Hybrid pattern recognition system

Thomas Harrer; Azad Siahmakoun

doi:10.1117/12.140952

2 September 1992 Hybrid pattern recognition system

Thomas Harrer, Azad Siahmakoun

Proceedings Volume 1779, Optical Design and Processing Technologies and Applications; (1992) https://doi.org/10.1117/12.140952
Event: Optical Engineering Midwest 1992, 1992, Chicago, IL, United States

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.

Citation Download Citation

Thomas Harrer and Azad Siahmakoun "Hybrid pattern recognition system", Proc. SPIE 1779, Optical Design and Processing Technologies and Applications, (2 September 1992); https://doi.org/10.1117/12.140952

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