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Picture decoding method and apparatus

  • US 20020041632A1
  • Filed: 12/13/2000
  • Published: 04/11/2002
  • Est. Priority Date: 12/16/1999
  • Status: Active Grant
First Claim
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1. A picture decoding apparatus for decoding the moving picture information of a second resolution from the compressed picture information of a first resolution obtained on predictive encoding in terms of a pre-set pixel block (macroblock) as a unit and on orthogonal transform in terms of a pre-set pixel block (orthogonal transform block) as a unit, said second resolution being lower than said first resolution, said picture decoding apparatus comprising:

  • inverse orthogonal transform means for inverse orthogonal transforming each coefficient of the orthogonal transform block of the orthogonal transformed compressed picture information;

    addition means for summing the transformed picture information obtained on inverse orthogonal transform by said inverse orthogonal transform means to the motion compensated reference picture information to output said moving picture information of the second resolution;

    storage means for memorizing the moving picture information output by said addition means as the reference picture information;

    first motion compensation means for motion compensating the macroblock of the reference picture information motion-predicted in accordance with the motion prediction system associated with the interlaced scanning (field motion prediction mode); and

    second motion compensation means for motion compensating the macroblock of the reference picture information motion-predicted in accordance with the motion prediction system associated with the sequential scanning (frame motion prediction mode);

    said inverse orthogonal transform means inverse orthogonal transforming four coefficients in the low range in the horizontal direction and eight coefficients in the vertical direction in respective coefficients in an orthogonal transform block of the compressed picture information.

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