Optical object identification by means of a joint-transform phase-only correlator using a Bi12SiO20 crystal in the Fourier domain

Colin M. Cartwright; Santiago Vallmitjana; N. J. Cook; Arturo Carnicer; W. Allan Gillespie; Ignacio Prades Juvells

doi:10.1117/12.281301

19 August 1997 Optical object identification by means of a joint-transform phase-only correlator using a Bi12SiO20 crystal in the Fourier domain

Colin M. Cartwright, Santiago Vallmitjana, N. J. Cook, Arturo Carnicer, W. Allan Gillespie, Ignacio Prades Juvells

Author Affiliations +

Proceedings Volume 3101, New Image Processing Techniques and Applications: Algorithms, Methods, and Components II; (1997) https://doi.org/10.1117/12.281301
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

The use of photorefractive materials such as Bi₁₂SiO₂₀ as a dynamic holographic medium is becoming an interesting alternative to current liquid crystal based modulators in real-time optical image processing. In this paper 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 deal with two possible ways to register the Fourier plane information: direct detection of the joint power spectrum or obtaining the spectrum from the phase-only distribution of the joint input. We also compare the latter case with the performance of a binary joint transform correlator. Analysis, simulations and experimental results are presented.

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Colin M. Cartwright, Santiago Vallmitjana, N. J. Cook, Arturo Carnicer, W. Allan Gillespie, and Ignacio Prades Juvells "Optical object identification by means of a joint-transform phase-only correlator using a Bi12SiO20 crystal in the Fourier domain", Proc. SPIE 3101, New Image Processing Techniques and Applications: Algorithms, Methods, and Components II, (19 August 1997); https://doi.org/10.1117/12.281301

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KEYWORDS

Optical correlators

Crystals

Joint transforms

Fourier transforms

Liquid crystals

Binary data

Laser crystals

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