Image reader, image forming and reproducing apparatus, and...

Details Image reader, image forming and reproducing apparatus, and... Image reader, image forming and reproducing apparatus, and...

2005-02-07

2009-10-20

Grant, II, Jerome (Department: 2625)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S406000

Reexamination Certificate

active

07605951

ABSTRACT:
An image reader comprises an image sensor configured to receive a light beam reflected from an original to be read and output an analog pixel signal corresponding to a light quantity of the received light beam; a variable-gain amplifier configured to amplify the analog pixel signal to a prescribed level; an analog-to-digital converter configured to convert the amplifier analog pixel signal to digital image data; and correction means for performing correction on the A/D converted digital image data according to a prescribed criterion, using a data value corresponding to an original level of the analog pixel signal before the amplification.

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