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Optical pattern recognition of letters by a joint-transform correlator using a ferroelectric liquid-crystal spatial light modulator

Tadao Iwaki, Yasuyuki Mitsuoka

Abstract

The use of a joint-transform correlator (JTC) as an optical pattern-recognition system for letters has been studied. The system incorporates a ferroelectric liquid-crystal spatial light modulator (LAPS-SLM). The LAPS-SLM has a high contrast ratio and a fast response time, permitting the JTC to recognize more reference letters simultaneously than a classical correlator can.

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Available abstract

Key concepts: Spatial light modulator, Optics, Optical correlator, Ferroelectricity, Optical modulator, Liquid crystal, Spatial frequency, Joint (building)