Patents by Inventor Jonathan Marshall Thomas Kennedy

Jonathan Marshall Thomas Kennedy 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 compressing digital image data
    Patent number: 6512853
    Abstract: A method for compressing digital image data with greyscale values comprises making at least three predictions of the greyscale value of each pixel and comparing the predicted values with the actual value of the pixel. The difference values between the respective predicted values and the actual value of each pixel is computed, and the median difference value of the three difference values is selected for bit coding. Bit coding is carried out by using variable length bit codes, the shortest length bit code being assigned to the most frequently occurring median difference value. The coded values of the median differences are bit packed, and in the case of a pixel where the absolute median difference value exceeds a predetermined value, the actual pixel value is bit packed.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: January 28, 2003
    Assignee: Barkfort Limited
    Inventors: Jonathan Marshall Thomas Kennedy, Simon Frederick Kennedy, Nicholas Paul Kennedy, David Marshall
  • METHOD AND APPARATUS FOR COMPRESSING DIGITAL IMAGE DATA
    Publication number: 20010028746
    Abstract: A method for compressing digital image data with greyscale values comprises making at least three predictions of the greyscale value of each pixel and comparing the predicted values with the actual value of the pixel. The difference values between the respective predicted values and the actual value of each pixel is computed, and the median difference value of the three difference values is selected for bit coding. Bit coding is carried out by using variable length bit codes, the shortest length bit code being assigned to the most frequently occurring median difference value. The coded values of the median differences are bit packed, and in the case of a pixel where the absolute median difference value exceeds a predetermined value, the actual pixel value is bit packed.
    Type: Application
    Filed: May 18, 1998
    Publication date: October 11, 2001
    Inventors: JONATHAN MARSHALL THOMAS KENNEDY, SIMON FREDERICK KENNEDY, NICHOLAS PAUL KENNEDY, DAVID MARSHALL