Naslov
Optimization in mapping of correlation filters in a liquid crystal display based frequency plane correlator

Autori
Demoli, Nazif ; Hirsch, Alexander ; Krueger, Sven ; Wernicke, Guenther ; Gruber, Hartmut ; Senoner, Mathias

Izvornik
Optical Engineering (0091-3286) 38 (1999), 6; 1058-1064

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
liquid crystal display; spatial light modulators; phase-only filters; optical pattern recognition

Sažetak
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 (0,2PI) 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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