Feasibility analysis of Savitzky-Golay Filter implementation in surface texture filtering and measurement

This paper analyzes the feasibility of the Savitzky-Golay filter to be used in the characterization of surface texture measurements. First, the mathematical bases of the filter are presented. The following is the analysis of the filter behaviour against an example profile by modifying the two degrees of freedom considered: number of points of the filtering window and degree of the polynomial approximation. Additional considerations such as the behaviour against end effects and the possibility of application on 3D surfaces are also considered. Finally, an application of the filter on a series of machined probes is performed comparing the obtained results against the Gaussian and Splines filters.