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:
Feb. 15, 2011
Filed:
May. 07, 2007
Osamu Iwasaki, Tokyo, JP;
Naoji Otsuka, Kanagawa, JP;
Hitoshi Nishikori, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image processing apparatus for processing multilevel image data including values of respective color components includes an adding unit configured to add quantization errors to the respective values of the color components of a target pixel, an output determination unit configured to perform quantization to determine output values of the respective color components of the target pixel based on a combination of the values of the respective color components to which the quantization errors are added, and an error calculation unit configured to calculate quantization errors of the respective color components of the target pixel based on the output values of the respective color components and the values of the respective color components to which the quantization errors are added. In addition, a distribution weight determination unit is configured to determine distribution weights for the respective color components in accordance with a combination of the values of the respective color components of the target pixel, and an error diffusion unit is configured to distribute the calculated quantization errors of the respective color components of the target pixel to values of the respective color components of neighboring pixels in accordance with the determined distribution weights.