Graphics Reference
In-Depth Information
The MPEG-4 Multiple Auxiliary Component (MAC) is a generalization of the grayscale
shape coding
[57].
This allows image sequences to be coded with a Video Object Plane
(VOP) on a pixel-by-pixel basis which contains data related to video objects such as
disparity, depth and additional texture. However, this approach needs to send the
grayscale/alphashapewithanyotherauxiliarycomponent(e.g.disparity)and asaresultthe
codingefficiencyisaffected.EventhoughMPEG-4MACissuitabletoencodecolourplus
depthvideoduetothepresenceofgrayscalereducesthecodinggain.Therefore,theperfor-
mance of a modified MPEG-4 MAC coder with no alpha plane is analyzed in this topic in
thelastpartofthischapter.
The multi-view codec developed by JVT can also be utilized in stereoscopic video coding
with inter-view disparity compensation
[46].
However, this method is not applicable for
colour plus depth stereoscopic video due to the availability of different texture information
ineachimagesequence.Consequently,theamountofredundancieswhichcanbeexploited
through inter-layer prediction is minimal. The recent interest on multi-view plus depth
representation may suitable to encode monoscopic video plus depth information
[29].
However, these approaches are developed for interactive multi-view applications such as
free-viewpoint video and may not so effective towards more simple representations like
stereoscopicvideo.
