title: Generic gamma correction for accuracy enhancement in fringe-projection profilometry.
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.
authors.affiliation: Department of Electrical Engineering, The Catholic University of America, Washington, DC 20064, USA.
authors.forename: Thang
authors.initials: T
authors.lastname: Hoang
authors.forename: Bing
authors.initials: B
authors.lastname: Pan
authors.forename: Dung
authors.initials: D
authors.lastname: Nguyen
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Wang