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:
Dec. 16, 2014
Filed:
Dec. 09, 2010
Akitoshi Yamada, Yokohama, JP;
Ryosuke Iguchi, Kawasaki, JP;
Nobutaka Miyake, Yokohama, JP;
Tohru Ikeda, Yokohama, JP;
Mitsuhiro Ono, Tokyo, JP;
Fumitaka Goto, Tokyo, JP;
Hidetsugu Kagawa, Kawasaki, JP;
Tomokazu Ishikawa, Kawasaki, JP;
Junichi Nakagawa, Tokyo, JP;
Senichi Saito, Kawasaki, JP;
Akitoshi Yamada, Yokohama, JP;
Ryosuke Iguchi, Kawasaki, JP;
Nobutaka Miyake, Yokohama, JP;
Tohru Ikeda, Yokohama, JP;
Mitsuhiro Ono, Tokyo, JP;
Fumitaka Goto, Tokyo, JP;
Hidetsugu Kagawa, Kawasaki, JP;
Tomokazu Ishikawa, Kawasaki, JP;
Junichi Nakagawa, Tokyo, JP;
Senichi Saito, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
When printing an image using a plurality of inks, color unevenness caused by variations in ejection characteristics among nozzles is corrected at suitable timings in accordance with change in the color unevenness over time, and favorable image output without noticeably color unevenness is maintained. For this purpose, parameters are prepared, for colors formed by combinations of at least two colors of ink, the parameters being determined so as to reduce differences in coloration on a print medium caused by individual variations in the ejection characteristics of a plurality of nozzles. When printing, a first color signal included in individual pixels is corrected for a second color signal by using the parameters. Information regarding the ejection volume characteristics of a plurality of nozzles is acquired as appropriate, and by estimating changes in coloration from this information, suitable timings for overwriting such parameters are determined.