Image information reading apparatus

Details Image information reading apparatus Image information reading apparatus

1977-07-21

1979-01-02

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

307360, G06K 900

Patent

active

041329775

ABSTRACT:
An image information reading apparatus, wherein another comparator having a deep slice level is provided apart from a usual comparator having an ordinary slice level, and determination is made continuously as to whether a white portion of a small area is included in the black background being scanned and either of the said two comparators is enabled as a function of the determination, whereby a clear reproduced image is obtained with ease.

REFERENCES:
patent: 3582887 (1971-06-01), Guthrie
patent: 3668637 (1972-06-01), Sakai et al.
patent: 3688266 (1972-08-01), Watanabe et al.
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 4003024 (1977-01-01), Riganati et al.

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