Patents by Inventor James B. Kuwik

James B. Kuwik 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).

  • Error diffusion for digital printing
    Patent number: 6751358
    Abstract: A system for simulating grayscales in a digital printer, such as an ink-jet printer, exploits a modified error diffusion technique. When a datum for a particular pixel in an image is 0, the datum is substituted with a low-level artificial datum such as 4 on a scale from 0 to 255. The addition of the artificial datum in the error diffusion algorithm avoids artifacts caused by the presence of large number of zeros in the error diffusion algorithm.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: June 15, 2004
    Assignee: Xerox Corporation
    Inventors: David A. Mantell, James B. Kuwik
  • System for resolution enhancement, such as in a multi-pass ink-jet printer
    Patent number: 6411399
    Abstract: In a digital printing apparatus such as an ink-jet printer, a resolution enhancement technique is used to increase the output resolution. Each print-black pixel in the original image is assigned to a set of subpixels in the output image data, and the position of spot placement is rotated among subpixel positions for a series of print-black pixels along a scan line.
    Type: Grant
    Filed: June 21, 1999
    Date of Patent: June 25, 2002
    Assignee: Xerox Corporation
    Inventors: David A. Mantell, James B. Kuwik