What does this Digital filter actually do? and what is it called?

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I am using a filter defined by Matrix [1 1 1 1 1;1 2 2 2 1; 1 2 4 2 1; 1 2 2 2 1; 1 1 1 1 1]; on a 2 D image with filter2. I would like to know what is the name of the filter if it has one and what exactly it does to the image?

Accepted Answer

Star Strider
Star Strider on 19 May 2022
It is a 2D FIR filter: I am not certain it has any other name.
To see what it does, plot its results —
H = [1 1 1 1 1;1 2 2 2 1; 1 2 4 2 1; 1 2 2 2 1; 1 1 1 1 1];
A = ones(25);
Y = filter2(H,A,'full');
figure
surf(Y)
.
  4 Comments
Star Strider
Star Strider on 21 May 2022
My pleasure!
I cannot determine what it does to your image with respect to light or dark pixels. It appears to emphasize the centre pixels and attenuate those outisde its specified area.

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