How to replace an element with average of surrounding elements excluding that particular element?

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Shaunak Chatterjee
Shaunak Chatterjee 2022-5-28
评论： Shaunak Chatterjee 2022-5-28
This is similar to
A=[1 2 3; 4 5 6; 7 8 9];
conv2(A, ones(3), 'same') ./ conv2(ones(size(A)), ones(3), 'same');
ans =
3.0000 3.5000 4.0000
4.5000 5.0000 5.5000
6.0000 6.5000 7.0000
But this includes the central elements also. I want to exclude those elements and replace the elements by average of surrounding elements only. e.g. 1 should be replaced by 3.67, not 3.

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采纳的回答

Walter Roberson
Walter Roberson 2022-5-28
If not for boundary conditions, you could use
[1 1 1; 1 0 1; 1 1 1]/8
For boundary conditions, consider what happens if you conv2(ones(size(A)), ones(3),'same')
  1 个评论
Shaunak Chatterjee
Shaunak Chatterjee 2022-5-28
I think this may work.
window=3;
convwindow=ones(window);
convwindow(round(window/2),round(window/2))=0;
conv2(A, convwindow, 'same') ./ conv2(ones(size(A)), convwindow, 'same');
This is working for my matrix.

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