Joint transform correlator using a 4-f lens system to achieve virtual displacement along the optical axis

Thomas J. Grycewicz; Joseph L. Horner

doi:10.1117/12.160307

25 October 1993 Joint transform correlator using a 4-f lens system to achieve virtual displacement along the optical axis

Thomas J. Grycewicz, Joseph L. Horner

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Proceedings Volume 1959, Optical Pattern Recognition IV; (1993) https://doi.org/10.1117/12.160307
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

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.

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Thomas J. Grycewicz and Joseph L. Horner "Joint transform correlator using a 4-f lens system to achieve virtual displacement along the optical axis", Proc. SPIE 1959, Optical Pattern Recognition IV, (25 October 1993); https://doi.org/10.1117/12.160307

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KEYWORDS

Optical correlators

Joint transforms

Signal detection

Fourier transforms

Optical pattern recognition

Spatial light modulators

Computer simulations

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