Patents by Inventor Shmuel Windgrad

Shmuel Windgrad 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 apparatus for watermarking with no perceptible trace
    Patent number: 6564322
    Abstract: A watermark in the form of an added message is attached to a digital recording so that a significant content of the recording is completely unchanged by the process in the sense that any reader commonly used for such recording will extract from the recording exactly what would have been extracted in the case the added message had not been attached. This is done by hiding the added message in the error correcting code (ECC) for the significant content of the recording.
    Type: Grant
    Filed: January 26, 1999
    Date of Patent: May 13, 2003
    Assignee: International Business Machines Corporation
    Inventors: David H. Jameson, Charles P. Tresser, Chai W. Wu, Steven R. Abrams, Shmuel Windgrad