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

H - Electricity

04

N

350/15

H04N 1/04 (2006.01) H04N 1/407 (2006.01)

Patent

CA 1147846

ABSTRACT OF THE DISCLOSURE 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.

370516

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