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:
Jan. 09, 2007
Filed:
Oct. 01, 1999
Wataru Nara, Kanagawa, JP;
Wataru Nara, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A CCD photoelectrically converts image information obtained from optically reading an original image, line by line, and outputs an image signal. Several of the photoelectric sensors of a CCD of the CCD portion form an optical black portion. A black shading correcting portion corrects the image signal using a black reference level. The black reference level is obtained from the optical black portion of the CCD for each line during an operation of the reading of the original image. The black reference level used by said black shading correcting portion for each line is obtained using black reference values, each of the black reference values being data of the optical black portion for a respective one of a plurality of lines.