Patents by Inventor Paul C. Chen

Paul C. Chen 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).

  • Smooth shading of objects on display devices
    Patent number: 6313840
    Abstract: A method for defining a color gradient across a region in a display space that includes defining a bi-cubic patch enclosing the region. The bi-cubic patch includes four corners having a color associated therewith and four curves connecting pairs of the corners forming a closed loop. The four curves define the color gradient across the bi-cubic patch as a function of the four colors associated with the four corners of the bi-cubic patch. The method includes defining a unit square in parameter space including a mapping function from the unit square to the bi-cubic patch such that the corners of the bi-cubic patch map to the corners of the unit square. The color of every point in the unit square is a bi-cubic interpolation of the four colors associated with the four corners of the bi-cubic patch. The method includes clipping the bi-cubic patch for display of the region.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: November 6, 2001
    Assignee: Adobe Systems Incorporated
    Inventors: William D. Bilodeau, Paul C. Chen, Matthew J. Foley, Stephen N. Schiller