Experimental implementation of a photorefractive joint transform correlator with circular harmonic filters

Hui Zhang, Colin M. Cartwright, Mei-Song Ding, Zhao-Qi Wang, Nick J. Cook, W. Allan Gillespie

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    1 Citation (Scopus)

    Abstract

    We present an experimental realization of optical correlation for real-time rotational-invariance pattern recognition by means of a photorefractive joint transform correlator. Single and multiple circular harmonic components have been used to form correlation filters. The correlator operates with a liquid crystal television as the input images and a photorefractive crystal Bi12SiO20 (BSO) as the recording medium. Suitable pre-processing of the references at the object plane makes up for the lack of light transmission. The properties of circular harmonic phase-only filter and circular harmonic matched filter have been compared. Also the noise robustness of these filters has been tested by tracking an object against a non-overlapping noise background. Analysis and experimental results are presented.
    Original languageEnglish
    Pages (from-to)129-136
    Number of pages8
    JournalOptics Communications
    Volume173
    Issue number1-6
    DOIs
    Publication statusPublished - Jan 2000

    Keywords

    • Spatial filter
    • Joint power spectrum
    • BSO
    • Harmonic expansion

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