Patents by Inventor Robert Paul Robideau

Robert Paul Robideau 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 method and hardware architecture
    Patent number: 7627188
    Abstract: A system and method for performing threshold stamping are disclosed. First and second threshold values corresponding to first and second pixels may be retrieved from a threshold memory. A plurality of upscaled threshold values may optionally be computed based on the first threshold value and the second threshold value. An (upscaled) threshold value may be updated at each of one or more first register blocks. A binary pixel value may be computed based at least in part on the first updated threshold value. The first updated threshold value may be updated at each of one or more second register blocks. A downscaled threshold value may optionally be computed based on a plurality of second updated threshold values. The downscaled threshold value or second updated threshold value may be damped in a damping circuit, and the damped threshold value may be stored in the threshold memory.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: December 1, 2009
    Assignee: Xerox Corporation
    Inventors: David Jon Metcalfe, Zhenhuan Wen, Robert Paul Robideau
  • ERROR DIFFUSION METHOD AND HARDWARE ARCHITECTURE
    Publication number: 20090073496
    Abstract: A system and method for performing threshold stamping are disclosed. First and second threshold values corresponding to first and second pixels may be retrieved from a threshold memory. A plurality of upscaled threshold values may optionally be computed based on the first threshold value and the second threshold value. An (upscaled) threshold value may be updated at each of one or more first register blocks. A binary pixel value may be computed based at least in part on the first updated threshold value. The first updated threshold value may be updated at each of one or more second register blocks. A downscaled threshold value may optionally be computed based on a plurality of second updated threshold values. The downscaled threshold value or second updated threshold value may be damped in a damping circuit, and the damped threshold value may be stored in the threshold memory.
    Type: Application
    Filed: November 20, 2008
    Publication date: March 19, 2009
    Applicant: Xerox Corporation
    Inventors: David Jon Metcalfe, Zhenhuan Wen, Robert Paul Robideau
  • Error diffusion method and hardware architecture
    Patent number: 7460727
    Abstract: A system and method for performing threshold stamping are disclosed. First and second threshold values corresponding to first and second pixels may be retrieved from a threshold memory. A plurality of upscaled threshold values may optionally be computed based on the first threshold value and the second threshold value. An (upscaled) threshold value may be updated at each of one or more first register blocks. A binary pixel value may be computed based at least in part on the first updated threshold value. The first updated threshold value may be updated at each of one or more second register blocks. A downscaled threshold value may optionally be computed based on a plurality of second updated threshold values. The downscaled threshold value or second updated threshold value may be damped in a damping circuit, and the damped threshold value may be stored in the threshold memory.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: December 2, 2008
    Assignee: Xerox Corporation
    Inventors: David Jon Metcalfe, Zhenhuan Wen, Robert Paul Robideau