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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 7 — Jul. 1, 1998
  • pp: 1977–1984

Implementation of a photorefractive binary joint transform correlator

N. J. Cook, A. Carnicer, S. Vallmitjana, I. Juvells, C. M. Cartwright, and W. A. Gillespie  »View Author Affiliations


JOSA B, Vol. 15, Issue 7, pp. 1977-1984 (1998)
http://dx.doi.org/10.1364/JOSAB.15.001977


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Abstract

The use of photorefractive materials such as Bi 12 SiO 20 as dynamic holographic media is becoming an interesting alternative to that of the current liquid-crystal-based modulators in real-time optical image processing. We present an experimental realization of optical correlation for pattern recognition by means of a photorefractive joint transform correlator. The correlator operates with a liquid-crystal television as the input and a photorefractive crystal at the recording plane. We consider two possible ways of registering the Fourier plane information: conventional detection of the joint power spectrum, and utilization of only phase information at the Fourier plane by suitable preprocessing of the scene and the reference at the object plane. We compare the latter case with the performance of a binary joint transform correlator. Analysis, simulations, and experimental results are presented. 1998 Optical Society of America S0740-3224(98)01007-8

[Optical Society of America ]

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.4550) Fourier optics and signal processing : Correlators
(070.5010) Fourier optics and signal processing : Pattern recognition
(100.1390) Image processing : Binary phase-only filters
(160.5320) Materials : Photorefractive materials

Citation
N. J. Cook, A. Carnicer, S. Vallmitjana, I. Juvells, C. M. Cartwright, and W. A. Gillespie, "Implementation of a photorefractive binary joint transform correlator," J. Opt. Soc. Am. B 15, 1977-1984 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-7-1977

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