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Proceedings Paper

Joint transform correlator using a 4-f lens system to achieve virtual displacement along the optical axis
Author(s): Thomas J. Grycewicz; Joseph L. Horner
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Paper Abstract

The performance of the optical joint transform correlator is severely degraded when multiple targets or multiple identical nontarget images in the input plane produce false peaks in the output plane. One method for overcoming this is to displace the input and or reference plane along the optical axis. This results in the true correlation peaks coming to a focus in an output plane separate from the plane where the false peaks come into focus. These planes are also separated by displacement along the optical axis. We show that this separation can be achieved by placing a simple lens system along one side of the optical path in the input side of a conventional joint transform correlator. By appropriate lens choice, any virtual displacement can be achieved. Through use of computer simulation, we show the effects of varying the virtual input displacement.

Paper Details

Date Published: 25 October 1993
PDF: 9 pages
Proc. SPIE 1959, Optical Pattern Recognition IV, (25 October 1993); doi: 10.1117/12.160307
Show Author Affiliations
Thomas J. Grycewicz, Rome Lab. (United States)
Joseph L. Horner, Rome Lab. (United States)

Published in SPIE Proceedings Vol. 1959:
Optical Pattern Recognition IV
David P. Casasent, Editor(s)

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