Method of deriving a motion vector of a bi-predictive block based on temporal distances associated with a co-located block in a reference picture

摘要

In one embodiment, the method includes selecting one motion vector of the co-located block in a first reference picture as the motion vector for deriving the motion vector of the bi-predictive block. A first temporal distance is derived from a difference between a current picture and a first reference picture. The current picture includes the bi-predictive block. A second temporal distance is derived from a difference between the first reference picture and a second reference picture. The selected motion vector is scaled based on the first and second temporal distances, and the motion vector of the bi-predictive block is derived based on the scaled motion vector.