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Personal and Ubiquitous Computing
Constrained inter prediction: Removing dependencies between different data partitions
ACIVS'07 Proceedings of the 9th international conference on Advanced concepts for intelligent vision systems
Unequal error protection rateless coding for efficient MPEG video transmission
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
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IEEE Transactions on Information Theory - Part 1
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IEEE Transactions on Information Theory
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Personal and Ubiquitous Computing
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Ubiquitous network access implies that video can be streamed to portable devices whether they are moving outdoors or docked at home. Unfortunately, broadband wireless channels and their wired alternatives present a hostile environment for video communication, which manifests itself in error bursts. This paper presents a robust application layer, channel-coding scheme suitable for data-partitioned, compressed video. Data partitioning prioritizes the more important data within a compressed bitstream. In the scheme, the more important compressed data are protected prior to communication over an access network. In particular, window-growth rateless codes are used. This form of rateless code can be incrementally scaled to reflect the importance of the data being protected. The paper gives details of the scheme for achieving this in the context of an H.264/AVC codec's picture types and structures. The paper considers how best to apply the scheme to H.264/AVC's data-partitioning modes in a practical manner. Simulations of error-prone channels show that the proposed unequal protection scheme achieves several dBs of improvement in video quality, when compared with equal protection. The simulations modeled both wireless and wired access networks.