Instrumentation, Measurement, and Metrology

Trapezoidal phase-shifting method for three-dimensional shape measurement

[+] Author Affiliations
Peisen S. Huang

State University of New York at Stony Brook, Department of Mechanical Engineering, Stony Brook, New York 11794-2300

Song Zhang

State University of New York at Stony Brook, Department of Mechanical Engineering, Stony Brook, New York 11794-2300

Fu-Pen Chiang

State University of New York at Stony Brook, Department of Mechanical Engineering, Stony Brook, New York 11794-2300

Opt. Eng. 44(12), 123601 (January 05, 2006). doi:10.1117/1.2147311
History: Received October 19, 2004; Revised April 14, 2005; Accepted May 02, 2005; Published January 05, 2006
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We propose a novel structured light method, namely a trapezoidal phase-shifting method, for 3-D shape measurement. This method uses three patterns coded with phase-shifted, trapezoidal-shaped gray levels. The 3-D information of the object is extracted by direct calculation of an intensity ratio. Compared to traditional intensity-ratio-based methods, the vertical or depth resolution is six times better. Also, this new method is significantly less sensitive to the defocusing effect of the captured images, which makes large-depth 3-D shape measurement possible. If compared to sinusoidal phase-shifting methods, the resolution is similar, but the data processing speed is at least 4.5 times faster. The feasibility of this method is demonstrated in a previously developed real-time 3-D shape measurement system. The reconstructed 3-D results show similar quality to those obtained by the sinusoidal phase-shifting method. However, since the data processing speed is much faster (4.6ms per frame), both image acquisition and 3-D reconstruction can be done in real time at a frame rate of 40fps and a resolution of 532×500 points. This real-time capability allows us to measure dynamically changing objects, such as human faces. The potential applications of this new method include industrial inspection, reverse engineering, robotic vision, computer graphics, medical diagnosis, etc.

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© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Peisen S. Huang ; Song Zhang and Fu-Pen Chiang
"Trapezoidal phase-shifting method for three-dimensional shape measurement", Opt. Eng. 44(12), 123601 (January 05, 2006). ; http://dx.doi.org/10.1117/1.2147311


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