Application of structured light coding measurement technology in Mars high-resolution camera

Zhi-rui CAO; Ji-hong DONG

doi:10.37188/OPE.20212906.1420

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Application of structured light coding measurement technology in Mars high-resolution camera

Information Sciences | 更新时间：2021-07-03

- Application of structured light coding measurement technology in Mars high-resolution camera
- Optics and Precision Engineering Vol. 29, Issue 6, Pages: 1420-1429(2021)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所空间三部，吉林长春 130000
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20212906.1420
  CLC： O436
- Received：18 September 2020，
  
  Revised：16 November 2020，
  
  Published：15 June 2021
- 稿件说明：
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曹智睿,董吉洪.结构光编码测量技术在火星高分相机中的应用[J].光学精密工程,2021,29(06):1420-1429.

CAO Zhi-rui,DONG Ji-hong.Application of structured light coding measurement technology in Mars high-resolution camera[J].Optics and Precision Engineering,2021,29(06):1420-1429.
曹智睿,董吉洪.结构光编码测量技术在火星高分相机中的应用[J].光学精密工程,2021,29(06):1420-1429. DOI： 10.37188/OPE.20212906.1420.

CAO Zhi-rui,DONG Ji-hong.Application of structured light coding measurement technology in Mars high-resolution camera[J].Optics and Precision Engineering,2021,29(06):1420-1429. DOI： 10.37188/OPE.20212906.1420.

摘要

为了提高测量精度和测量效率，在火星高分相机部分工件三维形貌的测量过程中采用了结构光编码测量技术。传统的结构光编码测量技术采用正弦相移对称结合格雷码的方法，极易产生周期错位误差，严重影响测量精度。为了从原理上消除周期错位误差，提出了非对称结构光编码测量技术。首先，提出对四步正弦相移进行区域编码的概念和方法；然后，将正弦相移与格雷码进行非对称组合，通过格雷码和区域码的双重约束，将周期错位误差由一个格雷码周期的减小至一个像元。3ds Max仿真测试结果和实物测试结果表明：与传统测量技术相比较，非对称结构光编码测量技术的最大测量误差相对减小了一个数量级，均方测量误差相对减小了70%。非对称式结构光编码测量技术有效消除了周期错位误差，大幅提高了三维测量精度。

Abstract

Structured light coding measurement technology is typically adopted in the measurement of the three-dimensional topographies of components of the Mars high-resolution camera. Conventional structured light coding measurement technology employs the method of sine phase shift symmetry in combination with the Gray code， which easily produces periodic dislocation errors， significantly affecting the measurement accuracy. To eliminate the periodic dislocation error in principle， in this study， we propose an asymmetric structured light coding measurement technology. First， the concept of region encoding for four-step sinusoidal phase-shifting is proposed. Then， the sinusoidal phase-shifting is combined with cyclic code asymmetrically. Given that the cyclic code and region code vary with time， the cyclic dislocation error is reduced from one cycle to one pixel owing to the dual constraint of the cyclic code and region code. The simulation measurement results of the 3ds Max and the physical measurement results indicate that in comparison with the conventional measurement technology， the maximum measurement error of the asymmetric structured light coding measurement technology is relatively reduced by an order of magnitude， and the mean square measurement error is relatively reduced by 70%. The asymmetric structured light coding measurement technology effectively eliminates periodic misalignment errors and substantially improves the three-dimensional measurement accuracy.

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references

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