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Figure 3.3: Virtualcollaborationsystemdiagram
Inorder to cope with the heterogeneityofnetworks/terminals anddiverse user preferences,
the currentvideoapplicationsneedtoconsidernotonlycompressionefficiencyandquality
but also the availablebandwidth,memory,computationalpoweranddisplayresolutionsfor
differentterminals.The transcodingmethodsandtheuseofseveralencoderstogeneratediffer-
entresolution(i.e.spatial,temporal or quality) video streams can be used to address the
heterogeneity problem. But above mentioned methodsimposeadditionalconstraintssuch
asunacceptabledelaysandincreasebandwidthrequirements due to redundant data streams.
Scalable video coding is an attractive solution for the issues posed by theheterogeneity
of today's video communications. Scalable coding produces a number of hierarchical
descriptions that provide flexibility in terms of adaptation to user requirements and
network/device characteristics.Thecharacteristicsofthescalablevideocodingconceptcanbe
utilizedtoscaletheexisting 2D video applications into stereoscopic video. For example,
colour and depth video can be coded into twoscalabledescriptorsanddependingonthe
receiverterminalcapabilities,theuserscouldeitherrender stereoscopicvideoorshiftbackto
conventional 2D video [37]. This topic investigates the adaptability of the scalable video
coding concept into backward compatible stereoscopic video applications. Therefore, the
backgroundrelatedtoscalablevideocodingisprovided.
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