Pattern preliminary processing system

Details Pattern preliminary processing system Pattern preliminary processing system

1974-10-15

1976-08-03

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401463MA, G06K 912

Patent

active

039732398

ABSTRACT:
A pattern preliminary processing system wherein high and low frequency noise other than the pattern signal from a pick-up tube are eliminated by a filtering circuit thereby to "relieve" the pattern against the background and the thus obtained pattern signal is tri-valued into signals of high, medium and low levels by means of a processing circuit having two different threshold values, and then the signal of the medium level is converted into a signal of high or low level with reference to peripheral information thereby to finally bi-value the pattern signal.

REFERENCES:
patent: 3104372 (1963-09-01), Rabinow et al.
patent: 3234513 (1966-02-01), Brust
patent: 3675201 (1972-07-01), McKissick et al.
patent: 3688266 (1972-08-01), Watanabe et al.
patent: 3701095 (1972-10-01), Yamaguchi et al.
patent: 3715724 (1973-02-01), DeMonte et al.

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