Dual-frequency pattern scheme for high-speed 3-D shape measurement

Kai Liu, Yongchang Wang, Daniel L. Lau, Qi Hao, Laurence G. Hassebrook

Research output: Contribution to journalArticlepeer-review

324 Scopus citations


A novel dual-frequency pattern is developed which combines a high-frequency sinusoid component with a unit-frequency sinusoid component, where the high-frequency component is used to generate robust phase information, and the unit-frequency component is used to reduce phase unwrapping ambiguities. With our proposed pattern scheme, phase unwrapping can overcome the major shortcomings of conventional spatial phase unwrapping: phase jumping and discontinuities. Compared with conventional temporal phase unwrapped approaches, the proposed pattern scheme can achieve higher quality phase data using a less number of patterns. To process data in real time, we also propose and develop look-up table based fast and accurate algorithms for phase generation and 3-D reconstruction. Those fast algorithms can be applied to our pattern scheme as well as traditional phase measuring profllometry. For a 640 × 480 video stream, we can generate phase data at 1063.8 frames per second and full 3-D coordinate point clouds at 228.3 frames per second. These achievements are 25 and 10 times faster than previously reported studies.

Original languageEnglish
Pages (from-to)5229-5244
Number of pages16
JournalOptics Express
Issue number5
StatePublished - Mar 1 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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