engleski

Raster Digital Filters in 3D Measuring of Roughness

There is a whole series of digital 3D filters, but due to the faults present in the existing filters, the research is continuing regarding new filters. The text further describes the filter developed at the Laboratory for Precise Measurements of Length at the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb (abbr: LFSB). The method consists in separation of waviness and roughness by dividing the surface into segments that are combined by a polynomial into a single area. The surface obtained in this manner represents waviness, whereas roughness is represented by the difference between the original area and the waviness. The research in order to verify the set method was carried out by the combination of the theoretical and experimental work. The theoretical work includes treatment of the simulated surfaces. These surfaces are composed of two components, simulated waviness and simulated roughness. The simulated surfaces are treated by directional and non-directional traces. The optimal filter parameters (surface network, degree of the polynomial) are determined on the basis of the amount of residual variance and 3D parameters of roughness and waviness.

surface roughness; 3D filter

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