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Hybrid error concealment schemes for broadcast video transmission over ATM networks

机译:通过ATM网络进行广播视频传输的混合错误隐藏方案

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摘要

Two hybrid error concealment schemes based on application of forward error control (FEC) coding in combination with passive error concealment techniques to different layers of coded data in a video transmission system are evaluated. It is shown that use of passive error concealment schemes alone generally does not provide sufficient protection against channel errors, especially in the case of video sequences with significant motion or scene changes. Motivated by these observations, a third hybrid scheme is introduced; this scheme involves adaptive application of FEC codes to high-priority information depending on the level of motion in a sequence. It is shown that through application of this adaptive motion-based scheme, significant savings in bandwidth may be obtained at the expense of only a negligible decrease in reconstructed image quality. Implementation of adaptive motion-based FEC coding in a multiresolution asynchronous transfer mode framework is discussed, and metrics for computing motion in both a subband and an MPEG-2 coding system are introduced.
机译:评估了两种混合错误隐藏方案,这些方案基于前向错误控制(FEC)编码结合无源错误隐藏技术应用于视频传输系统中不同层的编码数据。已经表明,单独使用无源错误隐藏方案通常不能提供足够的针对信道错误的保护,特别是在视频序列具有明显运动或场景变化的情况下。基于这些观察,引入了第三种混合方案。该方案包括根据序列中的运动水平将FEC码自适应地应用于高优先级信息。示出了通过应用这种基于运动的自适应方案,可以以仅可忽略的重建图像质量降低为代价来获得带宽上的显着节省。讨论了在多分辨率异步传输模式框架中基于自适应运动的FEC编码的实现,并介绍了在子带和MPEG-2编码系统中用于计算运动的度量。

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