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:
Sep. 28, 2004
Filed:
Oct. 31, 2000
Kong Kritayakirana, Sunnyvale, CA (US);
Daniel R Tretter, Palo Alto, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
Methods and apparatus for trapping to prevent a polychromatic printing artifact are described. One method includes the step of selecting a region of a source image comprising a plurality of concentric rings of pixels centered about a selected pixel. Each pixel has a plurality of toner values. Each of the toner values considered for trapping is associated with a non-black color plane. A trapped value is generated for each color plane of the selected pixel. The trapped value for a selected color plane corresponds to the maximum toner value for that color plane within the smallest ring having at least one non-black pixel. A trapped flag for each color plane of the selected pixel is generated. The trapped flag for a selected color plane is enabled only if the selected pixel is black and at least one ring not comprising the selected pixel includes a pixel having a nonzero toner value for the selected color plane. The trapped value is substituted for the corresponding toner value of a given color plane of the selected pixel, if the trapped flag for the given color plane is enabled.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile