Multi-frequency inverse-phase fringe projection profilometry for nonlinear phase error compensation

Multi-frequency inverse-phase fringe projection profilometry for nonlinear phase error compensation
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用于非线性相位误差补偿的多频反相条纹投影轮廓测量法

DOI:
10.1016/j.optlaseng.2014.09.018
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发表时间:
2015-03
影响因子:
4.6
通讯作者:
Zhou Canlin
Zhou Canlin
中科院分区:
工程技术2区
文献类型:
--
作者:
Lei Zhenkun;Wang Chunli;Zhou Canlin

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为了补偿条纹投影轮廓术中的非线性相位误差,测量不连续物体的三维形状,提出了一种新的多频反相位测量方法。在多频四步移相方法中引入π/4的相移后,相应的非线性相移误差的符号反转,从而允许在相移运算前后增加展开的相位来补偿误差。对于四步移相方法,仿真分析表明,非线性相移误差使条纹频率增加了四倍。实验结果验证了该方法的可行性和适用性。
A new multi-frequency inverse-phase method was proposed to compensate for nonlinear phase errors in fringe projection profilometry and to measure the three-dimensional shape of discontinuous objects. After introducing a phase offset ofπ/4 into the multi-frequency four-step phase-shifting method the corresponding nonlinear phase error reversed its sign, which allowed the addition of unwrapped phases before and after the phase-offset operation to compensate for the error. For the four-step phase-shifting method, simulation analysis showed that the nonlinear phase error had quadrupled the fringe frequency. Moreover, experimental results verified the feasibility and applicability of the proposed method.
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