Absolute measurement using field-shifted moire

Leonard H. Bieman; Kevin G. Harding; Albert J. Boehnlein

doi:10.1117/12.57986

1 March 1992 Absolute measurement using field-shifted moiré

Leonard H. Bieman, Kevin G. Harding, Albert J. Boehnlein

Proceedings Volume 1614, Optics, Illumination, and Image Sensing for Machine Vision VI; (1992) https://doi.org/10.1117/12.57986
Event: Robotics '91, 1991, Boston, MA, United States

Abstract

Phase shifted moire interferometry is one of the most effective tools for obtaining a full-field depth map. The major draw back of the technique is the two pi ambiguity which limits the measurement depth range to one fringe or requires the counting of fringes across the image. In either case, only a relative measurement is obtained, no information is available about the absolute distance to the camera. By moving the moire projection system (field shifting) the period of the moire pattern is changed allowing extraction of absolute depth information. We have built an instrument, employing field shifted moire to produce a full field depth map with 12 bits of depth resolution. The performance and applications of this instrument are discussed.

Citation Download Citation

Leonard H. Bieman, Kevin G. Harding, and Albert J. Boehnlein "Absolute measurement using field-shifted moiré", Proc. SPIE 1614, Optics, Illumination, and Image Sensing for Machine Vision VI, (1 March 1992); https://doi.org/10.1117/12.57986

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