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2 August 2010 Improving 4-D shape measurement by using projector defocusing
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This paper presents a real-time 3-D, or 4-D, shape measurement technique that can reach the speed limit of a digital fringe projection system without significantly increasing the system cost. Instead of generating sinusoidal fringe patterns by a computer directly, they are produced by defocusing binary structured patterns. By this means, with a relatively inexpensive camera, the 3-D shape measurement system can double the previously maximum achievable speed, and reaches the refreshing rate of a digital-light-processing (DLP) projector: 120 Hz.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yuanzheng Gong and Song Zhang "Improving 4-D shape measurement by using projector defocusing", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 77901A (2 August 2010);

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