| 摘要 |
Motion vectors encode for differences between segments of a reference frame and pixels of a current frame being encoded when the current frame is a nonkey frame. The motion vectors are encoded by grouping one or more segments of the frame into a group of segments, generating a group motion vector for the group of segments and one or more local motion vectors, wherein a local motion vector corresponds to a segment in the one or more segments and specifies a change for the segment relative to the motion vector for the group of segments and encoding the motion vector and one or more local motion vectors. The group motion vector can be determined based on a relationship between the motion vectors for the one or more segments. The grouping can be hierarchical. The motion vectors can represent translation, z-ordering, deformation, and/or lighting data.
|
