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local variation of image

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nayomi ranamuka
nayomi ranamuka 2011-5-7
I want to calculate the local standard variation in a sliding window for an image. How it should be done using matlab ??

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nayomi ranamuka
nayomi ranamuka 2011-5-8
Thank you. Regarding to your comments I've a solution also. J = colfilt(I,[5 5],'sliding',@std); I hope your suggestions for my solution.
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Wolfgang Schwanghart
Wolfgang Schwanghart 2011-5-8
Hi, your solution is good, too! The function stdfilt is probably much faster, but if this is not a problem right now, colfilt is a good alternative.

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Wolfgang Schwanghart
Hi,
http://www.mathworks.com/help/toolbox/images/ref/stdfilt.html
or
doc stdfilt
Hope this helps, Wolfgang
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Wolfgang Schwanghart
Wolfgang Schwanghart 2011-5-7
What exactly is the problem? Did you try to run the example in the documentation?
Walter Roberson
Walter Roberson 2011-5-7
J = stdfilt(I, ones(5,5));

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