A multi-frequency inverse-phase error compensation method for projector nonlinear in 3D shape measurement

作者：Mao, Cuili; Lu, Rongsheng^*; Liu, Zhijian

来源：Optics Communications, 2018, 419: 75-82.

DOI：10.1016/j.optcom.2018.03.006

• Phase shifting profilometry
• Non-linear phase error
• Inverse-error compensation
• Multi-frequency method

In fringe projection profilometry, the phase errors caused by the nonlinear intensity response of digital projectors needs to be correctly compensated. In this paper, a multi-frequency inverse-phase method is proposed. The theoretical model of periodical phase errors is analyzed. The periodical phase errors can be adaptively compensated in the wrapped maps by using a set of fringe patterns. The compensated phase is then unwrapped with multi-frequency method. Compared with conventional methods, the proposed method can greatly reduce the periodical phase error without calibrating measurement system. Some simulation and experimental results are presented to demonstrate the validity of the proposed approach.

• 出版日期2018-7-15
• 单位合肥工业大学; 南阳理工学院