Video encoding method and apparatus and video decoding method and apparatus
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 decoding method of performing a motion compensated prediction interframe decoding on an encoded video macroblock of an encoded video frame, using a plurality of reference frames and a motion vector between the encoded video macroblock and at least one of the reference frames, the method comprising:
decoding encoded data including a prediction error signal for the encoded video macroblock, a first index indicating the plurality of reference frames, a second index indicating the number of the encoded video frame, and the motion vector;
extracting a plurality of reference macroblocks from the plurality of reference frames according to the decoded motion vector and the decoded first index;
computing a distance between the plurality of reference frames and the encoded video frame according to the decoded second index;
computing a linear sum of the reference macroblocks, using weighting factors determined according to the calculated distance, to generate a predictive macroblock; and
adding the predictive macroblock and the prediction error signal every encoded video macroblock to reconstruct a video picture.
2. A video decoding apparatus of performing a motion compensated prediction interframe decoding on an encoded video macro lock of an encoded video frame, using a plurality of reference frames and a motion vector between the encoded video macroblock and at least one of the reference frames, the apparatus comprising:
a decoder to decode encoded data including a prediction error signal for the encoded video macroblock, a first index indicating the plurality of reference frames, a second index indicating the number of the encoded video frame, and the motion vector;
an extractor to extract a plurality of reference macroblocks from the plurality of reference frames according to the decoded motion vector and the decoded first index;
a calculator to calculate a distance between the plurality of reference frames and the encoded video frame according to the decoded second index;
a calculator to calculate a linear sum of the reference macroblocks, using weighting factors determined according to the calculated distance, to generate a predictive macroblock; and
an adder to add the predictive macroblock and the prediction error signal every encoded video macroblock to reconstruct a video picture.