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

Mark A. Neifeld

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The optical disk is a computer-addressable binary storage medium with very high capacity. More than 1010 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 imagesstored 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.

Original languageEnglish (US)
Pages (from-to)4398-4409
Number of pages12
JournalApplied optics
Issue number23
StatePublished - Aug 10 1993


  • Associative memory
  • Image correlation
  • Optical disk
  • Photorefractive media

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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