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Proceedings Paper

Optical object identification by means of a joint-transform phase-only correlator using a Bi12SiO20 crystal in the Fourier domain
Author(s): Colin M. Cartwright; Santiago Vallmitjana; N. J. Cook; Arturo Carnicer; W. Allan Gillespie; Ignacio Prades Juvells
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Paper 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.

Paper Details

Date Published: 19 August 1997
PDF: 10 pages
Proc. SPIE 3101, New Image Processing Techniques and Applications: Algorithms, Methods, and Components II, (19 August 1997); doi: 10.1117/12.281301
Show Author Affiliations
Colin M. Cartwright, Univ. of Abertay Dundee (United Kingdom)
Santiago Vallmitjana, Univ. de Barcelona (Spain)
N. J. Cook, Univ. of Abertay Dundee (United Kingdom)
Arturo Carnicer, Univ. de Barcelona (Spain)
W. Allan Gillespie, Univ. of Abertay Dundee (United Kingdom)
Ignacio Prades Juvells, Univ. de Barcelona (Spain)


Published in SPIE Proceedings Vol. 3101:
New Image Processing Techniques and Applications: Algorithms, Methods, and Components II
Philippe Refregier; Rolf-Juergen Ahlers, Editor(s)

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