Abstract

Recently, the low-cost black-and-white liquid crystal TV has been applied to real-time optical signal processing. In this work a color liquid crystal TV was used as a spatial light modulator to perform polychromatic real-time pattern recognition. The pixel structure of the LCTV display panel provides multiple Fourier spectra of the input signal. An individual polychromatic Fourier spectrum consists of several colors corresponding to the polychromatic light used. Particular color filters were placed prior to the individual Fourier spectrum in order to synthesize monochromatic holographic matched spatial filters. The phase variation of the display panel obscures the spatial-invariant processing to a certain degree. However, two-color optical correlation has been performed successfully in a simple polychromatic pattern recognition.

© 1986 Optical Society of America