Pattern recognition apparatus and a pattern recognition method

Details Pattern recognition apparatus and a pattern recognition method Pattern recognition apparatus and a pattern recognition method

1983-09-13

1987-03-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 8, 382 37, 382 42, G06K 968

Patent

active

046513418

ABSTRACT:
A pattern recognition apparatus and method, the apparatus comprising a correlation calculating circuit for calculating first correlations between each part of a image pattern data and a reference pattern data, the first correlation being expressed as R(X), where X is a variable factor representing a region storing the part of the image pattern data, and also comprising a second correlation calculating circuit for recognizing the position of a pattern most identical to the reference pattern by emphasizing the maximum value of the first correlations by converting each of the first correlations R(X) into a second correlation expressed as [R(X)-R(X-.alpha.)]-[R(X+.alpha.)-R(X)], where .alpha. is a predetermined value determined in accordance with the size of the reference pattern data.

REFERENCES:
patent: 3614736 (1971-10-01), McLaughlin et al.
patent: 4074231 (1978-02-01), Yajima et al.
patent: 4091394 (1978-05-01), Kashioka et al.
patent: 4153897 (1979-05-01), Yasuda et al.
patent: 4200861 (1980-04-01), Hubach et al.
patent: 4334241 (1982-06-01), Kashioka et al.
patent: 4450579 (1984-05-01), Nakashima et al.
J. S. Boland et al, "Design of a Correlator for Real-Time Video Comparisons", 1979.
P. S. Burggraff, "Pattern Recognition on Bonders and Probers", Semiconductor International, Feb. 1981, pp. 53-70.

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