GB/T 26958.40-2026Geometrical product specifications (GPS) - Filtration - Part 40: Morphological profile filters: Basic concepts (English PDF)
产品几何技术规范（GPS） 滤波 第40部分：形态学轮廓滤波器：基本概念
Also coversGB/T26958.40-2026 + GBT26958.40-2026
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 28, 2026
Implementation date
January 1, 2027
Scope
GB/T 26958.40-2026 is the English-translated version of 产品几何技术规范（GPS） 滤波 第40部分：形态学轮廓滤波器：基本概念.
This is Part 40 of the geometrical product specifications (GPS) filtration series and introduces the basic concepts of morphological profile filters. Morphological filters are a way of processing measured surface profiles, and the concepts described here underpin more specific filtering parts of the series. The document is relevant to surface metrology specialists, developers of measurement software, instrument makers, and quality engineers who work with profile data.
It adopts an international standard. It was issued on 28 September 2026 and takes effect on 1 January 2027. As a GB/T document it is recommended, and it is applied by agreement or through internal quality procedures. Unlike the familiar Gaussian filter, a morphological filter follows the profile in a way that resembles a probe rolling over the surface, which is why it is of interest for functional surfaces such as seals and bearings. Readers who need to understand how Chinese standards describe this class of filter can use it as an entry point.
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Document preview — GB/T 26958.40-2026
National Standard of the People's Republic of China
- ICS
- 17.040.20
- Classification
- J04
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
GB/T 26958.40-2026 is a recommended national standard (GB/T) of the People's Republic of China, issued on 28 September 2026 by the State Administration for Market Regulation and the Standardization Administration of China, with effect from 1 January 2027.
The document adopts an international standard (ISO or IEC).
It is under the responsibility of the Standardization Administration of China.
Classification: ICS 17.040.20; CCS J04.
1 Scope
This is Part 40 of the geometrical product specifications (GPS) filtration series and introduces the basic concepts of morphological profile filters. Morphological filters are a way of processing measured surface profiles, and the concepts described here underpin more specific filtering parts of the series. The document is relevant to surface metrology specialists, developers of measurement software, instrument makers, and quality engineers who work with profile data.
It adopts an international standard. It was issued on 28 September 2026 and takes effect on 1 January 2027. As a GB/T document it is recommended, and it is applied by agreement or through internal quality procedures. Unlike the familiar Gaussian filter, a morphological filter follows the profile in a way that resembles a probe rolling over the surface, which is why it is of interest for functional surfaces such as seals and bearings. Readers who need to understand how Chinese standards describe this class of filter can use it as an entry point.
Remaining clauses in the full document
- 2 Normative references
- 3 Terms and definitions
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.
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Related Standards
GB/T 26958.1-2025 — Geometrical product specifications (GPS) - Filtration - Part 1: Overview and basic concepts
GB/T 26958.20-2025 — Geometrical product specifications (GPS) - Filtration - Part 20: Linear profile filters: Basic concepts
GB/T 26958.21-2020 — Geometrical product specifications (GPS). Filtration - Part 21: Linear profile filters: Gaussian filters
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GB/T 26958.40-2026
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