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Proceedings Paper

Remote 3-D laser topographic mapping with dental application
Author(s): Bruce R. Altschuler
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Paper Abstract

In 1979 we first reported progress on a unique 3-D quantitative mapping structured light method to rapidly and remotely interrogate an unknown surface with an array of laser beams and to observe and measure the 3-D surfaces off-axis with one or more videocameras. -''2 Significant progress has occurred recently to make this method practical and cost-effective. The system consists of: 1) at least one passive sensor typically a 512 X 512 square pixel lowlight-level CID image intensified progressive scan videocamera operating at 30 Hz 2) an off-axis active structured laser projector using a 532nm doubled YAG solid state polarized laser beam formers and a prismatic optic to simultaneously generate a 128 X 128 square laser beamlet array 3) a spatially programmable light modulator to block or transmit selected sets of 128 rows (or 128 columns) of laser beams (corresponding to the generated array) at millisecond frame rates 4) optics to project the structured light sets onto the object 5) optics at the sensor end 6) positioning equipment to manipulate the object as required 7) suitable image processors array processors and computers for signal and image processing calculation of tables of X numerical data interactive display and archiving 8)interfaces to other CAD/CAM systems for the replication of surfaces or the reconstruction of multiple surfaces into geometric forms. .

Paper Details

Date Published: 1 April 1991
PDF: 10 pages
Proc. SPIE 1380, Biostereometric Technology and Applications, (1 April 1991); doi: 10.1117/12.48079
Show Author Affiliations
Bruce R. Altschuler, U.S. Army Institute of Dental Research (United States)

Published in SPIE Proceedings Vol. 1380:
Biostereometric Technology and Applications
Robin E. Herron, Editor(s)

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