Experimental demonstration of a chirp-modulated joint transfrom correlator using separate input SLMs

Thomas J. Grycewicz; Bahram Javidi

doi:10.1117/12.217646

28 August 1995 Experimental demonstration of a chirp-modulated joint transfrom correlator using separate input SLMs

Thomas J. Grycewicz, Bahram Javidi

Proceedings Volume 2565, Optical Implementation of Information Processing; (1995) https://doi.org/10.1117/12.217646
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The chirp encoded joint transform correlator (JTC) with separate input planes has been demonstrated in two experiments using Michaelson and Mach-Zehnder interferometers to combine the inputs. In the first, the Fourier plane modulation characteristics of the chirp- encoded JTC was investigated by correlating two pinholes. The peak-to-noise ratio performance in this experiment was 26 dB. In the second, chirp modulation was applied to correlating one fingerprint against a set of four fingerprints. Binary ferroelectric SLMs were used as inputs and for display in the Fourier plane. A discrimination ratio of 8.1 dB was demonstrated for the chirp modulated JTC. This is a 2.3 dB improvement over the discrimination observed using the same equipment in a binary JTC arrangement.

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Thomas J. Grycewicz and Bahram Javidi "Experimental demonstration of a chirp-modulated joint transfrom correlator using separate input SLMs", Proc. SPIE 2565, Optical Implementation of Information Processing, (28 August 1995); https://doi.org/10.1117/12.217646

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KEYWORDS

Spatial light modulators

Modulation

Binary data

Optical correlators

Joint transforms

Cameras

Computer programming

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