Unequal packet loss resilience for fine-granular-scalability video
Unequal packet loss resilience for fine-granular-scalability video
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DOI：
10.1109/6046.966110
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发表时间：
2001-12
期刊：
影响因子：
--
通讯作者：
M. Schaar;H. Radha
中科院分区：
文献类型：
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作者：
M. Schaar;H. Radha
最近已经为基于IP的多媒体流开发了几种嵌入式视频编码方案。特别是，细粒度可伸缩性(FGS)视频编码最近已被MPEG-4标准采用，作为用于流应用的核心视频压缩方法。从一开始，FGS可伸缩性结构就被设计为具有丢包弹性，特别是在不等丢包保护(UPP)下。然而，自FGS引入以来，还没有一项全面的研究来评估其在互联网流媒体应用中常见的不可恢复的丢包情况下的抗丢包能力。在本文中，我们评估了FGS丢包恢复能力的两个重要方面。首先，我们研究了在基本层和增强层之间应用UPP对基于FGS的流的影响，并比较了同等分组丢失保护(EPP)和UPP场景。其次，我们引入了适用于FGS增强层的细粒度丢失保护(FGLP)的概念，并提出了一个计算FGLP边界的分析框架。基于这些界限，我们展示了对于不同类型的视频序列以及在广泛的码率和丢包率范围内对FGS增强层应用细粒度保护的影响。如我们广泛的仿真结果所示，1)在基本层和增强层之间应用UPP，2)在FGS增强层应用FGLP可以在中到高的丢包率(例如，5%-10%)下提供显著的弹性。此外，这种新的丢包保护技术的优点超过了FGS编码方案，因为FGLP可以成功地应用于提高其他嵌入式视频编码技术的抗丢包能力。
Several embedded video coding schemes have been recently developed for multimedia streaming over IP. In particular, fine-granular-scalability (FGS) video coding has been recently adopted by the MPEG-4 standard as the core video-compression method for streaming applications. From its inception, the FGS scalability structure was designed to be packet-loss resilient especially under unequal packet-loss protection (UPP). However, since the introduction of FGS, there has not been a comprehensive study evaluating its packet-loss resilience under unrecoverable packet losses that are common in Internet streaming applications. In this paper, we evaluate two important aspects of FGS packet-loss resilience. First, we study the impact of applying UPP between the base- and enhancement-layers on FGS-based streams, and we compare equal packet-loss protection (EPP) with UPP scenarios. Second, we introduce the notion of fine-grained loss protection (FGLP), which is suitable for the FGS enhancement-layer, and we develop an analytical framework for evaluating FGLP bounds. Based on these bounds, we show the impact of applying fine-grained protection to the FGS enhancement-layer for different types of video sequences and over a wide range of bit-rates and packet-loss ratios. As illustrated by our extensive simulation results, applying 1) UPP between the base- and enhancement-layers and 2) FGLP for the FGS enhancement-layer can provide significant resilience under moderate-to-high packet-loss ratios (e.g., 5-10%). Furthermore, the merits of this new packet-loss protection technique go beyond the FGS coding scheme, because FGLP can be successfully applied to improve the resilience to packet-losses of other embedded video coding techniques.