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High-efficiency coding method, high-efficiency coding apparatus, recording and reproducing apparatus, and information transmission system

  • US 5,818,968 A
  • Filed: 03/19/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 03/20/1995
  • Status: Expired due to Fees
First Claim
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1. A high-efficiency coding method comprising the steps of:

  • a block-dividing step for dividing image information extracted from a predetermined area of a preceding frame to provide a plurality of reference block of a predetermined unit at every frame;

    a difference absolute value sum calculation step for calculating a difference absolute value sum of pixel data located within said plurality of reference blocks and pixel data located within a remarkable block extracted from a present frame;

    a first motion detection step for obtaining first motion vector data based on first difference absolute value sum data of minimum value from a plurality of difference absolute value sum data provided at every plurality of reference blocks;

    a second motion detection step for obtaining second motion vector data based on second difference absolute value sum data of minimum value from a plurality of difference absolute value sum data provided at every plurality of reference blocks corresponding to one field located within said plurality of reference blocks;

    a comparison step for comparing said first difference absolute value sum data and said second difference absolute value sum data;

    a selection step for selecting said first motion vector data or said second motion vector data based on a compared result of said comparison step;

    a motion compensation step for motion-compensating image information of said preceding frame based on said first motion vector data or said second motion vector data; and

    an encoding step for effecting encoding by calculating a difference between said image information of present frame and said motion-compensated image information of preceding frame.

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