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A two-step phase-shifting algorithm dedicated to fringe projection profilometry
Optics and Lasers in Engineering ( IF 4.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.optlaseng.2020.106372
Yongkai Yin , Jiaqi Mao , Xiangfeng Meng , Xiulun Yang , Ke Wu , Jiangtao Xi , Baoqing Sun

Abstract Improving the time efficiency of fringe projection profilometry (FPP) is an attractive problem. For FPP using phase-shifting, it is desired to improve the efficiency by reducing the step number for phase retrieval. This paper proposes a two-step phase-shifting algorithm dedicated to FPP. Considering the physical process of FPP, the captured fringe image is formulated with two variables, i.e. surface reflectance and phase value. And a phase shift is introduced to get the two equations, which lead to the close-form solution for phase calculation. Then the phase error due to ambient light is analyzed via a line-circle model, and an algorithm of refining the phase calculation is proposed based on the estimation of the actual fringe contrast. The validity of the proposed approach is demonstrated with experiments.

中文翻译:

专用于条纹投影轮廓测量的两步相移算法

摘要 提高条纹投影轮廓仪 (FPP) 的时间效率是一个有吸引力的问题。对于使用相移的 FPP,希望通过减少相位检索的步骤数来提高效率。本文提出了一种专用于 FPP 的两步相移算法。考虑到 FPP 的物理过程,捕获的条纹图像由两个变量表示,即表面反射率和相位值。并引入相移得到两个方程,从而得到相位计算的近似解。然后通过线-圆模型对环境光引起的相位误差进行分析,并在估计实际条纹对比度的基础上提出了一种细化相位计算的算法。通过实验证明了所提出方法的有效性。
更新日期:2021-02-01
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