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Computer Generated Complex Filter for an All Optical and a Digital Optical Hybrid Correlator
journal contribution
posted on 2023-06-08, 10:00 authored by Phil BirchPhil Birch, Rupert YoungRupert Young, Frederic Claret-Tournier, David Budgett, Chris ChatwinChris ChatwinWe 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.
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Publication status
- Published
Journal
Optical EngineeringISSN
0091-3286External DOI
Issue
105Volume
41Page range
105-111Pages
6.0Department affiliated with
- Engineering and Design Publications
Notes
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 (joby@physics.iitd.ernet.in), and Richard Hartman of AOS Inc (hartman@aos-inc.com).Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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