Patents by Inventor John Raitz

John Raitz 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).

  • Harmonic measurement of blockiness in video signals
    Patent number: 6437821
    Abstract: A method of measuring blockiness in a video signal generates a power spectrum for a video field of the video signal. The largest peaks of the power spectrum at the higher frequency end of the power spectrum are initially selected and a common frequency interval between peaks is determined. The contribution to the amplitude of peaks at the common frequency interval by peaks at other than the common frequency interval are subtracted from the amplitude of the peaks at the common frequency interval. The average of the corrected amplitudes of the peaks at the common frequency interval is obtained and normalized as a blockiness metric for the video signal.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: August 20, 2002
    Assignee: Tektronix, Inc.
    Inventors: Bozidar Janko, John Raitz