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. 16, 1999
Filed:
Nov. 25, 1996
Applicant:
Inventors:
Jun Oida, Kawasaki, JP;
Atsushi Nakamura, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ; H04N / ;
U.S. Cl.
CPC ...
382274 ; 358445 ; 358446 ; 358461 ; 358497 ;
Abstract
In an image processing device, a white level reference value is obtained by allowing an CCD sensor to scan a white level standard sheet. The white level reference value is stored in SRAM which is resident in a scan cartridge. The white level reference value in the SRAM is modified when an original document is read through a clear sheet, to obtain a high-quality image.