Patents by Inventor Patrick William Devaney

Patrick William Devaney 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).

  • Post-filter for removing ringing artifacts of DCT coding
    Patent number: 5819035
    Abstract: A video signal encoding/decoding system reduces ringing noise by using a post-filter which performs anisotropic diffusion on decoded data. The exemplary system uses an encoding/decoding technique such as that developed by the Moving Picture Experts Group (MPEG). The post-filter processes individual blocks of pixels, assigning an individual edge significance threshold to each block. Noise removal occurs if the edge strength is below the threshold and is inhibited if the edge strength is above the threshold.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: October 6, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Patrick William Devaney, Daniel Chandran Gnanaprakasam, Thomas James Leacock