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:
Apr. 16, 2002
Filed:
Apr. 28, 1998
Applicant:
Inventor:
Kenichi Ohta, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 9/00 ;
U.S. Cl.
CPC ...
G06K 9/00 ;
Abstract
Data for color conversion which is previously stored in a ROM is transferred to a three-dimensional look-up table when a color copier is turned on. By referring to R, G, B, signals, which have been previously stored in a buffer memory, in accordance with M, C, Y, Bk signals output in synchronization with the printing operation of a printer, a CPU rewrites the data in the look-up table to appropriate data (M, C, Y, Bk output signal values). A color signal processing circuit refers to the updated look-up table and outputs M, C. Y, Bk color signals that correspond to entered R, G, B signals.