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:
May. 29, 2007
Filed:
Jan. 22, 2003
Applicants:
Maya Rani Gupta, Menlo Park, CA (US);
Kathrin Berkner, Menlo Park, CA (US);
Martin Boliek, San Francisco, CA (US);
Inventors:
Maya Rani Gupta, Menlo Park, CA (US);
Kathrin Berkner, Menlo Park, CA (US);
Martin Boliek, San Francisco, CA (US);
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04N 1/52 (2006.01); H04N 1/60 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and apparatus for performing ink reduction error diffusion are described. In one embodiment, the method comprises performing vector error diffusion and mapping anchors to printing colors, where performing vector error diffusion includes quantizing each input pixel value to a closest anchor in an anchor set, calculating errors based on differences between the input pixel values and the anchors, and performing error filtering based on calculated errors.