
i
i
i
i
i
i
i
i
5.5 Correlated Motion Estimation with R-D Optimization 101
(x+dx, y+dy)
Forward ME
(x,y)
(x+dx
fwd
, y+dy
fwd
)
(x+dx
bwd
, y+dy
bwd
)
Frame
2
n+1
Frame
2n+2
Frame
2n+2
Forward
ME
Backward
ME
(x,y)
MV (dx,dy)
Frame
2n
Frame
2n
Lower layer
Higher layer
Figure 5.7 Correlation of motion vectors between two adjacent temporal layers.
the absolute value of the forward and the backward motion vectors are equal to the
motion vector of the same MB location in the previous layer. Therefore, one motion
vector can be saved within each forward-backward motion vector pair. An extreme
case of this assumption is that the forward and the backward motion vectors are
equal, while no motion ...