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Intra compression of pixel blocks using predicted mean

  • US 6,571,016 B1
  • Filed: 05/05/1997
  • Issued: 05/27/2003
  • Est. Priority Date: 05/05/1997
  • Status: Expired due to Term
First Claim
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1. A method for encoding a video frame to be transmitted over a communications medium, the method comprising the steps of:

  • obtaining a video frame;

    separating the frame into a plurality of blocks;

    encoding a plurality of blocks using inter compression;

    encoding the plurality of blocks using predictive intra compression;

    selecting better block compression between said steps of inter compression and intra compression for the plurality of blocks;

    wherein said steps of encoding of the plurality of blocks is performed on a block by block basis, to provide optimum compression of the video frame for a given bit rate; and

    wherein predictive intra compression comprises the steps of;

    obtaining pixel values that are adjacent to a first block in the plurality of blocks;

    predicting pixel values for the first block in the plurality of blocks from the obtained adjacent pixel values;

    calculating a distance between the predicted pixal values and the actual pixel values for the first block in the plurality of blocks;

    creating a residual from the calculated distance; and

    encoding the residual.

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