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An optical pattern recognition system and methods for spatial light modulator with ferroelectric liquid crystals
An optical pattern recognition system and methods for spatial light modulator with ferroelectric liquid crystals
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机译：具有铁电液晶的空间光调制器的光学图案识别系统和方法
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摘要
A method of driving a ferroelectric liquid crystal spatial light modulator at high speed is provided. An optical pattern recognition system is also provided which is capable of recognizing or identifying two-dimensional image information in real time by using this method.;The driving method includes a means for driving the optically addressed type ferroelectric liquid crystal spatial light modulator without a light reflection separation layer; a means for modulating the intensities of the writing light and the reading light emitted from a laser diode and from a liquid crystal light shutter which uses a ferroelectric liquid crystal as the light modulating medium; and a means for synchronizing the spatial light modulator driving means with the means for modulating the intensities of the writing and reading light. The driving method is characterized in that it tops emitting the reading light while the write voltage is applied to the spatial light modulator. The optical pattern recognition system is a joint transform light correlator which performs the following operations: simultaneously Fourier-transforming by using coherent light at least one reference image including specified marks and at least one input image to be entered; displaying the Fourier-transformed image on the optically addressed type spatial light modulator; and Fourier-transforming the displayed Fourier-transformed image again to produce correlation peaks that correspond to the two-dimensional correlation coefficients between the reference image and the input image. The means for generating the coherent light is the laser diode, and the means for performing the Fourier transform two times is one and the same Fourier transform lens.
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