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Proceedings Paper

Hybrid pattern recognition system
Author(s): Thomas Harrer; Azad Siahmakoun
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Paper Abstract

A closed loop digital/optical pattern recognition system is presented, using a photorefractive correlator. A personal computer is used to control an optical cross-correlator, consisting of a 4f-Fourier processor with a BaTiO3 crystal in its Fourier plane. A test pattern is inserted into the optical system, via a modified liquid crystal television. The test pattern is stored in the photorefractive crystal, using a two-wave mixing technique. Several master patterns are compared to the test pattern using the optical cross-correlation technique. The output signal of the optical cross-correlator is detected by a CCD camera, and is transferred to the PC for evaluation. The spatial resolution of the optical system is examined both theoretically and experimentally.

Paper Details

Date Published: 2 September 1992
PDF: 8 pages
Proc. SPIE 1779, Optical Design and Processing Technologies and Applications, (2 September 1992); doi: 10.1117/12.140952
Show Author Affiliations
Thomas Harrer, Rose-Hulman Institute of Technology (United States)
Azad Siahmakoun, Rose-Hulman Institute of Technology (United States)

Published in SPIE Proceedings Vol. 1779:
Optical Design and Processing Technologies and Applications
Robert J. Heaston, Editor(s)

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