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Image signal coding system

  • US 5,970,175 A
  • Filed: 10/26/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 10/22/1991
  • Status: Expired due to Term
First Claim
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1. A coding system for digitally encoding a motion video signal comprising:

  • a video memory for storing a previously input signal as field signals obtained by dividing a frame of said previously input signal into a plurality of fields;

    means for outputting at least one of a plurality of predictive signals which predict a change of the input signal to be encoded based on the signals stored in said video memory;

    means for interpolating between at least two of the plurality of predictive signals and for providing an interpolated predictive signal which is different from other predictive signals;

    means, operatively connected to said means for outputting and means for interpolating, for subtracting the interpolated predictive signal from the input signal and producing a predictive error signal therefrom;

    means, responsive to said means for subtracting, for encoding the predictive error signal to develop an encoded predictive error signal;

    means for decoding the encoded predictive error signal to produce a decoded predictive error signal; and

    means for generating a reproduced video signal to be stored in said video memory based on the decoded predictive error signal and the predictive signal.

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