Method and apparatus for deriving temporal motion vector prediction

摘要

A method and apparatus for deriving a temporal motion vector predictor (MVP) are disclosed. The MVP is derived for a current block of a current picture in Inter, or Merge, or Skip mode based on co-located reference blocks of a co-located block and a flag is used to indicate the co-located picture. More than one co-located reference blocks can be used to derive the temporal MVP and the co-located reference blocks can be selected from the co-located block as well as neighboring blocks of the co- located block. A search set comprises search motion vectors associated with the co-located reference block(s) is formed. The search motion vector (MV) corresponding to the co-located reference block in the same reference list is searched before the search MV in a different reference list. In another embodiment, the search MV crossing the current picture is searched before other search MV(s). If the search finds two motion vectors crossing the current picture or no motion vector crossing the current picture, the MV corresponding to the co-located reference block in the same reference list is searched before the search MV in a different reference list. If no MVP is found, the search continues over other search MV(s). Various schemes to accommodate implicit method of deriving co-located picture are also disclosed.