Graphics Reference
In-Depth Information
Figures 3.20 and 3.21 show the R-D performance of Orbi and Interview sequences
respectively at low bitrates up to an overall bitrate of 500 Kbits/s. Both Orbi and Interview
sequences demonstrate better performance for colour and depth image coding than coding
projected left and right view video with scalable H.264/AVC. Due to the characteristics
of depth image sequences, they can be highly compressed using H.264/AVC coding tools
[110].
As a result the coded depth content requires less average bitrate compared to
its corresponding colour image sequence. The coded colour and depth content can be
squeezedintoagiventargetbitratewithlessdegradationincolouranddepthimagequality,
which is vital to render two high quality left and right sequences using DIBR method. In
case of left and right view coding with scalable H.264/AVC, both image sequences require
considerableamountofbitratedue to the availability of similar texture information in both
images. Furthermore, the amount of disparity between the projected left and right images
has hindered the use of adaptive inter-layer prediction more effectively between the base
and enhancement layers of the proposed SVC configuration. Consequently, left and right
view coding has failed to achieve improved quality at low bitrates. However, at higher
bitrates left and right video coding may achieve better performance due to the possibility
of squeezing good quality left and right sequences into a given bitrate.
