Recently proposed binary defocusing techniques have led to ultrafast speed 3D shape measurement, but they are generally limited to measurement of a single object at a time. Introducing additional gray coded patterns for point-by-point phase unwrapping could permit simultaneous multiple-object measurement. However, when the objects are moving rapidly, the displacement between the first captured pattern and the last can be significant, and pose challenges related to the precisely designed gray codes. This paper presents a new phase unwrapping strategy that combines the conventional spatial phase unwrapping with the gray code to resolve motion related phase unwrapping problems. A system with a speed of 5,000 Hz was developed to verify the performance of the proposed technique.

© 2011 OSA

1. S. Gorthi and P. Rastogi, “Fringe projection techniques: whither we are?” Opt. Laser. Eng. 48, 133–140 (2010). [CrossRef]
2. S. Zhang, “Recent progresses on real-time 3-D shape measurement using digital fringe projection techniques,” Opt. Laser Eng. 48(2), 149–158 (2010). [CrossRef]
3. S. Lei and S. Zhang, “Flexible 3-D shape measurement using projector defocusing,” Opt. Lett. 34(20), 3080–3082 (2009). [CrossRef] [PubMed]
4. S. Zhang, D. van der Weide, and J. Olvier, “Superfast phase-shifting method for 3-D shape measurement,” Opt. Express 18(9), 9684–9689 (2010). [CrossRef] [PubMed]
5. G. Sansoni, M. Carocci, and R. Rodella, “Three-dimensional vision based on a combination of gray-code and phase-shift light projection: analysis and compensation of the systematic errors,” Appl. Opt. 38(31), 6565–6573 (1999). [CrossRef]
6. S. Zhang, “Flexible 3-D shape measurement using projector defocusing: Extended measurement range,” Opt. Lett. 35(7), 931–933 (2010).
7. J. Pan, P. S. Huang, and F. Chiang, “Color-coded binary fringe projection technique for 3D shape measurement,” Opt. Eng. 44(2), 023606 (2005). [CrossRef]
8. D. Malacara, ed., Optical Shop Testing , 3rd ed. (John Wiley and Sons, 2007). [CrossRef]
9. D. C. Ghiglia and M. D. Pritt, Two-Dimensional Phase Unwrapping: Theory, Algorithms, and Software (John Wiley and Sons, 1998).
10. C. Zhang, P. S. Huang, and F.-P. Chiang, “Microscopic phase-shifting profilometry based on digital micromirror device technology,” Appl. Opt. 41, 5896–5904 (2002). [CrossRef] [PubMed]

Appl. Opt.

• G. Sansoni, M. Carocci, and R. Rodella, “Three-dimensional vision based on a combination of gray-code and phase-shift light projection: analysis and compensation of the systematic errors,” Appl. Opt. 38(31), 6565–6573 (1999). [CrossRef]
• C. Zhang, P. S. Huang, and F.-P. Chiang, “Microscopic phase-shifting profilometry based on digital micromirror device technology,” Appl. Opt. 41, 5896–5904 (2002). [CrossRef] [PubMed]

Opt. Eng.

• J. Pan, P. S. Huang, and F. Chiang, “Color-coded binary fringe projection technique for 3D shape measurement,” Opt. Eng. 44(2), 023606 (2005). [CrossRef]

Opt. Express

• S. Zhang, D. van der Weide, and J. Olvier, “Superfast phase-shifting method for 3-D shape measurement,” Opt. Express 18(9), 9684–9689 (2010). [CrossRef] [PubMed]

Opt. Laser Eng.

• S. Zhang, “Recent progresses on real-time 3-D shape measurement using digital fringe projection techniques,” Opt. Laser Eng. 48(2), 149–158 (2010). [CrossRef]

Opt. Laser. Eng.

• S. Gorthi and P. Rastogi, “Fringe projection techniques: whither we are?” Opt. Laser. Eng. 48, 133–140 (2010). [CrossRef]

Opt. Lett.

• S. Lei and S. Zhang, “Flexible 3-D shape measurement using projector defocusing,” Opt. Lett. 34(20), 3080–3082 (2009). [CrossRef] [PubMed]
• S. Zhang, “Flexible 3-D shape measurement using projector defocusing: Extended measurement range,” Opt. Lett. 35(7), 931–933 (2010).

Other

• D. Malacara, ed., Optical Shop Testing , 3rd ed. (John Wiley and Sons, 2007). [CrossRef]
• D. C. Ghiglia and M. D. Pritt, Two-Dimensional Phase Unwrapping: Theory, Algorithms, and Software (John Wiley and Sons, 1998).

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