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Summary: 766 IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 7, NO. 4, AUGUST 2005
An Unequal Error Protection Method for
Progressively Transmitted 3-D Models
Ghassan AlRegib, Member, IEEE, Yucel Altunbasak, Senior Member, IEEE, and Jarek Rossignac
Abstract--In this paper, we present a packet-loss resilient
system for the transmission of progressively compressed three-di-
mensional (3-D) models. It is based on a joint source and channel
coding approach that trades off geometry precision for increased
error resiliency to optimize the decoded model quality on the
client side. We derive a theoretical framework for the overall
system by which the channel packet loss behavior and the channel
bandwidth can be directly related to the decoded model quality
at the receiver. First, the 3-D model is progressively compressed
into a base mesh and a number of refinement layers. Then, we
assign optimal forward error correction code rates to protect these
layers according to their importance to the decoded model quality.
Experimental results show that with the proposed unequal error
protection approach, the decoded model quality degrades more
gracefully (compared to either no error protection or equal error
protection methods) as the packet-loss rate increases.
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