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分区域Gamma预编码校正的相位误差补偿

Subregional Gamma Pre-coding Correction for Phase Error Compensation

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摘要

针对现有结构光视觉测量中普通投影仪亮度不均匀引起系统Gamma 非线性畸变值分布差异,从而导致相位误差问题,提出了一种自适应分区域Gamma 预编码校正方法。首先,介绍了结构光双目视觉测量原理以及标准N 步相移法。接着,分析了投影仪和相机的Gamma 非线性畸变对光栅正弦性的影响以及预编码校正方法。然后,在获取Gamma 值分布规律的基础上,根据Gamma 值的变化与相位误差的关系确定分区域阈值大小。最后,根据确定的阈值对测量视场进行区域划分,获取各区域Gamma 值,并对标准白板和汽车挡泥板进行了实际测量。实验结果表明:本文方法比相同条件下采用单一Gamma 值预编码校正方法在相位误差的补偿精度上提高了约30%,在三维数据的测量精度上提高了约15%。该方法能更好地减小相位误差,提高结构光视觉测量系统的精度。

Abstract

In structured light vision measurement, since non-uniformity of brightness of the common projector caused nonlinear distortion Gamma value distribution difference resulting in phase error problem, a self-adaptive subregional Gamma value pre-coding correction method was proposed. First, the principle of structured light stereo vision measurement and standard N step phase shifting method is introduced. Second, the projector and the camera's nonlinear distortion of sine grating and the Gamma value pre-coding correction method are analyzed. Then, on the basis of Gamma value distribution, according to the relationship between the change of Gamma value and the phase error, subregional threshold was calculated. Finally, according to the threshold, the measurement field was divided and subregional Gamma pre-coding correction method was implemented, and actual measurement was carried out on a standard white plate and a fender. Experimental results indicate, under the same conditions, compared with single Gamma pre-coding correction method, the proposed method can further improve phase error compensation about 30%, and the measurement accuracy increase by about 15% in the 3D data.

Newport宣传-MKS新实验室计划
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中图分类号:TB92;P391

DOI:10.3969/j.issn.1003-501x.2016.09.006

所属栏目:光电测量与检测

基金项目:国家科技支撑计划项目(2015BAF24B01);福建省科技计划重点项目(2008H0085);福建省科技重大专项专题项目(2014HZ0004-3)

收稿日期:2016-01-11

修改稿日期:2016-03-28

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作者单位    点击查看

林俊义:华侨大学 福建省特种能场制造重点实验室厦门市数字化视觉测量重点实验室,福建 厦门 361021
黄剑清:华侨大学 福建省特种能场制造重点实验室厦门市数字化视觉测量重点实验室,福建 厦门 361021
江开勇:华侨大学 福建省特种能场制造重点实验室厦门市数字化视觉测量重点实验室,福建 厦门 361021

联系人作者:林俊义(ljy2004@hqu.edu.cn)

备注:林俊义(1977-),男(汉族),福建莆田人。副教授,硕士,主要从事机器视觉方面的研究。

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引用该论文

LIN Junyi,HUANG Jianqing,JIANG Kaiyong. Subregional Gamma Pre-coding Correction for Phase Error Compensation[J]. Opto-Electronic Engineering, 2016, 43(9): 32-38

林俊义,黄剑清,江开勇. 分区域Gamma预编码校正的相位误差补偿[J]. 光电工程, 2016, 43(9): 32-38

被引情况

【1】刘超,盖绍彦,达飞鹏. 结构光测量中分区域相位误差补偿方法研究. 中国激光, 2018, 45(6): 604002--1

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