Case Study #2 - Filtering for Porous SurfacesMany production measurements of surfaces can be strongly influenced by extraneous peaks (debris) or valleys (pits, pores, etc.). These extraneous features can cause significant distortions in the waviness profile and can corrupt many roughness and waviness parameters. OmniSurf incorporates the "valley suppression" filtering methodology put forth in ISO 13565-1996 as well as a new "robust filtering" approach. This robust filtering technique provides a more stable and functional meanline (without the unwanted distortions) and as a result gives more meaningful roughness and waviness profiles and values.