CUED Publications database

Holographic memory with correlator based readout

Duelli, M and Pourzand, AR and Collings, N and Dändliker, R (1998) Holographic memory with correlator based readout. IEEE Journal on Selected Topics in Quantum Electronics, 4. pp. 849-855. ISSN 1077-260X

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Abstract

The investigation of an inverted hybrid digital/ optical VanderLugt type correlator based on a holographic memory is reported in this paper. A set of reference templates is stored in a photorefractive crystal (PRC) by angular hologram multiplexing. In the filter plane, a phase-modulating liquid crystal television (LCTV) serves as a phase-only input device. During the recognition process, which is based on the pure phase correlation, the reference templates are correlated sequentially with the input object. This correlator shows high sensitivity to object rotation, sharp correlation peaks, high light efficiency, and is fully shift-invariant in spite of the PRC thickness. The influences of the LCTV on the performance of the system are discussed and experimental results are shown.

Item Type: Article
Uncontrolled Keywords: Holographic memory Pattern recognition Pure phase correlation
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:02
Last Modified: 27 Nov 2014 04:53
DOI: 10.1109/2944.735771