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From: sampad panda on 10 Apr 2010 11:50
I need to remove the speackle noise from a satellite image using sigma filter in matlab .I dont know how to design the code,please write me if anybody knos.thanks
From: Image Analyst on 10 Apr 2010 13:16
Write the code for sigma filter (that's simple enough assuming you already know the basics of MATLAB programming language/syntax. Then call nlfilter (in the Image Processing Toolbox, which you almost certainly have since you're dealing with images) to filter your image.

Any reason why you're using a sigma filter instead of the Knox-Thompson method? For example, you actually have salt and pepper noise rather than speckle noise.

Other links that may help:
http://www.bing.com/search?q=knox-thompson+speckle&go=&form=QBRE&qs=n&sk=
This is a search for the Knox-Thompson method for reducing speckle.

http://www.mathworks.com/matlabcentral/newsreader/view_thread/249465#644266
This is another newsgroup thread where I discussed speckle in message #2.
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