Optimized pulse width modulation pattern strategy for three-dimensional profilometry with projector defocusing
Optimized pulse width modulation pattern strategy for three-dimensional profilometry with projector defocusing
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DOI：
10.1364/ao.51.004477
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发表时间：
2012-07-01
期刊：
影响因子：
1.9
通讯作者：
Sui, Xiubao
中科院分区：
文献类型：
--
作者：
Zuo, Chao;Chen, Qian;Sui, Xiubao
采用相移算法的正弦条纹投影三维轮廓术通常会因商用视频投影仪的非线性强度响应而失真。为了克服这一问题，提出了包括正弦脉宽调制（SPWM）的几种方法，通过对投影进行一定程度的离焦来产生二值正弦条纹图。然而，对于高精度的测量领域，残余误差通常是不可忽略的，特别是当离焦水平不足时。在这项工作中，我们提出了两种新的方法，以进一步提高散焦技术。我们发现，根据一定的标准适当优化SPWM模式，并将SPWM技术与四步移相算法相结合，主要的不期望谐波将不会对获得的相位产生影响。我们还提出了一种新的正弦条纹产生技术，称为三极SPWM，它可以产生理想的正弦条纹图案与一个非常小的程度的散焦。仿真和实验验证了这两种技术的性能。(c)2012美国光学学会
Three-dimensional profilometry by sinusoidal fringe projection using phase-shifting algorithms is usually distorted by the nonlinear intensity response of commercial video projectors. To overcome this problem, several methods including sinusoidal pulse width modulation (SPWM) were proposed to generate sinusoidal fringe patterns with binary ones by defocusing the project to some certain extent. However, the residual errors are usually nonnegligible for highly accurate measurement fields, especially when the defocusing level is insufficient. In this work, we propose two novel methods to further improve the defocusing technique. We find that by properly optimizing SPWM patterns according to some criteria, and combining SPWM technique with four-step phase-shifting algorithm, the dominant undesired harmonics will have no impact on the phase obtained. We also propose a new sinusoidal fringe generation technique called tripolar SPWM, which can generate ideal sinusoidal fringe patterns with a very small degree of defocusing. Simulations and experiments are presented to verify the performance of these two proposed techniques. (c) 2012 Optical Society of America