Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector
A structured light system using a digital video projector is widely used for 3D shape measurement. However, the nonlinear {gamma} of the projector causes the projected fringe patterns to be nonsinusoidal, which results in phase error and therefore measurement error. It has been shown that, by using a small look-up table (LUT), this type of phase error can be reduced significantly for a three-step phase-shifting algorithm. We prove that this algorithm is generic for any phase-shifting algorithm. Moreover, we propose a new LUT generation method by analyzing the captured fringe image of a flat board directly. Experiments show that this error compensation algorithm can reduce the phase error to at least 13 times smaller.
- OSTI ID:
- 20854004
- Journal Information:
- Applied Optics, Vol. 46, Issue 1; Other Information: DOI: 10.1364/AO.46.000036; (c) 2007 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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