Abstract

A structured light system using a digital video projector is widely used for 3D shape measurement. However, the nonlinear γ of the projector causes the projected fringe patterns to be nonsinusoidal, which results in phase error and therefore measurement error. It has been shown that, by using a small look-up table (LUT), this type of phase error can be reduced significantly for a three-step phase-shifting algorithm. We prove that this algorithm is generic for any phase-shifting algorithm. Moreover, we propose a new LUT generation method by analyzing the captured fringe image of a flat board directly. Experiments show that this error compensation algorithm can reduce the phase error to at least 13 times smaller.

© 2006 Optical Society of America

Phase error compensation for three-dimensional shape measurement with projector defocusing

Ying Xu, Laura Ekstrand, Junfei Dai, and Song Zhang
Appl. Opt. 50(17) 2572-2581 (2011)

Single-shot color fringe projection for three-dimensional shape measurement of objects with discontinuities

Meiling Dai, Fujun Yang, and Xiaoyuan He
Appl. Opt. 51(12) 2062-2069 (2012)

Active projection nonlinear γ correction method for fringe projection profilometry

Lin Wang, Yuetong Zhang, Lina Yi, Xin Hao, Meiyi Wang, and Xiangjun Wang
J. Opt. Soc. Am. A 39(11) 1983-1991 (2022)

Three-dimensional shape measurement using a structured light system with dual projectors

Chufan Jiang, Beatrice Lim, and Song Zhang
Appl. Opt. 57(14) 3983-3990 (2018)

Self-correction of projector nonlinearity in phase-shifting fringe projection profilometry

Fuxing Lü, Shuo Xing, and Hongwei Guo
Appl. Opt. 56(25) 7204-7216 (2017)