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:
Jul. 23, 2013
Filed:
Mar. 02, 2010
Kan Kitagawa, Yokohama, JP;
Mizuki Hayakawa, Kawasaki, JP;
Kan Kitagawa, Yokohama, JP;
Mizuki Hayakawa, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention is made to solve the problem that the conventional method cannot correctly determine whether an original is a halftone. To solve this, a method according to this invention detects, from an original, first and second feature pixels respectively exhibiting first and second features. A first feature pixel to first feature pixel distance and second feature pixel to second feature pixel distance are calculated from neighboring first feature pixels and neighboring second feature pixels, respectively. The average of the first feature pixel to first feature pixel distance and the neighboring second feature pixel to second feature pixel distance is calculated as a feature pixel to feature pixel distance. A histogram is generated by the appearance count of only a feature pixel to feature pixel distance for which the same value successively appears. Whether the read original is a halftone is discriminated based on this histogram.