Absolute phase retrieval for defocused fringe projection three-dimensional measurement
Absolute phase retrieval for defocused fringe projection three-dimensional measurement
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DOI：
10.1016/j.optcom.2013.09.056
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发表时间：
2014-02
影响因子：
2.4
通讯作者：
Dongliang Zheng;F. Da
中科院分区：
文献类型：
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作者：
Dongliang Zheng;F. Da
基于脉宽调制(PWM)的散焦条纹投影三维技术可以产生高质量的正弦条纹图案。它只使用轻微离焦的二值结构图案，可以消除伽马问题(即非线性响应)，并且可以显著减小相位误差。然而，当投影仪散焦时，很难从包裹的相位中恢复绝对相位。最近提出的一种相位编码方法对绝对相位恢复是有效的，但伽马问题导致该方法不太可靠。在本文中，我们使用脉宽调制技术来产生用于相位编码方法的条纹图。可以消除投影仪的伽马问题，恢复正确的绝对相位。该方法仅使用两个灰度值(0‘S和255’S)，可用于实时的三维形状测量。仿真和实验都证明了该方法的有效性。
Defocused fringe projection three-dimensional technique based on pulse-width modulation (PWM) can generate high-quality sinusoidal fringe patterns. It only uses slightly defocused binary structured patterns which can eliminate the gamma problem (i.e. nonlinear response), and the phase error can be significantly reduced. However, when the projector is defocused, it is difficult to retrieve the absolute phase from the wrapped phase. A recently proposed phase coding method is efficient for absolute phase retrieval, but the gamma problem leads this method not so reliable. In this paper, we use the PWM technique to generate fringe patterns for the phase coding method. The gamma problem of the projector can be eliminated, and correct absolute phase can be retrieved. The proposed method only uses two grayscale values (0's and 255's), which can be used for real-time 3D shape measurement. Both simulation and experiment demonstrate the performance of the proposed method.