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:
Nov. 06, 2007
Filed:
Jun. 20, 2000
Maya Rani Gupta, Seattle, WA (US);
Michael J. Gormish, Redwood City, CA (US);
Kathrin Berkner, Palo Alto, CA (US);
David G. Stork, Portola Valley, CA (US);
Maya Rani Gupta, Seattle, WA (US);
Michael J. Gormish, Redwood City, CA (US);
Kathrin Berkner, Palo Alto, CA (US);
David G. Stork, Portola Valley, CA (US);
Ricoh Co., Ltd., Tokyo, JP;
Abstract
A method and apparatus for block quantization for color halftoning is described. In one embodiment, the method comprises dividing an input image and an output image into blocks, wherein each block in the output image corresponds to one block in the input image. The method also includes dividing each block into subblocks if an edge exists in said each block, calculating a color average of each input block, and calculating a set of output colors for each block in the output image to match the color average of its corresponding block in the input image.