Patents by Inventor Stefaan Lippens

Stefaan Lippens 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).

  • Multilevel clustered dot screening method with improved detail and reduced image noise
    Patent number: 8437037
    Abstract: A method and a printing system are described capable of rendering more than 2 density levels at the device pixel level using precalculated rectangular screening tiles of finite size that define a spatially repetitive screening operation according to geometric clustered dot screen definitions for first, second and third separation screens that has the following characteristics: (A) the set of at least three separation screens is free of second order moiré; (B) the set of at least three separation screens consists of screens that have no internal moiré and/or screens that have a reduced sensitivity to amplification by process instability of any remaining level of intrinsic internal moiré; and (C) the screens have an optimized and balanced rosette structure leading to a reduction of visible patterning in overlays of the separation screens.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: May 7, 2013
    Assignee: Xeikon Manufacturing N.V.
    Inventors: Dirk Broddin, Wouter Boeckx, Stefaan Lippens
  • MULTILEVEL CLUSTERED DOT SCREENING METHOD WITH IMPROVED DETAIL AND REDUCED IMAGE NOISE
    Publication number: 20090296122
    Abstract: A method and a printing system are described capable of rendering more than 2 density levels at the device pixel level using precalculated rectangular screening tiles of finite size that define a spatially repetitive screening operation according to geometric clustered dot screen definitions for first, second and third separation screens that has the following characteristics: (A) the set of at least three separation screens is free of second order moiré; (B) the set of at least three separation screens consists of screens that have no internal moiré and/or screens that have a reduced sensitivity to amplification by process instability of any remaining level of intrinsic internal moiré; and (C) the screens have an optimized and balanced rosette structure leading to a reduction of visible patterning in overlays of the separation screens.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 3, 2009
    Inventors: Dirk BRODDIN, Wouter Boeckx, Stefaan Lippens