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, 1999
Filed:
Nov. 30, 1992
Applicant:
Inventor:
Raphael L Levien, McDowell, VA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
358456 ;
Abstract
In an error diffusion halftone screen generation system, improved image smoothness in the highlight and shadow areas is obtained by calculating the distance to the nearest previously generated output dot. The square of the distance to the nearest previously generated dot is used as a bias value to effectively modulate the error diffusion threshold. The resulting output provides a halftone with a more uniform texture in the highlight and shadow areas of the screened image. The resulting pattern resembles the pattern of dots produced by tightly packing imaginary circles in the image plane, and placing an output dot at the center of each such tightly packed imaginary circle.