1 June 1999 Optimization in mapping of correlation filters in a liquid crystal display based frequency plane correlator
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Optical Engineering, 38(6), (1999). doi:10.1117/1.602150
Abstract
An optimization procedure for the optical implementation of correlation filters (CFs) in an optical-hybrid frequency plane correlator is presented. Our approach is based on mapping of the given calculated CF values to the values constrained by the available spatial light modulator (SLM) device to achieve the maximum intensity of the output correlation peak. The optimization is provided for the implementation of the CFs using a Sanyo liquid crystal display (SLCD). The commercially available SLCDs are characterized by the phase modulation curves that are (1) nonlinear, (2) of a smaller total phase change interval than desired (0,2?) interval, and (3) significantly disturbed by the coupled amplitude variations. For such a case, the optimization achieved by varying a phase shift parameter is explained theoretically, demonstrated numerically, and confirmed experimentally.
Nazif Demoli, Alexander Hirsch, Sven Krueger, Guenther K.G. Wernicke, Hartmut Gruber, Mathias Senoner, "Optimization in mapping of correlation filters in a liquid crystal display based frequency plane correlator," Optical Engineering 38(6), (1 June 1999). http://dx.doi.org/10.1117/1.602150
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KEYWORDS
Spatial light modulators

LCDs

Optical correlators

Image filtering

Phase shifts

Fourier transforms

Phase only filters

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