Auto and hetero-associative memory using a 2-D optical logic gat

Details Auto and hetero-associative memory using a 2-D optical logic gat Auto and hetero-associative memory using a 2-D optical logic gat

1990-02-16

1992-07-14

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 31, 365 49, 359107, 359108, 359559, 359561, G06K 974

Patent

active

051310554

ABSTRACT:
An optical system for auto-associative and hetero-associative recall utilizing Hamming distance as the similarity measure between a binary input image vector V.sup.(k) and a binary image vector V.sup.(m) in a first memory array using an optical Exclusive-OR gate for multiplication of each of a plurality of different binary image vectors in memory by the input image vector. After integrating the light of each product V.sup.(k) .times.V.sup.(m), a shortest Hamming distance detection electronics module determines which product has the lowest light intensity and emits a signal that activates a light emitting diode to illuminate a corresponding image vector in a second memory array for display. That corresponding image vector is identical to the memory image vector V.sup.(m) in the first memory array for auto-associative recall or related to it, such as by name, for hetero-associative recall.

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R. P. Lippmann, "An Introduction to Computing with Neural Nets", IEEE ASSP Magazine, pp. 4-22, Apr. 1987.

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