Summary form only given. A nonlinear joint transform correlator (JTC) architecture can be used to verify the authenticity of the card. The complex mask and an image of a corresponding reference phase mask are illuminated by coherent light in the input plane of a JTC. The interference between the Fourier transforms of the two input images is produced by a lens and is square-law detected to obtain the joint power spectrum which is inverse Fourier transformed to produce the correlation between the input mask and the reference mask.


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    Title :

    Optical signal processor for anti-counterfeiting and security systems


    Contributors:
    Horner, J.L. (author) / Javidi, B. (author)

    Published in:

    Proceedings of LEOS'94 ; 1 ; 145-146 vol.1


    Publication date :

    1994-01-01


    Size :

    208674 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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