一种消除周期性毛刺相位误差的互补格雷码双N步相移法
A complementary Gray code double N-step phase-shifting method for eliminating periodic spurious tones phase errors
韩叔桓 1杨延西 1张新雨 2李昕杰2
作者信息
- 1. 西安理工大学自动化与信息工程学院 西安 710048;陕西省复杂系统控制与智能信息处理重点实验室 西安 710048
- 2. 西安理工大学自动化与信息工程学院 西安 710048
- 折叠
摘要
互补格雷码双N步相移法因其具有鲁棒性好、检测精度高等特点在条纹投影轮廓术领域成为研究热点.然而,传统互补格雷码双N步相移法存在检测效率低以及未消除周期性毛刺相位误差的问题.针对这些问题,本文对传统互补格雷码双N步相移法进行改进消除周期性毛刺相位误差,首先通过相机捕获形变条纹图像并计算出两组截断相位,然后利用两组截断相位的相关性消除检测数据中的相位差、周期性毛刺相位误差,再对两组截断相位进行融合,最后通过互补格雷码相位展开法对融合后的截断相位进行相位展开.实验得出本文方法在检测效率不变的情况下,能有效消除周期性毛刺相位误差,得到高精度展开相位,相比于未消除周期性毛刺相位误差的互补格雷码双N步相移法,本文检测方法精度提高了约24.57％,相比于互补格雷码N步相移法,本文检测方法精度提高了约6.29％.
Abstract
The complementary Gray code double N-step phase-shifting method has become a research hotspot in the field of fringe projection profilometry because of its good robustness and high detection accuracy.However,the traditional complementary Gray code double N-step phase-shifting method has the problems of low detection efficiency and does not eliminate the periodic spurious tones phase error.To solve these problems,the traditional complementary Gray code double N-step phase-shifting method is improved to eliminate periodic spurious tones phase errors in this paper.Firstly,the deformed fringe images are captured by camera to calculate two groups of wrapped phases.Next,the correlation of the two groups of wrapped phases is used to eliminate the phase difference and periodic spurious tones phase error in the detection data,and the two groups of wrapped phases are fused.Finally,the fused wrapped phase is unwrapped by the complementary Gray code phase unwrapping method.The experimental results show that the method in this paper could effectively eliminate the periodic spurious tones phase error and obtain the high-precision unwrapped phase,compared to the complementary Gray code double N-step phase-shifting method that does not eliminate periodic spurious tones phase errors,the accuracy of the detection method in this paper has been improved by about 24.57％.Compared with the complementary Gray code N-step phase-shifting method,the accuracy of the detection method in this paper has been improved by about 6.29％.
关键词
双N步相移法/展开相位/周期性毛刺相位误差/互补格雷码Key words
double N-step phase shift method/wrapped phase/periodic spurious tones phase error/complementary gray code引用本文复制引用
基金项目
国家自然科学基金(62273274)
国家自然科学基金(62003261)
出版年
2024
NETL
NSTL
万方数据