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首页> 外文期刊>Journal of visual communication & image representation >Layered H.264 video transmission with hierarchical QAM
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Layered H.264 video transmission with hierarchical QAM

机译：具有分层QAM的分层H.264视频传输

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摘要

In multimedia communication systems, channel bandwidth and probability of error are the two main limitations that affect the quality of service. Therefore, in applications such as video over mobile networks, a video codec should cope with the erroneous situations of the channel as well as the bandwidth limitation. There are several techniques to make a video bitstream robust to the channel error. Layered video coding in conjunction with unequal error protection is a common method that provides error resilience. Hierarchical quadratic amplitude modulation is an efficient method that provides the unequal priority control for communication channels without adding any redundancy to the transmitted data. To generate the layers in the H.264/AVC video coding standard, the data partitioning technique has been included. Scalability is another efficient layering technique that is not entirely supported in the current specification of H.264/AVC. This paper proposes an SNR scalable scheme to adapt to the H.264/AVC codec. It contains new features that make it more efficient than the previous SNR scalable codecs. In this paper applying unequal error protection by hierarchical coding to both scalable and data partitioned bitstreams is analyzed. Simulation results show that the scalable scheme is more successful in conjunction with unequal error protection.
机译：在多媒体通信系统中，信道带宽和错误概率是影响服务质量的两个主要限制。因此，在诸如移动网络上的视频之类的应用中，视频编解码器应能够应对信道的错误情况以及带宽限制。有几种技术可使视频比特流对信道错误具有鲁棒性。分层视频编码结合不平等的错误保护是一种提供错误恢复能力的常用方法。分层二次振幅调制是一种有效的方法，它为通信信道提供了不相等的优先级控制，而不会给传输的数据增加任何冗余。为了生成H.264 / AVC视频编码标准中的层，已包括数据分区技术。可伸缩性是另一种有效的分层技术，在H.264 / AVC的当前规范中并未完全支持。本文提出了一种适用于H.264 / AVC编解码器的SNR可扩展方案。它包含的新功能使其比以前的SNR可伸缩编解码器更高效。在本文中，分析了通过分级编码将不平等的错误保护应用于可伸缩和数据分区的比特流。仿真结果表明，可扩展方案与不平等的错误保护相结合更为成功。

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