Patents by Inventor Christian J. Richard

Christian J. Richard 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 for recording and/or reproducing digitally coded signals with interframe and interframe coding
    Patent number: 4969055
    Abstract: A method for recording and/or reproducing digitally coded video signals. A frame sequence is coded in such a way that an intraframe coded picture having a fixed or variable block length is recorded at the beginning. A fixed number of interframe coded pictures follow. The block length of the interframe coded pictures can be both fixed and variable. A cutting begins with and ends before an intraframe coded picture.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: November 6, 1990
    Inventors: Gunter Oberjatzas, Werner Keesen, Jean-Yves Catros, Christian J. Richard
  • Contrast amplifier for video images
    Patent number: 4654710
    Abstract: A contrast amplifier for video images comprises means for computing a mean value M.sub.g of luminance of all the points of a field, means consisting of a horizontal filter and a vertical filter for computing a local mean value M.sub.v of luminance in the vicinity of a point being processed and means for multiplying the value of luminance of the point during processing by a variable coefficient which is proportional to the ratio M.sub.v /M.sub.g.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: March 31, 1987
    Assignee: Thomson CSF
    Inventor: Christian J. Richard