Chan Yee Sin, Cosman Pamela C, Milstein Laurence B
Verizon Communications, Walnut Creek, CA 92093-0407, USA.
IEEE Trans Image Process. 2008 Aug;17(8):1353-67. doi: 10.1109/TIP.2008.925300.
Motion-compensated fine-granularity scalability (MC-FGS) with leaky prediction has been shown to provide an efficient tradeoff between compression gain and error resilience, facilitating the transmission of video over dynamic channel conditions. In this paper, we propose an n-channel symmetric motion-compensated multiple description (MD) coding and transmission scheme for the delivery of scalable video over orthogonal frequency division multiplexed systems, utilizing the concepts of partial and leaky predictions. We investigate the proposed MD coding and transmission scheme using a cross-layer design perspective. In particular, we construct the symmetric motion-compensated MD codes based on the diversity order of the channel, defined as the ratio of the overall bandwidth of the system to the coherence bandwidth of the channel. We show that knowing the diversity order of a physical channel can assist an MC-FGS video coder in selecting the motion-compensation prediction point, as well as on the use of leaky prediction. More importantly, we illustrate how the side information can reduce the drift management problem associated with the construction of symmetric motion-compensated MD codes. We provide results based on both an information-theoretic approach and simulations.
具有泄漏预测的运动补偿精细粒度可伸缩性（MC-FGS）已被证明能在压缩增益和错误恢复能力之间实现有效权衡，便于在动态信道条件下传输视频。在本文中，我们提出一种用于在正交频分复用系统上传输可伸缩视频的n信道对称运动补偿多描述（MD）编码与传输方案，该方案利用了部分预测和泄漏预测的概念。我们从跨层设计的角度研究所提出的MD编码与传输方案。具体而言，我们基于信道的分集阶数构建对称运动补偿MD码，信道的分集阶数定义为系统总带宽与信道相干带宽之比。我们表明，了解物理信道的分集阶数有助于MC-FGS视频编码器选择运动补偿预测点以及使用泄漏预测。更重要的是，我们说明了边信息如何减少与构建对称运动补偿MD码相关的漂移管理问题。我们基于信息论方法和仿真提供了结果。
