Patents by Inventor Angela Ruth Murphy

Angela Ruth Murphy 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).

  • Detecting errors in video images
    Patent number: 5745169
    Abstract: An error is identified in a video image by calculating frequency-related coefficients for blocks of the image and considering the statistical distribution of said coefficients. The variance of the coefficients is calculated and a block of original image data is concealed if the variance calculated is significantly higher than a stored threshold and/or if said variance calculated is significantly different from variance values derived for similarly positioned blocks within a previous frame. Concealment is effected by selecting image data from a previous frame, displaced in response to transmitted motion vectors.
    Type: Grant
    Filed: January 18, 1996
    Date of Patent: April 28, 1998
    Assignee: British Telecommunications public limited company
    Inventors: Angela Ruth Murphy, Stephen Richard Gunby