Image reading apparatus and method of determining gain value...

Details Image reading apparatus and method of determining gain value... Image reading apparatus and method of determining gain value...

2005-11-22

2005-11-22

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S153000

Reexamination Certificate

active

06967605

ABSTRACT:
An image reading apparatus includes a light source for irradiating an original; a photoelectric converter for converting light reflected from the original to an analog signal; an A/D converter for converting the analog signal corresponding to each pixel from the photoelectric converter to the digital signal; and an adjusting device connected between the photoelectric converter and the A/D converter for performing an offset processing and a gain processing of the analog signal from the photoelectric converter. A memory stores a relational formula representing a correlation between an offset value for the offset processing and a gain value for the gain processing. An offset value calculating device obtains an offset value corresponding to a gain value used in the gain processing of the analog signal by using the gain value and the relational formula stored in the memory.

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patent: 5874909 (1999-02-01), Soenen et al.
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patent: 6903670 (2005-06-01), Lee et al.
Patent Abstract of Japan; Publication No. 10-2339903; Publication Date Sep. 2, 1998; Applicant Canon Inc.

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