GB/T 43042-2023 English PDF

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GB/T 43042-2023: Digital cameras - Geometric distortion (GD) measurements
Status: Valid

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Basic data

Standard ID: GB/T 43042-2023 (GB/T43042-2023)
Description (Translated English): Digital cameras - Geometric distortion (GD) measurements
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: N46
Classification of International Standard: 37.040.10
Word Count Estimation: 46,460
Date of Issue: 2023-09-07
Date of Implementation: 2024-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 43042-2023: Digital cameras - Geometric distortion (GD) measurements

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 37.040.10 CCSN46 National Standards of People's Republic of China Measurement of Geometric Distortion (GD) of Digital Cameras [ISO 17850.2015,Photography-Digitalcameras- Published on 2023-09-07 2024-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Table of contents

Preface III 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 4 Measurement method 2 4.1 Overview 2 4.2 Local geometric distortion 3 4.3 Linear geometric distortion 3 5 Requirements 3 5.1 Instruments and Hardware 3 5.2 Light source 4 5.3 Bitmap 5 5.4 Grid diagram 6 5.5 Camera settings 7 6 Determination of geometric distortion8 6.1 Local geometric distortion8 6.2 Linear geometric distortion10 7 Result Expression 11 7.1 Overview 11 7.2 Local geometric distortion 11 7.3 Linear geometric distortion 12 Appendix A (Informative) Examples and Verification 13 Appendix B (informative) Taking points from the target 14 B.1 Principle 14 B.2 Area of interest for finding points14 Appendix C (informative) Point center verification 21 C.1 Point Center Verification 21 C.2 AMD Reference Image 21 C.3 Reference image of laboratory A22 Appendix D (informative) Grid sorting 26 D.1 Overview 26 D.2 Initialization 26 D.3 Grid establishment 27 Appendix E (Informative) Subjective Evaluation Example 34 Reference 41

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is equivalent to ISO 17850.2015 "Measurement of Geometric Distortion (GD) of Photographic Digital Cameras". This document has made the following minimal editorial changes. ---The name of the standard was changed to "Measurement of Geometric Distortion (GD) of Digital Cameras". Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents. This document is proposed by China Machinery Industry Federation. This document is under the jurisdiction of the National Photographic Equipment Standardization Technical Committee (SAC/TC107). This document was drafted by. Hangzhou Photographic Mechanical Research Institute Co., Ltd., Shanghai Pulisheng Mechanical and Electrical Technology Co., Ltd., Jiaxing Zhongrun Optical Science and Technology Co., Ltd. Technology Co., Ltd., Guangdong Sirui Optical Co., Ltd., and Hangzhou Guozhao Inspection Technology Co., Ltd. The main drafters of this document. Ge Shiqing, Li Tongyue, Hou Feng, Zhang Jie, Li Jie, Xu Yuzhao. Measurement of Geometric Distortion (GD) of Digital Cameras

1 Scope

This document defines relevant terms and definitions for measurement methods of geometric distortion of digital cameras, and describes two types of geometric distortion of digital cameras. measurement method. This document applies to the measurement of geometric distortion in digital cameras and camera phones.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. ISO 14524 Method of measurement of optical-to-electrical conversion functions (OECFs) of photographic electronic still cameras [Photography-Electronic Note. GB/T 19894-2005 Measurement method of optical-electrical conversion functions (OECFs) of digital cameras (ISO 14524.1999, IDT) IEC 61146-1 Cameras (PAL/SECAM/NTSC) Measurement methods Part 1.Non-broadcast single sensor cameras sensorcameras]

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 geometricdistortiongeometricdistortion GD In a stored image of a digital camera, a displacement away from the theoretical shape of an object (located on a plane parallel to the image plane). NOTE. Geometric distortion basically comes from changes in the lateral magnification of the camera lens's field of view, causing straight lines to be rendered as curves. There are other factors that may arise Geometric distortion, for example, rotational asymmetry of a camera lens or positional changes during camera imaging. 3.2 image heightimageheight 3.2.1 image heightimageheight Expressed as the distance between an image point and the center of the image area or its relative value normalized by half of the diagonal of the image area. Note. This is an extension of the definition of optical system measurement in ISO 9039. 3.2.2 actual image height actualimageheight The image height of the actual recorded image point within the image area recorded by a digital camera. Note 1.“Actual recorded image points” correspond to “observed image points” in ISO 9039. ......

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