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SUSAN
Nonlinear Noise Reduction
Overview
SUSAN nonlinear noise reduction reduces noise, ideally without blurring the underlying image. It is necessary to choose the spatial scale of the smoothing (just as in linear Gaussian filtering), and also an intensity threshold. This intensity threshold is used to smoothly distinguish between whether variation is noise (less than the threshold) or signal (greater than the threshold).
Papers
For more information and papers on the SUSAN filter see the original SUSAN page, relating to the original SUSAN program, which found 2D corners and edges in images, and carried out 2D smoothing only.
Software
3D noise reduction using SUSAN is available as part of the FMRIB Software Library. For the original 2D SUSAN program which finds corners and edges and carries out 2D smoothing see the original SUSAN page.