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Method and apparatus for predictive coding of moving images while adaptively changing the method in accordance with them

  • US 5,418,569 A
  • Filed: 06/09/1993
  • Issued: 05/23/1995
  • Est. Priority Date: 06/10/1992
  • Status: Expired due to Fees
First Claim
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1. A method for encoding a plurality of prediction errors of a group of frames of moving images, comprising the steps of:

  • calculating preliminary prediction errors of an original group of frames arranged in original order, a frame of moving image existing in each of the frames, and each of the preliminary prediction errors being defined as a difference between a frame of moving image actually produced and a frame of moving image predicted;

    accumulating the preliminary prediction errors of the original group of frames to obtain an accumulated value;

    omitting one or more frames from the original group of frames to produce a decimated group of frames arranged in decimated order in cases where the accumulated value is larger than a modified order threshold value Th2 ;

    calculating prediction errors of the decimated group of frames, each of the prediction errors of the decimated group of frames being defined as a difference between a frame of moving image actually produced and a frame of moving image predicted, and the sum of the prediction errors of the decimated group of frames being smaller than the modified order threshold value Th2 ; and

    encoding the prediction errors of the decimated group of frames to produce pieces of output data of which each are composed of a plurality of codes, the amount of the codes of the output data being lower than an upper limit, and the decimated group of frames of moving images being reproduced by decoding the codes of the output data.

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