Differentiated Protection of Video Layers to Improve Perceived Quality
Differentiated Protection of Video Layers to Improve Perceived Quality
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DOI：
10.1109/tmc.2011.27
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发表时间：
2012-02
影响因子：
7.9
通讯作者：
Kyungtae Kang;W. J. Jeon
中科院分区：
文献类型：
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作者：
Kyungtae Kang;W. J. Jeon
通过网络的可缩放视频传输容易地适应于经历不同网络条件的不同类型的移动的。然而，在易出错的无线环境中的差分视频分组的传输仍然是有问题的。我们提出并分析了一个跨层的错误控制方案，利用优先级感知块交织（PBI）在MAC层的视频广播在CDMA2000系统。PBI方案为保护对视频流的解码更关键的数据分配了更高的优先级，因此对应用层中的图像质量具有更大的影响。在MAC层中结合PBI使用Reed-Solomon编码可以更有效地处理错误突发，如果其实现考虑物理层中的潜在错误分布，并且在应用层中区分不同类型的视频分组。我们还计算了最大抖动的里德-所罗门解码延迟的变化，并确定抖动缓冲区的大小，以防止中断，由于缓冲区欠载。仿真表明，在何种程度上，我们可以提高可伸缩视频的感知质量。
Scalable video transmission over a network is easily adaptable to different types of mobile experiencing different network conditions. However the transmission of differentiated video packets in an error-prone wireless environment remains problematic. We propose and analyze a cross-layer error control scheme that exploits priority-aware block interleaving (PBI) in the MAC layer for video broadcasting in CDMA2000 systems. The PBI scheme allocates a higher priority to protecting the data which are more critical to the decoding of a video stream, and therefore has more effect on picture quality in the application layer. The use of Reed-Solomon coding in conjunction with PBI in the MAC layer can handle error bursts more effectively if its implementation takes account of underlying error distributions in the physical layer, and differentiates between different types of video packets in the application layer. We also calculate the maximum jitter from the variability of the Reed-Solomon decoding delay and determine the size of jitter buffer needed to prevent interruptions due to buffer underrun. Simulations demonstrate the extent to which we can improve the perceived quality of scalable video.