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. 01, 2009
Filed:
Dec. 21, 2006
Tomohisa Itagaki, Abiko, JP;
Nobuatsu Sasanuma, Abiko, JP;
Masami Tomita, Matsudo, JP;
Toshio Saishoji, Fuchu, JP;
Satoshi Takayama, Chofu, JP;
Miyoko Hayashi, Fuchu, JP;
Tomohisa Itagaki, Abiko, JP;
Nobuatsu Sasanuma, Abiko, JP;
Masami Tomita, Matsudo, JP;
Toshio Saishoji, Fuchu, JP;
Satoshi Takayama, Chofu, JP;
Miyoko Hayashi, Fuchu, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
Color reproducibility needs to be evaluated in consideration of the influence of homogeneity in page image. Hence, a first chart is formed from an image of a uniform density of a region to be evaluated, and data associated with the spectral reflectances of plural points on the first chart are input. Based on the data obtained from the first chart, color differences between a predetermined point and other points on the first chart are calculated. When the calculated color differences fall within a permissible range of heterogeneity of colors in the region, a second chart is formed from an image corresponding to a color target, and data associated with the spectral reflectances of plural points on the second chart are input. Color differences are calculated from the data obtained from the second chart and data associated with the spectral reflectance of the color target.