Patents by Inventor Robert P. Robideau

Robert P. 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).

  • Scan image processing
    Patent number: 5282053
    Abstract: The method of scanning a document by providing a test patch to be scanned, initially scanning the test patch and storing the signal response of each reading element to the test patch in a pixel threshold table, providing a document to be scanned, scanning the document and comparing the signal response of each reading element with the corresponding signal response in the pixel threshold table, and printing a mark or not printing a mark in response to the comparison for each reading element. The method includes an extended threshold table to cover halftone cells.
    Type: Grant
    Filed: October 23, 1991
    Date of Patent: January 25, 1994
    Assignee: Xerox Corporation
    Inventor: Robert P. Robideau
  • Vertical line width control ionographic system
    Patent number: 5081475
    Abstract: A device for the adjustment of the digital data stream that drives the modulators in an ionographic printing device. In particular, the device stretches strings of black image pixels to produce wider vertical lines and other fine details that may have been adversely affected due to modulator crosstalk. Moreover, the present invention is implemented in such a manner, so as to enable the end user to selectively define the magnitude of stretching to be applied to the strings of black pixels.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventors: John A. Frank, Brendan C. Casey, Robert P. Robideau