
i
i
i
i
i
i
i
i
96 5 Motion Threading for 3D Wavelet Coding
Figure 5.3 Lifting-based MT with bidirectional motion search.
and MT
2i+1,2i+2
() as follows:
MT
2i+1,2i
(x) = x + MV
2i+1,2i
(x)
MT
2i+1,2i+2
(x) = x + MV
2i+1,2i+2
(x)
, (5.3)
where MV
2i+1,2i
(x) and MV
2i+1,2i+2
(x) are the motion vectors of the pixel x in the
frame 2i + 1. In the proposed scheme, MV
2i+1,2i
(x) and MV
2i+1,2i+2
(x) are allowed
to point out a noninteger pixel. F
2i
(MV
2i+1,2i
(x)) and F
2i+2
(MV
2i+1,2i+2
(x)) in the
fractional-pixel position are calculated with Sinc interpolation [82].
The second equation in Eq. (5.2) describes the update step. Obviously, the update
step needs the motion alignment MT
−