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, 2004
Filed:
Sep. 12, 2000
Yingjun Bai, Rochester, NY (US);
Scott A Bennett, Canandaigua, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
Techniques for black and white pattern rendering that increase processing speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined. The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angle range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.