Color image reading apparatus having common circuitry for the co

Details Color image reading apparatus having common circuitry for the co Color image reading apparatus having common circuitry for the co

1989-08-29

1991-08-06

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358 75, H04N 907

Patent

active

050382071

ABSTRACT:
A color image reading apparatus includes reading circuitry for reading a color image and dot sequentially outputting a plurality of color component signals. Common amplifying circuitry is provided for sequentially amplifying the plurality of analog color component signals which are dot sequentially output from the reading circuitry. Common converting circuitry is provided for sequentially converting the plurality of color component signals, which are amplified by the common amplifying circuitry, into a plurality of digital color component signals. Separating circuitry is provided for separating the plurality of digital color component signals, which are converted by the common converting circuitry, into digital color component signals of each color. Finally, switching circuitry is provided for sequentially switching a gain of the amplifying circuitry in accordance with a color of the analog color signal to be amplified.

REFERENCES:
patent: 4638352 (1987-01-01), Noda
patent: 4774566 (1988-09-01), Kawamura et al.
patent: 4839719 (1989-06-01), Hirota
patent: 4860092 (1989-08-01), Hieda
patent: 4862286 (1989-08-01), Suda et al.
patent: 4866513 (1989-09-01), Takahashi
patent: 4887150 (1989-12-01), Chiba
patent: 4891690 (1990-01-01), Hasegawa et al.

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