Character recognition system and its use in an optical document

Details Character recognition system and its use in an optical document Character recognition system and its use in an optical document

1982-12-16

1986-04-22

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358282, 382 7, G06K 938

Patent

active

045847037

ABSTRACT:
A character recognition system comprises a video detector (25) operating with a plurality of threshold signals (V3-V6) in time multiplex mode. Detected video signals are stored in a plurality of storage modules (S3-H S6), one for each time multiplex channel. A signal processor (81) recognizes character data from video data representing a first threshold level (V3) and stored in a first storage module (S3) and subsequently recognizes character data from video data representing a second threshold level (V5) and stored in a second storage module (S3). The system is used in an optical document reader for reading a plural field print line on a document, where the optical characteristics of the various fields are unequal.

REFERENCES:
patent: 3104372 (1963-09-01), Rabinow et al.
patent: 3676847 (1972-07-01), Partin
patent: 3715724 (1973-02-01), Demonte et al.
patent: 4021777 (1977-05-01), Shepard
patent: 4239151 (1980-12-01), Enser et al.
patent: 4274079 (1981-06-01), Todd et al.
patent: 4295121 (1981-10-01), Enser et al.
J. E. Rohen, "Multi-Code Scanner", IBM Technical Disclosure Bulletin, vol. 23, No. 8, pp. 3613-3614, Jan., 1981.
M. M. Siverling, "Video Thresholding for Character Recognition", IBM Technical Disclosure Bulletin, vol. 17, No. 1, pp. 208-209, Jun., 1974.

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