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Proceedings Paper

Multispot projection, tracking, and calibration
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Paper Abstract

A Phase-only spatial light modulator can provide active spot pattern projection with high signal-to-noise ratio and form near-arbitrary phase modulation surfaces. As a result they can diffract laser beams into a near-arbitrary pattern of laser spots. Depending on the sequence of phase images loaded onto the SLM, the spots can be scanned on independent and continuous two-dimensional trajectories. We refer to this flexible beamsteering system as the real-time adaptive multi-spot laser beamsteering system (RAMS-LBS). This paper presents work under progress, in developing 2D and 3D calibration algorithms for a spot pattern projection system. In the 2D calibration process, spot grids are projected with successively more spot locations. After each projection, a higher order model is determined for camera to projector coordinate transforms. The accuracies of different model orders are measured. In the 3D calibration process, grids of spots are projected onto non-coplanar target grid to construct the transformation matrix between different coordinates. Perspective distortions are included in the transformation vectors after the calibration. Therefore, 3D information of the target can be obtained in the calibrated system. Applications such as 3D target surface topology measurement and target detection using 2D and 3D information are described in this paper.

Paper Details

Date Published: 6 August 2003
PDF: 12 pages
Proc. SPIE 5106, Optical Pattern Recognition XIV, (6 August 2003); doi: 10.1117/12.487442
Show Author Affiliations
Veera Ganesh Yalla, Univ. of Kentucky (United States)
Wei Su, Univ. of Kentucky (United States)
Laurence G. Hassebrook, Univ. of Kentucky (United States)

Published in SPIE Proceedings Vol. 5106:
Optical Pattern Recognition XIV
David P. Casasent; Tien-Hsin Chao, Editor(s)

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