GB/T 26958.21-2020Geometrical product specifications (GPS). Filtration - Part 21: Linear profile filters: Gaussian filters (English PDF)

Foreword

GB/T 26958 "Geometric Technical Specifications for Products (GPS) Filtering" is divided into 89 parts, and the following 12 parts have been released.

---Part 1: Overview and basic concepts;

---Part 20: Basic concepts of linear contour filters;

---Part 21: Linear contour filter Gaussian filter;

---Part 22: Linear contour filter spline filter;

---Part 28: End effect of contour filter;

---Part 29: Linear contour filter spline wavelet;

---Part 30: Basic concepts of robust contour filter;

---Part 31: Robust contour filter Gaussian regression filter;

---Part 32: Robust contour filter spline filter;

---Part 40: Basic concepts of morphological contour filter;

---Part 41: Morphological contour filter disc and horizontal line segment filter;

---Part 49: Morphological contour filter scale space technology.

This part is part 21 of GB/T 26958.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

The translation method used in this part is equivalent to the ISO 16610-21:2011 "Geometric Technical Specification for Products (GPS) Filtering Part 21: Line Characteristic contour filter Gaussian filter".

The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows:

---JJF1001-2011 General measurement terms and definitions (ISO/IEC Guide 99:2007, MOD);

---JJF1059.1-2012 Measurement Uncertainty Evaluation and Expression (ISO/IEC Guide 98-3:2008, MOD). This section has made the following editorial changes.

---Rewrite Appendix D in accordance with the requirements of GB/T 20308-2020.

1 Scope

This part of GB/T 26958 specifies the metrological characteristics of Gaussian filters for contour filtering, and gives the long wave and shortwave component method.

This section applies to the extraction of surface profile roughness features, and other signal filtering and analysis occasions can be used as a reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/Z 26958.1-2011 Product Geometric Technical Specification (GPS) Filtering Part 1: Overview and Basic Concepts (ISO/TS 16610-1:2006, IDT)

GB/Z 26958.20-2011 Geometric Technical Specifications for Products (GPS) Filtering Part 20: Basic Outline of Linear Contour Filter Read (ISO/TS 16610-20:2006, IDT)

ISO/IEC Guide 98-3:2008 Measurement Uncertainty Evaluation and Expression [Uncertaintyofmeasurement-Part 3:Guide totheexpressionofuncertaintyinmeasurement(GUM:1995)]

ISO/IEC Guide 99:2007 General Metrology Terms and Definitions [Internationalvocabularyofmetrology-Basicand generalconceptsandassociatedterms(VIM)]

3 Terms and definitions

The terms and definitions defined in GB/Z 26958.1, GB/Z 26958.20, ISO/IEC Guide 98-3 and ISO/IEC Guide 99 are applicable to this document. For ease of use, some terms and definitions in GB/Z 26958.1 and GB/Z 26958.20 are listed repeatedly below.