Patents Assigned to Klics, Ltd.
  • Patent number: 5661822
    Abstract: A decompression method uses four coefficient inverse perfect reconstruction digital filters. The coefficients of these inverse perfect reconstruction digital filters require a small number of additions to implement thereby enabling rapid decompression in software. The method partially inverse transforms a sub-band decomposition to generate a small low pass component image. This small image is expanded in one dimension by performing interpolation on the rows of the small image and is expanded in a second dimension by replicating rows of the interpolated small image. Transformed chrominance data values may be inverse transformed using inverse perfect reconstruction digital filters having a fewer number of coefficients than the inverse perfect reconstruction digital filters used to inverse transform the corresponding transformed luminance data values.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: August 26, 1997
    Assignees: Klics, Ltd., Media Vision, Inc.
    Inventors: Gregory P. Knowles, Adrian S. Lewis