| 摘要 |
<p>An image area to encode belongs to a first group of image areas that are to be encoded into an encoding unit which can be decoded independently of any other encoding unit. An encoding method comprises determining a first set of motion vector predictors for the image area to encode from motion vectors that are associated with other image areas belonging to the first group of image areas. A second set of motion vector predictors for the image area to encode is determined from motion vectors that are associated with image areas belonging to one or more further groups of image areas different from said first group of image areas and that are encoded into one or more further encoding units. The number of predictors in the second set is obtainable by a decoder even if at least one of the further encoding units is lost. A motion vector predictor is selected from among the motion vector predictors of the first and second sets, and information representative of the selected motion vector predictor is encoded in dependence upon the number of motion vector predictors in the first and second sets. Such a method enables the second set of predictors to be used to improve the coding efficiency but, in the event that one of the further encoding units is lost, the number of second-set predictors is still obtainable by the decoder. This avoids parsing problems on the decoder side.</p> |
