Patent ID: 9743108
Date: 2017-08-22
CPC Classifications: H04N

Claim:
1. A method for a moving picture coding system to derive at least one motion vector of a bi-predictive block in a current picture from a motion vector of a first block in a first picture, comprising: selecting, by the moving picture coding system, a list 1 motion vector of the first block in the first picture as a motion vector for deriving list 0 and list 1 motion vectors of the bi-predictive block if the first block only has the list 1 motion vector, the first picture being permitted to be located temporally before the current picture and permitted to be located temporally after the current picture; deriving a temporal distance between the current picture and a reference picture of the current picture; scaling the selected motion vector based on the temporal distance; and deriving the list 0 and list 1 motion vectors of the bi-predictive block based on the scaled motion vector.