1 February 2011 High-resolution, high-speed three-dimensional shape measurement using projector defocusing
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Optical Engineering, 50(2), 023603 (2011). doi:10.1117/1.3534798
We present a high-resolution, high-speed three-dimensional (3-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 ones. By this means, with a relatively inexpensive camera, the 3-D shape measurement system can double the previously maximum achievable speed and reach the refreshing rate of a digital-light-processing projector: 120 Hz.
Yuanzheng Gong, Song Zhang, "High-resolution, high-speed three-dimensional shape measurement using projector defocusing," Optical Engineering 50(2), 023603 (1 February 2011). https://doi.org/10.1117/1.3534798

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