Patent ID: 8902983

Claim:
A method for a decoding device to predict a bi-predictive block of a current picture, the method comprising: deriving, by the decoding device, a first picture order count allocated to a first picture, wherein the first picture is a reference picture of the current picture; deriving, by the decoding device, a second picture order count allocated to the current picture; deriving, by the decoding device, a third picture order count allocated to a second picture; deriving, by the decoding device, a fourth picture order count allocated to a third picture, wherein the second picture is a reference picture of the third picture; scaling, by the decoding device, a motion vector of a block in the third picture based on the first, second, third and fourth picture order counts to obtain a first motion vector for the bi-predictive block; determining, by the decoding device, a first motion-compensated block in the first picture by using the first motion vector; obtaining, by the decoding device, a second motion vector for the bi-predictive block; determining, by the decoding device, a second motion-compensated block by using the second motion vector; obtaining, by the decoding device, first and second weight factors for first and second motion-compensated blocks; and predicting, by the decoding device, the bi-predictive block by applying the first and second weight factors to the first and second motion-compensated blocks, respectively, wherein the first picture order count, the second picture order count, the third picture order count, and the fourth picture order count are values counted in display order.