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

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

This paper analyzes the phase error for a three-dimensional (3D) shape measurement system that utilizes our recently proposed projector defocusing technique. This technique generates seemingly sinusoidal structured patterns by defocusing binary structured patterns and then uses these patterns to perform 3D shape measurement by fringe analysis. However, significant errors may still exist if an o...

Uniaxial three-dimensional shape measurement with projector defocusing

Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector.

A structured light system using a digital video projector is widely used for 3D shape measurement. However, the nonlinear gamma 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...

High-resolution, high-speed three-dimensional shape measurement using projector defocusing

Yuanzheng Gong Song Zhang Iowa State University Department of Mechanical Engineering Ames, Iowa 50011 E-mail: [email protected] Abstract. We present a high-resolution, high-speed three-dimensional (3-D) shape measurement technique that can reach the speed limit of a digital fringe projection system without significantly increasing the system cost. Instead of generating sinusoidal fringe patterns...

Flexible 3D shape measurement using projector defocusing: extended measurement range.

A recently proposed flexible 3D shape measurement technique using a defocused projector [Opt. Lett. 34, 3080 (2009)] shows great potential because of its elimination of projector's gamma calibration. However, it cannot handle step-height surfaces. I present here a technique to extend its measurement range to an arbitrary shape by integrating a binary coding method. A computational framework is ...