Maximising Pixels within Certain area of Matrix

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Hi Everyone,
I'd like to loop through a matrix (128x128) and find the area (Lets say 5x5 Pixels) with the highest pixel values.
What is the best way to do this?
Thanks!
  2 Comments
Guillaume
Guillaume on 13 Jul 2018
Edited: Guillaume on 13 Jul 2018
What is the definition of an area with the highest pixel values? One whose sum of pixel values is the greatest? One whose maximum is the greatest? Something else?
Harry Andrews
Harry Andrews on 13 Jul 2018
Edited: Harry Andrews on 13 Jul 2018
One whose sum of pixel values is the greatest please :)
Thank you for helping!

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Accepted Answer

Guillaume
Guillaume on 13 Jul 2018
Edited: Guillaume on 13 Jul 2018
One whose sum of pixel values is the greatest
Convolve your matrix with an array of 1 the same size as the area. The location of the maximum of the convolution is the centre of the area with the highest sum:
areasum = conv2(yourmatrix, ones(5)), 'same');
[~, idx] = max(areasum);
[centrerow, centrecol] = ind2sub(size(yourmatrix), idx)

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