Image reading apparatus which adjusts image signals to improve s

Details Image reading apparatus which adjusts image signals to improve s Image reading apparatus which adjusts image signals to improve s

1987-11-12

1989-08-29

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358 75, 35821316, H04N 110, H04N 1024

Patent

active

048622869

ABSTRACT:
An image reading apparatus includes a plurality of linear sensors for reading an image of a document. Each linear sensor reads a different portion of a line of the document in a divided manner. A plurality of clamp circuits control black levels of signals generated by the plurality of linear sensors to be a black reference level. A plurality of multipliers control white levels of signals generated by the plurality of linear sensor means which are level-controlled by the clamp circuits so as to be a white reference level.

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patent: 4729035 (1988-03-01), Tanioka
patent: 4734787 (1988-03-01), Hayashi

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