ISO 17850-2015 PDF

Full title and description

Photography — Digital cameras — Geometric distortion (GD) measurements. This International Standard specifies a protocol and test methods for measuring geometric distortion produced by digital still cameras (including camera phones) so that measurements from different laboratories and instruments can be compared consistently.

Abstract

ISO 17850:2015 defines measurement procedures, test-chart requirements (dot-chart method), data extraction and calculation steps needed to quantify geometric distortion (GD) of digital cameras. The standard is intended to allow repeatable, comparable GD measurements across equipment and laboratories and applies to a wide range of digital still cameras including mobile-phone cameras.

General information

• Status: Published.
• Publication date: 2015-07 (Edition 1, 2015).
• Publisher: International Organization for Standardization (ISO), technical committee ISO/TC 42 (Photography).
• ICS / categories: 37.040.01 (Photography in general).
• Edition / version: Edition 1 (2015).
• Number of pages: 48 pages (ISO published length).

Scope

Specifies a protocol to measure geometric distortion of digital cameras. It covers test-chart design (dot patterns), measurement geometry and positioning, procedures for image capture, methods to locate dot centres and derive geometric-distortion maps, and guidance for reporting results so that measurements are comparable between laboratories. The standard explicitly states applicability to digital still cameras including camera phones.

Key topics and requirements

• Definition of geometric distortion and reporting conventions for GD measurements.
• Requirements for test charts (dot-chart method), layout and tolerances.
• Measurement geometry: camera-to-chart alignment, distance, and illumination conditions.
• Image capture procedures and recommended camera settings for GD testing.
• Algorithms and procedures to detect dot centers and compute local and global distortion.
• Calculation and presentation of distortion maps and numerical GD metrics.
• Guidance on instrument calibration, measurement uncertainty and result reporting.
• Procedures intended to enable inter-laboratory comparability of results.

Typical use and users

Used by camera manufacturers, imaging laboratories, test houses, R&D teams, and standards bodies to quantify and compare geometric distortion in digital still cameras and camera modules (including mobile-phone cameras). Also used by imaging-system evaluators, quality engineers, and researchers developing or validating lens correction algorithms and camera calibration procedures.

Related standards

ISO 17850:2015 is part of the family of ISO photography/camera-measurement standards produced by ISO/TC 42. Closely related documents include ISO 19084:2015 (Chromatic displacement measurements) and ISO 12233 (resolution and SFR measurements), among other ISO/TC 42 camera test methods and guidance. These standards are commonly used together for comprehensive camera performance characterization.

Keywords

geometric distortion; GD; digital camera testing; camera calibration; dot chart; measurement protocol; imaging standards; ISO 17850; camera phones; test chart.

FAQ

Q: What is this standard?

A: ISO 17850:2015 is an International Standard that defines a protocol and procedures for measuring geometric distortion (GD) in digital still cameras, including mobile-phone cameras.

Q: What does it cover?

A: It covers test-chart requirements (notably the dot-chart method), measurement geometry and capture procedures, algorithms for locating chart features and computing distortion, presentation of distortion maps and metrics, and guidance on calibration and uncertainty so results are comparable between laboratories.

Q: Who typically uses it?

A: Camera and lens manufacturers, independent test laboratories, imaging researchers, quality engineers, and anyone performing objective measurements of camera geometric distortion for product development, QA or comparative testing.

Q: Is it current or superseded?

A: ISO 17850 was published in 2015 (Edition 1, 2015) and is listed as a published International Standard. (ISO periodically reviews standards; users should check ISO/TC 42 or national bodies for the latest review status or any revision work.)

Q: Is it part of a series?

A: Yes. ISO 17850 is one of several camera-measurement standards produced by ISO/TC 42; other complementary standards include ISO 19084 (chromatic displacement) and ISO 12233 (resolution/SFR), among others that together address different objective aspects of digital camera performance.

Q: What are the key keywords?

A: Geometric distortion, GD, digital camera testing, dot chart, camera calibration, ISO 17850, imaging standards, camera phones, measurement uncertainty.