how to select neighbouring 5 pixels of an image

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Elysi Cochin 2019-4-23

评论： Walter Roberson 2019-4-24

I wanted to take one pixel from an image say im(x,y)

then take the neighbouring 5 pixels of position im(x,y)

find the maximum value of the 5 pixels and save it in maxIm(x,y)

please can someone help me write the code - i also want to do it for all the pixels in the image, so that i get maxIm the same size as im

(5 must be 4-neighbourhood pixels, including the center pixel)

Walter Roberson 2019-4-23

imdilate(YourImage, ones(11,11) )

The 11 is determined as "5 pixels in each direction relative to the center pixel".

It is plausible that you might want ones(5,5) instead, in which case the neighbourhood would be

*****
*****
**C**
*****
*****

where C marks the center pixel.

Your question is ambiguous about what the 5 means.

Elysi Cochin 2019-4-24

No, not a vector, must be a single value

Walter Roberson 2019-4-24

YourMatrix./imdilate(YourMatrix, [0 1 0;1 1 1;0 1 0])

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