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:
Jun. 19, 2012
Filed:
Mar. 06, 2009
Makoto Arima, Abiko, JP;
Makoto Arima, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
When an auto document feeder feeds an original to an original image reading platen, a CCD line sensor reads the original along the main scanning direction perpendicular to the feeding direction of the original. A string detection circuit detects a streak parallel to the feeding direction in the image. A string correction circuit corrects the detected streak. In particular, for a predetermined number of sub-scanning positions that are located in the same main scanning position as the main scanning position at which the streak has been detected by the string detection circuit and that exist subsequent to the sub-scanning position at which the streak has been detected, correction is performed by the string correction circuit even when no streak is detected by the string detection circuit.