Patent ID: 8532187

Claim:
A method of encoding a video signal, comprising: obtaining, by an encoder, a motion vector of a predictive block in a predictive frame; obtaining, by the encoder, a derived vector of an image block of a current frame; generating, by the encoder, a bitstream of a first layer and a bitstream of a second layer, the first layer including a current frame, the second layer including the predictive frame, and the bitstream of the first layer including information regarding the derived vector; wherein the obtaining a derived vector includes, determining, by the encoder, a predictive frame temporally closest to a current frame and a reference frame of the predictive frame, the predictive frame and the reference frame being in the bit stream of the second layer, wherein a temporal position of the current frame is different from the predictive frame and the reference frame, determining, by the encoder, a first temporal difference value between the current frame and the predictive frame, determining, by the encoder, a second temporal difference value between the current frame and reference frame, determining, by the encoder, at least one derived vector based on the motion vector, the first temporal difference value and the second temporal difference value, the derived vector being usable as a motion vector of an image block in the first layer.