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Image-signal decoding apparatus

  • US 5,479,211 A
  • Filed: 04/29/1993
  • Issued: 12/26/1995
  • Est. Priority Date: 04/30/1992
  • Status: Expired due to Term
First Claim
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1. An image signal decoding apparatus for decoding moving-picture data compressed per block by orthogonal transform, quantization and variable-length coding for each block, said apparatus comprising:

  • variable-length code decoding means for decoding the compressed moving-picture data, and for outputting the decoded moving-picture data, a moving vector per block, and information on block type;

    distortion-eliminating means for eliminating a block distortion for moving-picture data decoded by said variable-length code decoding means, according to a distortion elimination characteristic of said distortion-eliminating means;

    judging means for obtaining a signal band for each block from the decoded moving-picture data, and for changing the distortion elimination characteristic of said distortion-eliminating means for each block on the basis of at least one of the signal band, the moving vector for each block and the information on block type;

    said judging means comprising;

    threshold-comparing means for comparing the decoded moving-picture data from said variable-length code decoding means with a predetermined threshold value, and for outputting a comparison result of the comparison between the decoded moving-picture data and the threshold value;

    maximum frequency-judging means for computing a maximum frequency in at least one of a horizontal and a vertical direction from the comparison result; and

    filter-determining means for determining at least one of kernel sizes and coefficients of at least one of horizontal and vertical filters on the basis of at least one of the maximum frequency in the horizontal and/or vertical directions, the moving vector and the information on block type.

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