The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2005
Filed:
Jul. 29, 2004
Hideya Fujihara, Nirasaki, JP;
Hikaru Ootsuka, Yamanashi-ken, JP;
Hideya Fujihara, Nirasaki, JP;
Hikaru Ootsuka, Yamanashi-ken, JP;
Nisca Corporation, Yamanashi-Ken, JP;
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.