Patents by Inventor Christine M. Guillemot

Christine M. Guillemot 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).

  • Method and circuit for adjusting the size of a video frame
    Patent number: 5253059
    Abstract: In accordance with the present invention, the number of bits used to code a frame of video is controlled by controlling the frame size. In a preprocessing stage (40) of a video coding circuit (10), each frame of video is processed by a low pass anti-aliasing filter (43,44) in the horizontal and vertical directions. The cutoff frequencies in the horizontal and vertical directions are determined by a desired frame reduction factor in the corresponding direction. Then to reduce the sampling rate in each dimension, each frame of video is processed horizontally and vertically by a shift varying filter (45,46). When the sampling rate in both the horizontal and vertical directions is reduced by M/N, the number of code bits decreases linearly with M/N.
    Type: Grant
    Filed: May 15, 1992
    Date of Patent: October 12, 1993
    Assignees: Bell Communications Research, Inc., France Telecom and Telediffusion de France
    Inventors: Rashid Ansari, Christine M. Guillemot