Video encoding method and apparatus and video decoding method and apparatus

Abstract

A video encoding method includes extracting at least one reference macroblock from each of a plurality of reference frames to generate a plurality of reference macroblocks, computing a linear sum of the reference macroblocks using weighting factors to generate a predictive macroblock, generating a motion vector between the video macroblock and the reference macroblock corresponding to the predictive macroblock, generating a prediction error signal between the predictive macroblock and the video macroblock, and encoding the prediction error signal, a first index indicating the plurality of reference frames, a second index indicating the weighting factors and the motion vector.

1 . A video encoding method of performing a motion compensated prediction interframe encoding on a video macroblock of a video picture, using a plurality of reference pictures and a motion vector between the video macroblock and at least one reference picture, the method comprising: 
 determining at least one weighting factor and at least one DC offset value;    calculating a linear sum of a plurality of reference blocks extracted from the reference picture using weighting factors;    adding the linear sum and the DC offset value to generate a prediction block;    generating a prediction error signal between the prediction block and the video block; and    encoding information items indicating the prediction error signal, the reference picture, the weighting factor, the DC offset value and the motion vector.    
   
   
       2 . A video encoding apparatus configured to perform a motion compensated prediction interframe encoding on a video macroblock of a video picture, using a plurality of reference pictures and a motion vector between the video macroblock and at least one reference picture, the apparatus comprising: 
 a determining unit configured to determine at least one weighting factor and at least one DC offset value;    a calculator configured to calculate a linear sum of a plurality of reference blocks extracted from the reference picture using weighting factors;    an adder configured to add the linear sum and the DC offset value to generate a prediction block;    a generator configured to generate a prediction error signal between the prediction block and the video block; and    an encoder configured to encode information items indicating the prediction error signal, the reference picture, the weighting factor, the DC offset value and the motion vector.