Optimized dithering technique for three-dimensional shape measurement with projector defocusing

Uniaxial 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...

High quality three-dimensional (3D) shape measurement using intensity-optimized dithering technique

In past decades, there has been an upsurge in the development of three-dimensional (3D) shape measurement and its applications. Over the years, there are a variety of technologies developed including laser scanning, stereo vision, and structured light. Among these technologies, the structured-light technique has the advantages of fast computation speeds and high measurement resolution. Therefor...

Phase-optimized dithering technique for high-quality 3D shape measurement

Our recent study showed that the Bayer-dithering technique could substantially improve 3D measurement quality for the binary defocusing method. Yet, the dithering technique was developed to optimize the appearance or intensity representation, rather than the phase, of an image. This paper presents a framework to optimize the Bayer-dithering technique in phase domain by iteratively mutating the ...

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...