Abstract

Real-time all-optical Wiener–Kolmogorov filtering is demonstrated by using two coupled photorefractive phase-conjugate mirrors. A novelty filtering system based on the combination of the present operation and the operation of real-time image subtraction previously presented [Opt. Lett. 13, 503 (1988)] is outlined. By comparing an input signal pattern with a set of known stored patterns, all known information in the input would be eliminated from the output, while any novel information would appear. This latter scheme could also be used in image-synthesis applications.

© 1989 Optical Society of America

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