Instrumentation, Techniques, and Measurement

High-speed high-accuracy three-dimensional shape measurement using digital binary defocusing method versus sinusoidal method

[+] Author Affiliations
Jae-Sang Hyun, Beiwen Li, Song Zhang

Purdue University, School of Mechanical Engineering, West Lafayette, Indiana, United States

Opt. Eng. 56(7), 074102 (Jul 06, 2017). doi:10.1117/1.OE.56.7.074102
History: Received February 3, 2017; Accepted June 15, 2017
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Abstract.  This paper presents our research findings on high-speed high-accuracy three-dimensional shape measurement using digital light processing (DLP) technologies. In particular, we compare two different sinusoidal fringe generation techniques using the DLP projection devices: direct projection of computer-generated 8-bit sinusoidal patterns (a.k.a., the sinusoidal method), and the creation of sinusoidal patterns by defocusing binary patterns (a.k.a., the binary defocusing method). This paper mainly examines their performance on high-accuracy measurement applications under precisely controlled settings. Two different projection systems were tested in this study: a commercially available inexpensive projector and the DLP development kit. Experimental results demonstrated that the binary defocusing method always outperforms the sinusoidal method if a sufficient number of phase-shifted fringe patterns can be used.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Jae-Sang Hyun ; Beiwen Li and Song Zhang
"High-speed high-accuracy three-dimensional shape measurement using digital binary defocusing method versus sinusoidal method", Opt. Eng. 56(7), 074102 (Jul 06, 2017). ; http://dx.doi.org/10.1117/1.OE.56.7.074102


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