Binary pattern signal producing apparatus for optical character

Details Binary pattern signal producing apparatus for optical character Binary pattern signal producing apparatus for optical character

1982-02-04

1984-10-02

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 48, 382 50, G06K 900

Patent

active

044752342

ABSTRACT:
A binary pattern signal producing apparatus for optical character recognition comprises a pre-scanning section for determining an area containing the information to be scanned, a scanning apparatus for producing a signal in accordance with the luminance of the scanning area, an automatic gain control circuit for controlling the level of the information signal in accordance with the level of a portion of the same information signal representing less than the entire scanned area, and a comparison circuit responsive to the output of the automatic gain control circuit for generating the binary pattern signal. In addition to or in place of a gate circuit which is used to provide only a portion of the information signal to the gain control terminal of the automatic gain control device, the apparatus may include noise eliminating circuitry for removing pulsive noise from the gain control signal.

REFERENCES:
patent: 4034341 (1977-07-01), Isono et al.
patent: 4158835 (1979-06-01), Miura et al.
patent: 4162481 (1979-07-01), DuVall

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