Facsimile method and apparatus for setting white level

Details Facsimile method and apparatus for setting white level Facsimile method and apparatus for setting white level

1980-02-11

1982-05-11

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

3401463AG, 358280, H04N 140

Patent

active

043297170

ABSTRACT:
A facsimile method and apparatus wherein the white level is set during prescanning in one direction from a first extremity to a second extremity of a document. Scanning then proceeds with the white level set in a second direction from the second extremity to the first extremity. The white level is set using variable gain amplifier means comprising a digital-to-analog converter and gain control means comprising a digital register which stores a binary word representing the whitest level sensed during prescanning in the first direction.

REFERENCES:
patent: 4133008 (1979-01-01), Tisue
IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 113-114.

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