Image reading apparatus and image reading method

Details Image reading apparatus and image reading method Image reading apparatus and image reading method

2008-04-24

2010-12-07

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S529000, C348S243000

Reexamination Certificate

active

07847978

ABSTRACT:
An image reading apparatus is provided which includes a contact image sensor comprised of a plurality of sensor chips arranged in series, an analog image processor for processing an analog image signal from the contact image sensor, a unit for conducting black shading correction for each pixel and a unit for conducting white shading correction for each pixel. The image reading apparatus further includes a unit for digitally monitoring a black offset value corresponding to each chip with respect to the signal that has been processed by the analog image processor and a unit for adding and subtracting a black offset variation amount for each chip in the previous stage of the unit for conducting black shading correction for each pixel, and corrects black offset based on an instruction of a control unit.

REFERENCES:
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patent: 6160578 (2000-12-01), Carroll et al.
patent: 7064871 (2006-06-01), Yamagata et al.
patent: 6-164938 (1994-06-01), None
patent: 2001-28666 (2001-01-01), None
Japanese Official Communication dated Aug. 7, 2007, regarding Application No. 2002-292409.
“TC255P 336×244 Pixel CCD Image Sensor”, Texas Instruments, Jun. 1996.

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