Computer Generated Complex Filter for an All Optical and a Digital Optical Hybrid Correlator

Birch, Philip, Young, Rupert, Claret-Tournier, Frederic, Budgett, David and Chatwin, Christopher (2002) Computer Generated Complex Filter for an All Optical and a Digital Optical Hybrid Correlator. Optical Engineering, 41 (105). pp. 105-111. ISSN 0091-3286

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We present results of a correlation filter utilizing a computer-generated hologram using an analog ferroelectric liquid-crystal spatial light modulator (SLM). The SLM amplitude-modulates light and can induce a 0-p phase shift, which is equivalent to modulating along the real axis. Two pixels are combined into a macropixel using a phase-detour technique enabling full complex modulation. The method is used as the filter for a conventional optical correlator and in a digital-optical hybrid correlator. © 2002 Society of Photo-Optical Instrumentation Engineers.

Item Type: Article
Additional Information: This paper was invited for a special issue on Advances in Pattern Recognition, Techniques, Devices and Algorithms in Optical Engineering. This was EPSRC funded research (GR/L90774/01) and describes the construction of the optical/digital hybrid correlator invented in our group. The complex wavefront modulation method I developed in reference one was implemented within the correlator and the results are analysed. This technique later made it possible to realize difficult to implement filters such as the Wiener filter. The system demonstrates high speed pattern matching. This has been further developed by the IIT (, and Richard Hartman of AOS Inc (
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Philip Birch
Date Deposited: 06 Feb 2012 21:26
Last Modified: 03 Apr 2012 08:55
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