Abstract

Fringe-projection profilometry is one of the most commonly used noncontact methods for acquiring the three- dimensional (3D) shape information of objects. In practice, the luminance nonlinearity caused by the gamma effect of a digital projector and a digital camera yields undesired fringe intensity changes, which substantially reduce the measurement accuracy. In this Letter, we present a robust and simple scheme to eliminate the intensity nonlinearity induced by the gamma effect by combining a universal phase-shifting algorithm with a gamma correction method. First, by using three-step and large-step phase-shifting techniques, the gamma value involved in the measurement system can be detected. Then, a gamma pre-encoding process is applied to the system for actual 3D shape measurements. With the proposed technique, high accuracy of measurement can be achieved with the conventional small-step phase-shifting algorithm. The validity of the technique is verified by experiments.

© 2010 Optical Society of America

Gamma correction for digital fringe projection profilometry

Hongwei Guo, Haitao He, and Mingyi Chen
Appl. Opt. 43(14) 2906-2914 (2004)

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)

Gamma-distorted fringe image modeling and accurate gamma correction for fast phase measuring profilometry

Zhongwei Li and Youfu Li
Opt. Lett. 36(2) 154-156 (2011)

Mask information-based gamma correction in fringe projection profilometry

Huixin Song and Lingbao Kong
Opt. Express 31(12) 19478-19490 (2023)

Least-squares gamma estimation in fringe projection profilometry

Antonio Muñoz, Jorge L. Flores, Geliztle Parra-Escamilla, Luis A. Morales, Sotero Ordones, and Manuel Servin
Appl. Opt. 60(5) 1137-1142 (2021)