Absolute phase retrieval for defocused fringe projection three-dimensional measurement

作者：Zheng, Dongliang; Da, Feipeng^*

来源：Optics Communications, 2014, 312: 302-311.

DOI：10.1016/j.optcom.2013.09.056

• Three-dimensional measurement
• Fringe projection
• Absolute phase retrieval
• Pulse-width modulation

Defocused fringe projection three-dimensional technique based on pulse width modulation (PWM) can generate high-quality sinusoidal fringe pattet ns. It only uses slightly defficused 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 defficused, 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 (O's and 255's), which can be used for real-Lime 3D shape measurement. Both simulation and experiment demonstrate he performance of the proposed method.

• 出版日期2014-2-1
• 单位东南大学