Patents by Inventor Vincent C. Lung

Vincent C. Lung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Correlated secondary TRC calibration method
    Patent number: 7576893
    Abstract: This invention is a method of producing a set of TRC's for a color printer's secondary halftone screens that is correlated with the printer's primary halftone screens. The method makes use of the printer/screen characteristic data that is normally gathered during screen calibration. However, instead of progressing from the data to a normal calibration for the secondary screens, the method goes backward through the data starting with the finished primary screen TRC's. The method insures that for every primary screen density, the closest possible secondary screen density is used when the same digital value is specified.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: August 18, 2009
    Assignee: Xerox Corporation
    Inventors: Charles M Hains, David E Rumph, Vincent C Lung
  • Correlated secondary TRC calibration method
    Patent number: 7274492
    Abstract: This invention is a method of producing a set of TRC's for a color printer's secondary halftone screens that is correlated with the printer's primary halftone screens. The method makes use of the printer/screen characteristic data that is normally gathered during screen calibration. However, instead of progressing from the data to a normal calibration for the secondary screens, the method goes backward through the data starting with the finished primary screen TRC's. The method insures that for every primary screen density, the closest possible secondary screen density is used when the same digital value is specified.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: September 25, 2007
    Assignee: Xerox Corporation
    Inventors: Charles M. Hains, David E. Rumph, Vincent C. Lung