vsmooth3d is a ranking filter used for smoothing segmentation results. The filter computes the most frequent value in a 6 (or 18) neighbourhood and replaces the center pixel with this value. The pixels within the neighbourhood are weighted. This program is useful for postprocessing of segmentation results. It will produce smooth boundaries between regions.

-in input image -out output image -n type of neighbourhood used for smoothing (6 | 18 | 26). Default: 18 -iter number of iterations. Default: 1

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G.Lohmann, MPI-CBS, 2004