Combined motion vector and reference index prediction for video coding

摘要

A system and method for improving the coding efficiency of motion vector information in video coding. According to various embodiments, a list of motion vector predictor candidates is arranged according to predefined rules. Each motion vector also has a reference index associated with it. One of the motion vector candidates is then selected as a predictor based on predefined rules, or the selection is explicitly signaled in the bitstream. The reference index associated with the selected motion vector is used as a reference index for the current block. The reference index is predicted along with the motion vector. Such embodiments can improve the compression efficiency of modern video codecs.

主权项

1. A method for encoding an image, comprising:
ordering a plurality of motion vector predictors of a current image block, wherein a rank order of each motion vector predictor of the plurality of motion vector predictors is determined based at least in part on at least one of a coding mode of a block from which the respective motion vector predictor is derived and a reference index of the block from which the respective motion vector predictor is derived; selecting a particular motion vector predictor of the current image block from the plurality of motion vector predictors; and at least selectively providing in an encoded bitstream an indication representative of the rank order of the selected motion vector predictor, wherein each block that has the same reference index as the current image block has a smaller rank order than each block with a reference index different from the reference index of the current image block.