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().
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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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