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Proceedings Paper

Moving-correlation-code triangulation range imaging
Author(s): Frank Pipitone; Ralph L. Hartley
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Paper Abstract

A new method is described for obtaining accurate range images at high sped in a low-cost instrument. A prototype has been built and tested, and a patent application submitted. The method resembles grid-coding in that a camera and a stripe projector are directed at a scene, but the projector is different. It consists of a thin light source on the axis of a turntable, and a binary mask conforming to a cylinder coaxial with this. The mask has alternate black and clear stripes parallel to the axis. It forms a DeBruijn sequence, i.e., a sequence in which all possible sub- sequences of given length occur. No lens is used, deliberately smoothing the resulting illumination. In operation, the turntable rotates, and six consecutive images are taken at uniform intervals. A given pixel records six consecutive samples of a scene point. This six-vector, when normalized to unity to accommodate reflectance variations, is unique to the place in the sequence form which it came. Thus we can compute the position in 3-space of the surface point at which the pixel is looking. Observed accuracy is .1 millimeter at 30 centimeters range.

Paper Details

Date Published: 2 January 1998
PDF: 7 pages
Proc. SPIE 3201, Sensors and Controls for Advanced Manufacturing, (2 January 1998); doi: 10.1117/12.298006
Show Author Affiliations
Frank Pipitone, Naval Research Lab. (United States)
Ralph L. Hartley, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 3201:
Sensors and Controls for Advanced Manufacturing
Bartholomew O. Nnaji; Anbo Wang, Editor(s)

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