An embedded three-dimensional profilometry based on a combination of gray-code and phase shifting method

Dong Li; Jindong Tian

doi:10.1117/12.869981

9 November 2010 An embedded three-dimensional profilometry based on a combination of gray-code and phase shifting method

Dong Li, Jindong Tian

Author Affiliations +

Proceedings Volume 7850, Optoelectronic Imaging and Multimedia Technology; 78500M (2010) https://doi.org/10.1117/12.869981
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

An embedded three-dimensional (3-D) profilometry system based on a combination of gray-code and phase shifting (GCPS) method is proposed. This system consists of a digital-micromirror-device (DMD) based video projector, a high-speed CCD camera and an embedded digital signal processing hardware system based on DSP. In this technique, seven gray-code patterns and three sinusoidal fringe patterns with 120-deg phase shift are integrated in red, green and blue channels to form four color fringe patterns. When the four color fringe patterns are sent to the DMD based projector without color filter, the previous gray-code patterns and three sinusoidal fringe patterns are repeatedly projected to an object surface in gray-scale sequentially. These fringe patterns deformed by the object surface are captured by a high-speed CCD camera synchronized with the projector. An embedded hardware system is developed for synchronization between the camera and the projector and taking full advantage of DSP parallel processing capability for real-time phase retrieve and 3-D reconstruction. Since the number of projected images of GCPS is reduced from 11 to 4, the measurement speed is enhanced dramatically. Experimental results demonstrated the feasibility of the proposed technique for high-speed 3-D shape measurement.

Citation Download Citation

Dong Li and Jindong Tian "An embedded three-dimensional profilometry based on a combination of gray-code and phase shifting method", Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78500M (9 November 2010); https://doi.org/10.1117/12.869981

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