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. 29, 2011
Filed:
Oct. 21, 2009
Kenzo Tojima, Tokyo, JP;
Hiroki Kitamura, Kawasaki, JP;
Yoshiyuki Akiba, Yokohama, JP;
Tsutomu Takata, Yokohama, JP;
Shuichi Nakamura, Kawasaki, JP;
Yusuke Yamamoto, Tokyo, JP;
Masanao Motoyama, Tokyo, JP;
Takeshi Akiyama, Tokyo, JP;
Takaaki Nagaoka, Hadano, JP;
Kenzo Tojima, Tokyo, JP;
Hiroki Kitamura, Kawasaki, JP;
Yoshiyuki Akiba, Yokohama, JP;
Tsutomu Takata, Yokohama, JP;
Shuichi Nakamura, Kawasaki, JP;
Yusuke Yamamoto, Tokyo, JP;
Masanao Motoyama, Tokyo, JP;
Takeshi Akiyama, Tokyo, JP;
Takaaki Nagaoka, Hadano, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A color image forming apparatus of a so-called tandem type which has image forming units in correspondence with colors is provided. In the color image forming apparatus, a color discrepancy amount storage unit stores information of a color discrepancy amount of each of the image forming units, which is measured in advance. A first color discrepancy correcting unit performs color discrepancy correction in a pixel unit by performing coordinate conversion of bitmap data to be printed based on the information of the color discrepancy amount stored in the color discrepancy amount storage unit. A second color discrepancy correcting unit performs color discrepancy correction in less than a pixel unit by performing tone correction of the bitmap data corrected by the first color discrepancy correcting unit based on the information of the color discrepancy amount stored in the color discrepancy amount storage unit.