Binary character signal producing apparatus

Details Binary character signal producing apparatus Binary character signal producing apparatus

1985-02-08

1987-06-23

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 18, 382 51, G06K 938

Patent

active

046759093

ABSTRACT:
A character recognition circuit slices the character signal received from an optical scanner and counts a number of black bits at multiple levels. The number of black bits are normalized in accordance with the character row length. A pair of level judging circuits responds to the normalized black bits at the respective multiple levels to derive slicing levels for both the character and the background. Responsive thereto a binary signal is produced in accordance with the slice level. Thus, the differences in the background signals do not have an effect upon the recognization of the character signals.

REFERENCES:
patent: 3466603 (1969-09-01), Shelton, Jr.
patent: 3479642 (1969-11-01), Bartz
patent: 3668637 (1972-06-01), Sakai et al.
patent: 3705383 (1972-12-01), Frayer
patent: 4064484 (1977-12-01), Mese et al.
patent: 4566125 (1986-01-01), Clunn

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