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Optical correlation of phase- and amplitude-encoded objects using wavelength-multiplexed holographic storage elements

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Abstract

Optical image correlation has been demonstrated for recognition of patterns and images by comparing against stored reference filters corresponding to known images. Optical implementation of this operation is highly desirable because image correlation can be generated in an analog fashion using common optical elements, providing considerable speed advantages over digital computation. Spatial light modulators have been used as the filters in a vanderLugt correlator configuration, but low throughput and slow download times, particularly for a large number high resolution images, were major drawbacks. Using a wavelength multiplexed holographic element for storage of the reference image filters provides increased access speed, and the recent availability of visible wavelength, tunable external cavity semiconductor lasers, wavelength multiplexing becomes practical. In this paper, we report on an optical image correlation system using a holographic storage element for fast access speed and translation tolerance. Amplitude and phase encoded transparencies, as well as spatial light modulators, were used as the input image sources.

© 1996 Optical Society of America

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