Digital fringe projection technique for high-speed 3D shape measurement

Peisen S. Huang; Chengping Zhang; Fu-Pen Chiang

doi:10.1117/12.403861

10 October 2000 Digital fringe projection technique for high-speed 3D shape measurement

Peisen S. Huang, Chengping Zhang, Fu-Pen Chiang

Proceedings Volume 4222, Process Control and Inspection for Industry; (2000) https://doi.org/10.1117/12.403861
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

Abstract

A high-speed phase-shifting technique for 3D shape measurement has been developed and experimented. A Digital Micromirror Device (DMD) based video projector is used to project sinusoidal fringe patterns onto the object surface. Its red, green and blue (RGB) channels are programmed to be sinusoidal fringe patterns with 120-degree phase difference. The projector has a color filter with four segments, RGB and clear, which controls the color of the projected image. When a specific segment is in the light path, the DMD forms the corresponding image of that color. A 24-bit color image is formed when the RGB color channels are sequentially projected in a cycle time of 10 ms. When the color filter in the projector is removed, the DMD still projects the three color channels sequentially, but the actual projected images are now in grayscale. The timing control mechanism of the DMD is studied and a circuit is designed to provide an external timing signal for projection control. When a CCD camera used to capture the fringe patterns is synchronized with the DMD, the individual channels of RGB or the three phase-shifted fringe patterns can be captured in less than 10mn, thus making high- speed phase shifting possible. Experimental results demonstrated the feasibility of this technique for high-speed 3D shape measurement.

Citation Download Citation

Peisen S. Huang, Chengping Zhang, and Fu-Pen Chiang "Digital fringe projection technique for high-speed 3D shape measurement", Proc. SPIE 4222, Process Control and Inspection for Industry, (10 October 2000); https://doi.org/10.1117/12.403861

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