sliding window operation in image

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I have an image of size 256*256, i want to use 3*3 window which slides over image and change the value of central pixel as sum of neighbouring 8 pixels. Please Help.

Accepted Answer

Image Analyst
Image Analyst on 26 Jun 2014
Try conv2(), imfilter(), nlfilter(), or, if you want to move in "jumps" instead of by one pixel, blockproc().
VIJENDRA on 9 Oct 2014
one can use nlfilter or blockprop.
Image Analyst
Image Analyst on 10 Oct 2014
Sorry, for some reason I didn't see your follow up question from June until now. Please see my demo of nlfilter where you can have it perform your own custom operation/filter on the window at each location.

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