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Encoding apparatus in which flat subblocks are identified in blocks of a motion signal prior to coding the blocks and complementary decoding apparatus

  • US 5,510,841 A
  • Filed: 08/05/1994
  • Issued: 04/23/1996
  • Est. Priority Date: 09/20/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for compressing a motion picture signal to generate a compressed signal, the motion picture signal including pixel data, and being divided into blocks, the apparatus comprising:

  • flat subblock judging means for segmenting each of the blocks of the motion picture signal into subblocks, for determining whether the pixel data of the motion picture signal in each of the subblocks have a variation that is small, and for generating flatness information indicating whether each of the subblocks is one of a flat subblock and an unflat subblock, the flat subblock being one of the subblocks wherein the pixel data of the motion picture signal have a variation that is small;

    folding means, operating in response to the flatness information generated by the flat subblock judging means, for modifying the blocks of the motion picture signal to generate respective blocks of a folded signal, the folding means folding the motion picture signal in a first one of the subblocks in each one of the blocks of the motion picture signal with the motion picture signal in a second one of the subblocks in the one of the blocks of the motion picture signal, the flatness information indicating the first one of the subblocks to be an unflat subblock and the second one of the subblocks to be a flat subblock;

    coding means, operating in response to the flatness information generated by the flat subblock judging means, for coding the blocks of the motion picture signal to generate respective blocks of a coded picture signal, each of the blocks of the motion picture signal being coded in a manner determined by the flatness information; and

    multiplexing means for multiplexing the flatness information generated by the flat subblock judging means and the blocks of the coded picture signal generated by the coding means to generate the compressed signal.

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