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. 10, 2014
Filed:
Dec. 12, 2011
Makoto Arima, Abiko, JP;
Makoto Arima, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A document reading apparatus, including: a conveyance portion which conveys a document; an illuminator which illuminates the conveying document; a reading portion which reads the conveying document at a read position; a reference member arranged opposite to the read position; a correction condition calculating portion which calculates a correction condition corresponding to each of a plurality of pixel positions based on image data obtained by the reading portion reading the reference member; and a correction portion which corrects image data of the document using the correction condition, wherein the correction condition calculating portion obtains a plurality of image data of the reference member corresponding to a first pixel position and its peripheral pixel position, and calculates a correction condition at the first pixel position based on remaining image data after excluding high brightness image data and low brightness image data.