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IMAGE CODING METHOD AND IMAGE DECODING METHOD

  • US 20130251039A1
  • Filed: 04/15/2013
  • Published: 09/26/2013
  • Est. Priority Date: 01/18/2008
  • Status: Active Grant
First Claim
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1. A method for coding image data on a block-by-block basis, said method comprising:

  • partitioning the image data into a plurality of blocks;

    generating a predicted block by predicting a current block that is one of the plurality of blocks;

    computing a difference between the current block and the predicted block;

    coding the difference computed in said computing;

    decoding the difference coded in said coding; and

    adding the difference decoded in said decoding to the predicted block to generate a decoded block,wherein said generating includes;

    detecting a direction of an edge in a previously decoded block corresponding to a block adjacent to the current block, the edge being perpendicular to a gradient of pixel values; and

    extrapolating or interpolating previously decoded image data along the direction of the edge detected in said detecting to generate the predicted block, the previously decoded image data corresponding to a pixel included in the block adjacent to the current block.

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