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19 August 1997 Optical object identification by means of a joint-transform phase-only correlator using a Bi12SiO20 crystal in the Fourier domain
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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