This paper describes an easy-to-implement three-dimensional (3-D) real-time shape measurement
technique using our newly developed high-speed 3-D vision system. It employs only four
projection fringes to realize full-field phase unwrapping in the presence of discontinuous or
isolated objects. With our self-designed pattern generation hardware and a modified low-cost
DLP projector, the four designed patterns can be generated and projected at a switching speed
of 360 Hz. Using a properly synchronized high-speed camera, the high-speed fringe patterns
distorted by measured objects can be acquired and processed in real-time. The resulting system
can capture and display high-quality textured 3-D data at a speed of 120 frames per second,
with the resolution of 640 × 480 points. The speed can be trebled if a camera with a higher
frame rate is employed. We detail our shape measurement technique, including the four-pattern
decoding algorithm as well as the hardware design. Some evaluation experiments have been
carried out to demonstrate the validity and practicability of the proposed technique.
©2012 Optical Society of America
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