Overview
EN ISO 16610-49:2015 / ISO 16610-49:2015 is a Geometrical Product Specification (GPS) standard that specifies morphological profile filters using scale space techniques. Published by CEN/ISO, the document defines the basic terminology, mathematical concepts and usage rules needed to apply scale space methods to profile filtration in surface metrology. It updates the earlier technical specification and forms part of the ISO 16610 series on filtration and surface filtering.
Key topics and technical requirements
- Terminology and basics: Defines core terms such as scale, scale space, size distribution, anti-size distribution, opening, closing and alternating symmetrical filter.
- Scale space principle: Requires the monotone property - objects present at a given scale must persist through to zero scale (no spurious creation of objects with decreasing scale).
- Size and anti-size distributions: Introduces indexed families of openings and closings and the sieve criterion for nesting and equivalence of successive morphological operations.
- Filter types and composition: Covers how openings and closings build more complex morphological filters and describes alternating symmetrical filters that remove peaks/valleys below a given scale.
- Structuring element recommendations: Provides guidance for common structuring elements (for example, circular disk and horizontal line shapes) and a default scale space technique for profile analysis.
- Filter designation and models: Specifies naming/identification rules for scale space filters and includes annexes illustrating examples, concept diagrams, and relationships to the filtration and GPS matrix models.
Applications
- Surface texture analysis and roughness filtering: Apply scale space morphological filters to separate features by scale (peaks, valleys, waviness).
- Metrology data processing: Pre-processing of profilometer and stylus data or software-based profile datasets to extract scale-dependent features.
- Feature extraction and segmentation: Identify persistent surface objects across scales for functional analysis (e.g., wear, lubrication pockets).
- Standardized reporting: Ensure consistent filtration methodology in specifications, quality control and contractual documents.
Who should use this standard
- Metrologists and surface texture analysts
- Quality and inspection engineers in manufacturing
- Measurement instrument and software developers (profilers, analysis tools)
- Standards committees and technical buyers drafting surface specifications
Related standards
- ISO 16610-1:2015 - Overview and basic terminology (normative reference)
- ISO 16610-40:2015 - Morphological profile filters: basic concepts
- Other parts of the ISO 16610 series covering linear, robust and areal filters
Keywords: ISO 16610-49, morphological profile filters, scale space techniques, GPS filtration, surface metrology, size distribution, sieve criterion, monotone property.
