide it into sixteen 16X16 matrix (ie)an image into sub blocks. It is needed to compare each 16X16 with other.
You need to use mat2cell:
X = reshape(1:20,5,4)' C = mat2cell(X, [2 2], [3 2]) celldisp(C)
This code returns
X = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 C = [2x3 double] [2x2 double] [2x3 double] [2x2 double] C{1,1} = 1 2 3 6 7 8 C{2,1} = 11 12 13 16 17 18 C{1,2} = 4 5 9 10 C{2,2} = 14 15 19 2
In your case:
A = rand(256); % your matrix here N = 16*ones(1,16); B = mat2cell(A,N,N);
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