Towards a structure-aware failure semantics for streaming media communication models
Journal of Parallel and Distributed Computing
A scalable video codec for layered video streaming
Real-Time Imaging
Robust video communication for ubiquitous network access
Personal and Ubiquitous Computing
UPC/NPC algorithm for guaranteed QoS in ATM networks
Computer Communications
Issues and technologies for supporting multimedia communications over the Internet
Computer Communications
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Two-layer conditional-replenishment coding of video signals over a variable-bit-rate (VBR) network is described. A slotted-ring network based on an Orwell protocol is assumed, where transmission of certain packets is guaranteed. The two-layer coder produces two output bit streams: the first bit stream contains all the important structural information in the image and is accommodated in the guaranteed capacity of the network, while the second adds the necessary quality finish. The performance of the coder is tested with CIF standard sequences and broadcast-quality pictures. The portion of the VBR channel allocated to the lower layer as guaranteed bandwidth is examined. Using broadcast-quality pictures, statistics were obtained on the performance of this system for different choices of bit rate in the lower layer. The effect of lost packets is shown on CIF standard picture sequences. It is shown that the coder performs well for a guaranteed channel rate as low as 10-20% of the total bit rate