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Moving-picture coding and decoding method and apparatus with reduced computational cost

  • US 7,027,507 B2
  • Filed: 03/18/2003
  • Issued: 04/11/2006
  • Est. Priority Date: 11/26/1998
  • Status: Expired due to Term
First Claim
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1. A moving-picture decoder for decoding a predictively coded moving-picture signal, comprising:

  • a predictive decoding unit decoding said predictively coded moving-picture signal with reference to a reference picture signal, thereby obtaining an output picture signal;

    a data compressor coupled to said predictive decoding unit, compressively coding said output picture signal, thereby obtaining a compressed picture signal;

    a memory coupled to said data compressor, storing said compressed picture signal; and

    a data decompressor coupled to said memory, expanding said compressed picture signal, thereby obtaining said reference picture signal,wherein said data compressor comprises;

    a block partitioning unit dividing said output picture signal into data blocks;

    a transform processor independently transforming each of said data blocks; and

    a coding unit coding each of the transformed data blocks,wherein said data decompressor comprises;

    a decoding unit decoding each of the coded transformed data blocks, thereby obtaining decoded transformed data blocks;

    an inverse transform processor performing an inverse transform on each of the decoded transformed data blocks to obtain decoded data blocks; and

    a block assembler reassembling the decoded data blocks,wherein said decoding unit performs a dequantizing process that multiplies all data values in said decoded transformed data blocks by a predetermined power of two, then adds an integer bias value centering said data values according to data probability distributions in each quantizing interval.

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