Data base searching

Details Data base searching Data base searching

1990-11-21

1993-06-15

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

359 29, 359561, 364822, G06K 976

Patent

active

052206220

ABSTRACT:
A holographic optical correlator includes a matched optical filter and control means therefor including a memory. In use searching for occurrences of an item to be found is carried out by the control means controlling the input and Fourier transform planes of the filter and a coherent light source for parallel optical processing of the memory content and the output plane of the filter provides information to the control means as to the location in the memory of occurrences of said item. The complexity of the detector means in the output plane can be reduced in comparison with previous proposals by moving the item to be sought step-wise across the input plane. The detector means then may comprise a single column of detectors which are required to detect a peak correlation signal within a predetermined range.

REFERENCES:
patent: 3668635 (1972-06-01), Mizobuchi et al.
patent: 4174179 (1979-11-01), Ts-Chudi et al.
patent: 4701879 (1987-10-01), Scarr
patent: 4837843 (1989-06-01), Oweckko
patent: 5028102 (1991-07-01), Ogura et al.
patent: 5086483 (1992-02-01), Capps
Journal of Optics vol. 20, No. 4, Jul./Aug. 1989 pp. 181-185 Paris. C. Ferreira et al "Anamghoric correlator for character recognition."

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