S. Zhang, "Flexible 3-D shape measurement using projector defocusing: extended measurement range," Opt. Lett. 35(7), 931-933, 2010 (Cover Feature); doi: 10.1364/OL.35.000934
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 also proposed to tackle the problems related to the defocusing.