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Finding a 2d block with highest average inside a 2d window

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Consider a matrix A(52,34) How to find out which 2d block size(3,3) has the highest average in it

Accepted Answer

Walter Roberson
Walter Roberson on 1 Mar 2018
[~, idx] = max(conv2(A, ones(3,3),'same'))
[r, c] = ind2sub(size(A), idx);
r and c is now the index of the center of the block that had the highest average.
MSP on 2 Mar 2018
Edited: MSP on 2 Mar 2018
r and c is supposed to be single values ,isnt it.If I run with A=magic(7) then it does'nt return single values.
Walter Roberson
Walter Roberson on 2 Mar 2018
[~, idx] = max( reshape(conv2(A, ones(3,3),'same'), [], 1) );
[r, c] = ind2sub(size(A), idx);

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