Cryptography Reference
In-Depth Information
Video
Core Encoder
Tr ansfo rm /
Ent. Coding
(SN R Scala ble )
Intra prediction
for in tr a blo ck
B itstr eam
5/3 MCTF
Texture
Motion {M
p
2
}
Multipl ex
M otion Codi ng
2D Sp atia l
Interpolation
2D Spatial
Decimation
De cod ed Fra mes {L
1
}
Motion
Tr ansfo rm /
Ent. Coding
(S NR S cal abl e)
In tra pr edi cti on
for intra block
5/3 MCTF
Texture
Motion {M
p
1
}
M otion Codi ng
2D Spatial
Interpolation
De code d Fra mes {L
0
}
Motion
Tr ansfo rm /
Ent. Coding
(S NR S cal abl e)
Intra prediction
for in tr a blo ck
5/3 MCTF
Texture
Motion { M
p
0
}
M otion Codi ng
Fig. 3.3.
Encoder block diagram of the AVC-based SVC scheme [3].
3.2 Scalable Extension of AVC/H.264
In order to simultaneously support spatial, temporal and SNR scalability, a
scalable version of AVC/H.264 was proposed [3]. Fig. 3.3 shows the encoder
structure of the AVC-based scheme. To facilitate the spatial scalability, the
input video is decimated into spatial resolutions. The sequence in each spa-
tial resolution is coded as a separated layer using AVC/H.264. Within each
spatial layer, Motion Compensated Temporal Filtering (MCTF) is employed
in every Group Of Pictures (GOPs) to provide the temporal scalability. In
order, to remove redundancy existing among spatial layers, a considerable
degree of inter-layer prediction is incorporated. The residual frames existing
after the inter-layer prediction are then transformed and successively quan-
tized for SNR scalability. In the following subsections, we elaborate the details
for each dimension of scalability.
