Triple joint transform correlator

Hui Zhang, Colin M. Cartwright, Meisong Ding, G. A. Gillespie

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    The joint transform correlator (JTC) is a robust architecture for optical object recognition or verification and has been investigated intensively for a number of years. In order to improve its performance digital processing, such as binarization to an appropriate threshold, has been proposed at the recording stage of the joint power spectrum (JPS), this of course to some extent negates the benefits of an optical system. We propose to employ a third beam which is coherent to the beams forming the JPS and is the Fourier transform of an appropriate third input image and thus can be used to modify the JPS so as to implement a phase only filtering action for example. The triple joint transform correlator thus consists of three Fourier spectra incident simultaneously on a photorefractive crystal and can exhibit improved discrimination over the conventional JTC without an intermediate digital processing stage. Computer simulations and experimental results are presented.
    Original languageEnglish
    Title of host publicationSPIE proceedings
    Subtitle of host publicationOptical pattern recognition X
    EditorsDavid P. Casasent, Tien-Hsin Chao
    Place of PublicationOrlando, FL
    Number of pages12
    Publication statusPublished - 9 Mar 1999
    EventSPIE's 13th Annual International Symposium on Aerospace/Defense Sensing,Simulation and Controls - Orlando, United States
    Duration: 5 Apr 19999 Apr 1999
    Conference number: 13

    Publication series

    NameSPIE Proceedings


    ConferenceSPIE's 13th Annual International Symposium on Aerospace/Defense Sensing,Simulation and Controls
    Country/TerritoryUnited States


    • Joint transform correlator
    • Optical object recognition
    • Digital signal processing
    • Fourier transforms
    • Computer simulations
    • Crystals
    • Optical systems


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