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:
Dec. 17, 2002
Filed:
Feb. 08, 1999
Applicant:
Inventor:
Chingwei Chang, Vancouver, WA (US);
Assignee:
Sharp Laboratories of America, Incorporated, Camas, WA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N 1/40 ; G06K 9/46 ;
U.S. Cl.
CPC ...
H04N 1/40 ; G06K 9/46 ;
Abstract
A method for error diffusion in digital printing. The method selects a base threshold value for printing of digital data, determines an offset value, and then calculates at least two threshold values from the base threshold value and the offset value. The thresholds are applied to the image along directional guided threshold lines, with each set of lines for each color having a unique angle to the lines for the other colors. The error diffusion process does not result in objectionable artifacts.