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Hi Steve, I am getting back to this subject with another question. On Monday 25 July 2005 22:06, Stephen Smith wrote: > Hi - this is just in the bits of code that test for whether the USAN > (local neighbourhood of similar valued voxels to the centre voxel) is > empty or not - these constants represent the value which is generated by > the centre voxel itself - which clearly isn't of interest in judging > whether the USAN is "empty" - hence this value is first subtracted from > the USAN sum. By default, if the USAN is empty, then the algorithm reverts > to the median. If USAN is empty: (a) median is the only thing applied to the central pixel or (b) after removing salt-and-pepper noise, USAN is searched again, and is followed by "selective" Gaussian filtering, just like for any pixel with non-empty USAN. Thanks Martin