sliding window operation in image

2014 6 26
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更新时间：2014 10 10
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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.

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Image Analyst
Image Analyst 2014-6-26

0 个投票

Try conv2(), imfilter(), nlfilter(), or, if you want to move in "jumps" instead of by one pixel, blockproc().

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VIJENDRA
VIJENDRA 2014-6-26
编辑：Image Analyst 2014-6-26
thanks for your reply and i see the function usage of above said function but if my function is:
function y=shannon_entro(x)
[M,N]=size(x);
y=zeros(1,N);
for l=1:N
y(l) = -( sum(x(:,l).*log(x(:,l))) );
end
then how can i implement it in 3*3 manner in image using above functions.
VIJENDRA
VIJENDRA 2014-10-9
one can use nlfilter or blockprop.
Image Analyst
Image Analyst 2014-10-10
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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