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:
Oct. 03, 1995
Filed:
May. 27, 1993
Steven J Friedman, Bellevue, WA (US);
Karen A Hargrove, Redmond, WA (US);
Joseph M Joy, Redmond, WA (US);
Nathan P Myhrvold, Bellevue, WA (US);
Sunita Shrivastava, Redmond, WA (US);
Gideon A Yuval, Mercer Island, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A high color resolution image is accurately approximated with a low resolution image through a unique combination of ordered dithering and error diffusion. The true color of each pixel is modified with error from previously rendered pixels and then dithered to an intermediate color of 15 bits. The intermediate color is then mapped to the nearest displayable color in a displayable color palette using a precomputed look-up table. Any error between a displayed color of a pixel and its true color is calculated and spread among neighboring pixels not yet rendered.