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    Spread-space spread-spectrum technique for secure multiplexing

    Hennelly, Bryan M. and Naughton, Thomas J. and McDonald, John and Sheridan, J. T. and Unnikrishnan, G. and Kelly, D.P. and Javidi, B. (2007) Spread-space spread-spectrum technique for secure multiplexing. Optics Letters, 32 (9). pp. 1060-1062. ISSN 0146-9592

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    A novel technique for multiplexing complex images is proposed in which each image may be demultiplexed only if a set of random encryption keys is known. The technique utilizes the ability of the double random phase encoding method to spread a signals’ energy in both the space and the spatial frequency domains in a controlled manner. To multiplex, images are independently encrypted with different phase keys and then superimposed by recording sequentially on the same material. Each image is extracted by using the particular key associated with it. During decryption the energy from the other images is further spread, making it possible to minimize its effects by using suitable filters. Wigner analysis is applied to the technique, and numerical results are presented.

    Item Type: Article
    Additional Information: Postprint version of original article. The definitive version of this article is available at © 2007 Optical Society of America. We acknowledge the support of the Irish Research Council for Science Engineering and Technology.
    Keywords: Signal processing; Multiplex holography; Fourier optics;
    Academic Unit: Faculty of Science and Engineering > Computer Science
    Faculty of Science and Engineering > Electronic Engineering
    Item ID: 5791
    Depositing User: Dr. Bryan Hennelly
    Date Deposited: 09 Feb 2015 16:55
    Journal or Publication Title: Optics Letters
    Publisher: Optical Society of America
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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