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I have calculated the variance of an image.now i need to classify the pixels as foreground when the variance is more than a threshold ,otherwise it is classified as background pixel.how to select this threshold

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Image Analyst
Image Analyst 2013-11-10
编辑：Image Analyst 2013-11-10

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It doesn't make sense to do what you said globally - just think about it.
There are several ways to do it locally adaptive: blockproc(), stdfilt(), nlfilter(), nested for loops, etc.
I show two of these in the demo attached below.

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