Patent ID: 7233621
Filing Date: 2007-06-19
Classification: H04N

Abstract:
1. A method of deriving motion vectors of a bi-predictive block in a current picture from a motion vector of a co-located block in a reference picture, comprising: selecting a list 1 motion vector of the co-located block in a first list 1 reference picture as the motion vector for deriving list 0 and list 1 motion vectors of the bi-predictive block, if the co-located block only has the list 1 motion vector, the first list 1 reference picture being a type of reference picture permitted to be located temporally before or after the current picture, and the selected list 1 motion vector pointing to a second list 1 reference picture which is a reference picture of the first list 1 reference picture; and deriving the list 0 and list 1 motion vectors of the bi-predictive block based on the selected list 1 motion vector of the co-located block.