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:
Jun. 29, 2004
Filed:
Sep. 25, 2001
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A printhead including plural groups of nozzles, which are provided for plural types of ink and each group of nozzles consists of a plurality of nozzles corresponding to one type of ink, is used to print a pixel with dots which are formed with plural types of ink. For the plural groups of nozzles in the printhead, a per-nozzle density table, indicative of a print density for each nozzle constituting the group of nozzles, is provided. With respect to a pixel of interest, a nozzle to be driven for discharge is determined, and a print density of the pixel of interest is calculated with reference to the per-nozzle density table. Based on the calculated print density of the pixel and a print density of the pixel designated by image data, error diffusion processing is performed. Density unevenness in the nozzles is corrected in this manner to achieve high-quality image forming.