Implementation of a photorefractive binary joint transform correlator

Nick J. Cook, A. Carnicer, S. Vallmitjana, I. Juvells, Colin M. Cartwright, W. Allan Gillespie

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)1977-1984
Number of pages8
JournalJournal of the Optical Society of America B: Optical Physics
Volume15
Issue number7
DOIs
StatePublished - 1998

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correlators
liquid crystals
preprocessing
pattern recognition
image processing
power spectra
modulators
recording
crystals
simulation

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Cook, N. J., Carnicer, A., Vallmitjana, S., Juvells, I., Cartwright, C. M., & Gillespie, W. A. (1998). Implementation of a photorefractive binary joint transform correlator. Journal of the Optical Society of America B: Optical Physics, 15(7), 1977-1984. DOI: doi:10.1364/JOSAB.15.001977

Cook, Nick J.; Carnicer, A.; Vallmitjana, S.; Juvells, I.; Cartwright, Colin M.; Gillespie, W. Allan / Implementation of a photorefractive binary joint transform correlator.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 15, No. 7, 1998, p. 1977-1984.

Research output: Contribution to journalArticle

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Cook, NJ, Carnicer, A, Vallmitjana, S, Juvells, I, Cartwright, CM & Gillespie, WA 1998, 'Implementation of a photorefractive binary joint transform correlator' Journal of the Optical Society of America B: Optical Physics, vol 15, no. 7, pp. 1977-1984. DOI: doi:10.1364/JOSAB.15.001977

Implementation of a photorefractive binary joint transform correlator. / Cook, Nick J.; Carnicer, A.; Vallmitjana, S.; Juvells, I.; Cartwright, Colin M.; Gillespie, W. Allan.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 15, No. 7, 1998, p. 1977-1984.

Research output: Contribution to journalArticle

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AU - Gillespie,W. Allan

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AB - 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.

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Cook NJ, Carnicer A, Vallmitjana S, Juvells I, Cartwright CM, Gillespie WA. Implementation of a photorefractive binary joint transform correlator. Journal of the Optical Society of America B: Optical Physics. 1998;15(7):1977-1984. Available from, DOI: doi:10.1364/JOSAB.15.001977