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...

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Bibliographic Details
Published inApplied optics (2004) Vol. 46; no. 1; p. 36
Main Authors Zhang, Song, Yau, Shing-Tung
Format Journal Article
LanguageEnglish
Published United States 01.01.2007
Online AccessGet more information
ISSN1559-128X
DOI10.1364/ao.46.000036

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Summary: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.
ISSN:1559-128X
DOI:10.1364/ao.46.000036