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    Phase in Optical Image Processing

    Naughton, Thomas J. (2010) Phase in Optical Image Processing. In: International Conference on Advanced Phase Measurement Methods in Optics and Imaging, Monte Verità, Ascona, Switzerland, 16-21 May 2010. American Institute of Physics, Melville, N.Y. , pp. 235-240. ISBN 9780735407831

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    The use of phase has a long standing history in optical image processing, with early milestones being in the field of pattern recognition, such as VanderLugt's practical construction technique for matched filters, and (implicitly) Goodman's joint Fourier transform correlator. In recent years, the flexibility afforded by phase-only spatial light modulators and digital holography, for example, has enabled many processing techniques based on the explicit encoding and decoding of phase. One application area concerns efficient numerical computations. Pushing phase measurement to its physical limits, designs employing the physical properties of phase have ranged from the sensible to the wonderful, in some cases making computationally easy problems easier to solve and in other cases addressing mathematics' most challenging computationally hard problems. Another application area is optical image encryption, in which, typically, a phase mask modulates the fractional Fourier transformed coefficients of a perturbed input image, and the phase of the inverse transform is then sensed as the encrypted image. The inherent linearity that makes the system so elegant mitigates against its use as an effective encryption technique, but we show how a combination of optical and digital techniques can restore confidence in that security. We conclude with the concept of digital hologram image processing, and applications of same that are uniquely suited to optical implementation, where the processing, recognition, or encryption step operates on full field information, such as that emanating from a coherently illuminated real-world three-dimensional object.

    Item Type: Book Section
    Additional Information: Some ideas in this manuscript have benefitted from discussions with Damien Woods. The research leading to these results has received funding from Science Foundation Ireland under the National Development Plan, and the European Community’s Seventh Framework Programme FP7/2007-2013 under grant agreement no. 216105 (Real 3D).
    Keywords: Optical image processing; optical processing; optical modulators; digital holography;
    Academic Unit: Faculty of Science and Engineering > Computer Science
    Item ID: 2445
    Depositing User: Thomas Naughton
    Date Deposited: 16 Feb 2011 17:01
    Publisher: American Institute of Physics
    Refereed: Yes
    Funders: Science Foundation Ireland, European Community’s Seventh Framework Programme FP7/2007-2013
    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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