Selected Filtration Methods of the Standard ISO16610Dorothee Huser, Precision Engineering, PTB

In ISO TC 213 / WG 15 a set of filtration methods and concepts have been standardized or will be
standardized soon to detrend surface topography with regard to form, waviness, and roughness and
with regard to recognize features on different scales referred to as

• detrending and
• multi scale analysis
  respectively. The standards provide a variety of numerical methods for band pass filtration.

1. Averaging with a Gaussian kernel
2. Smoothing with cubic splines
3. Smoothing with regression polynomials (Savitzky-Golay)
4. Combined method employing Gaussian kernel together with regression polynomials
5. Combined method employing interpolating polynomials and regression polynomials