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 motion compensated prediction interframe encoding on a to-be-encoded macroblock of a video picture by using a plurality of reference pictures and a motion vector between the to-be-encoded macroblock and at least one reference picture, the method comprising: 
 extracting a plurality of reference macroblocks from a plurality of reference pictures in accordance with information of the motion vector;    calculating distances between the plurality of reference pictures and the to-be-encoded picture;    generating a predictive macroblock by calculating a linear sum of the plurality of extracted reference macroblocks using weighting factors determined in accordance with the calculated distances;    generating a predictive error signal between the predictive macroblock and the to-be-encoded macroblock; and    encoding to-be-encoded data including the predictive error signal, a first index indicating the plurality of reference pictures, a second index indicating the number of a to-be-encoded picture, and information of the motion vector.    
   
   
       2 . A video encoding apparatus configured to perform motion compensated prediction interframe encoding on a to-be-encoded macroblock of a video picture by using a plurality of reference pictures and a motion vector between the to-be-encoded macroblock and at least one reference picture, the apparatus comprising: 
 an extracting unit configured to extract a plurality of reference macroblocks from a plurality of reference pictures in accordance with information of the motion vector;    a calculator configured to calculate distances between the plurality of reference pictures and the to-be-encoded picture;    a first generator configured to generate a predictive macroblock by calculating a linear sum of the plurality of extracted reference macroblocks using weighting factors determined in accordance with the calculated distances;    a second generator configured to generate a predictive error signal between the predictive macroblock and the to-be-encoded macroblock; and    an encoder configured to encode to-be-encoded data including the predictive error signal, a first index indicating the plurality of reference pictures, a second index indicating the number of a to-be-encoded picture, and information of the motion vector.