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Published August 10, 1993 | public
Journal Article Open

Programmable image associative memory using an optical disk and a photorefractive crystal


The optical disk is a computer-addressable binary storage medium with very high capacity. More than 10^10 bits of information can be recorded on a 12-cm-diameter optical disk. The natural two-dimensional format of the data recorded on an optical disk makes this medium particularly attractive for the storage of images and holograms, while parallel access provides a convenient mechanism through which such data may be retrieved. In this paper we discuss a closed-loop optical associative memory based on the optical disk. This system incorporates image correlation, using photorefractive media to compute the best association in a shift-invariant fashion. When presented with a partial or noisy version of one of the images stored on the optical disk, the optical system evolves to a stable state in which those stored images that best match the input are temporally locked in the loop.

Additional Information

© Copyright 1993 Optical Society of America. Received 25 February 1992. This work was funded by the U.S. Army Research Office. We thank R.R. Neurgaonkar for the SBN crystal used in the experiments. The authors also thank Alan Yamamura, Seiji Kobayashi, and the Sony Corporation for assistance with the optical-disk-writing system.


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