Overview
EN ISO 16610-60:2015 (CEN adoption of ISO 16610-60:2015) is a Geometrical Product Specification (GPS) standard that sets out the basic concepts of linear areal filters. It defines terminology, conceptual models and the foundational characteristics required for linear areal filtration used in surface texture and areal metrology. Linear areal filters separate a surface into long-wave (form/shape) and short-wave (texture) components and include filter types such as Gaussian, spline and wavelet filters.
Key Topics
- Scope and definitions: Clear definitions for terms such as linear areal filter, planar/cylindrical filters, phase correct filters, mean surface, weighting function, filter equation, transmission characteristic, cut-off wavelength (nesting index), filter bank, and multiresolution analysis.
- Basic filter concepts: Requirements a filter must meet to claim compliance (referenced in clauses 4.1–4.5), including linearity and behavior in a specified coordinate system (planar or cylindrical).
- Mathematical foundations:
- Weighting functions and their role in computing the mean surface.
- Filter equations as mathematical descriptions (distinct from implementation algorithms).
- Transmission characteristic (Fourier transform of the weighting function) and the definition of the cut-off wavelength (50% amplitude transmission convention).
- Discrete representations and numerical realization:
- Discrete representation of data and of the filter/weighting function.
- Discrete convolution and transfer function considerations.
- Separable filters and separable filter banks for computational efficiency and multiresolution analysis.
- Informative annexes: Concept diagrams and relationships to GPS matrix and filtration matrix models (Annexes A–C).
Applications
- Surface texture and areal metrology in manufacturing and quality control.
- Specification and verification of surface finishes on planar and cylindrical parts.
- Guidance for measurement instrument manufacturers, metrology software developers, and CAD/CAM toolchains implementing areal filtration algorithms.
- Use in statistical and frequency-domain analysis of surfaces, multiresolution decomposition (filter banks), and defining nesting indices for specifications and tolerancing.
Who should use this standard
- Metrologists and test laboratories performing areal surface characterization.
- Quality engineers and product designers who specify surface texture in tolerances.
- Developers of measurement instruments and surface-analysis software.
- Standards committees and practitioners applying GPS (Geometrical Product Specification) principles.
Related Standards
Keywords: ISO 16610-60, linear areal filters, GPS filtration, surface texture, weighting function, cut-off wavelength, transmission characteristic, filter bank, multiresolution analysis.
