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:
May. 10, 2005
Filed:
Aug. 29, 2001
Yoshikazu Inoue, Kanagawa, JP;
Wataru Nara, Kanagawa, JP;
Yasuyuki Nomizu, Kanagawa, JP;
Hiroyuki Kawamoto, Kanagawa, JP;
Hiroshi Fukano, Chiba, JP;
Motoya Sano, Tokyo, JP;
Hiroshi Kubo, Saitama, JP;
Hitoshi Hattori, Tokyo, JP;
Yoshikazu Inoue, Kanagawa, JP;
Wataru Nara, Kanagawa, JP;
Yasuyuki Nomizu, Kanagawa, JP;
Hiroyuki Kawamoto, Kanagawa, JP;
Hiroshi Fukano, Chiba, JP;
Motoya Sano, Tokyo, JP;
Hiroshi Kubo, Saitama, JP;
Hitoshi Hattori, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image-reading device is provided. The image-reading device comprises a photoelectric converting element reading a first image from a subject copy, a reference-white member functioning as a reference white used in a white-shading correction, reading means for reading a second image from a constant range on a surface of the reference-white member by using the photoelectric converting element, averaging means for dividing image data of the second image into a plurality of blocks in a sub-scanning direction so that each of the blocks includes a plurality of lines and obtaining average values of image data of the lines in the blocks respectively, peak-value determining means for obtaining a peak value of the average values, and white-shading correcting means for performing the white-shading correction to image data of the first image by using the peak value as white-shading data.