多视频源组播会话中编码层次映射自适应模型与算法研究

Study on Adaptive Layer Mapping Model and Algorithm in a Multicast Session with Multiple Video Sources

多视频源组播会话是多个视频组播流构成的应用会话 ,它存在于分布视频会议、远程监控、远程教育等应用中 .针对多视频源组播会话中编码层次映射自适应问题 ,已有人提出了多种算法 ,但都缺乏对这个问题的全面、完整的描述 .本文在对多视频源组播会话中编码层次映射自适应模型与算法做全面描述的基础上 ,提出一种新的自适应算法和两个改进算法 ,并从理论上对三种算法进行了评价 .经应用证明 。

A multicast session with multiple video sources is an application session in which there are correlative multiple video multicast streams. It exists in many application systems, such as distributed videoconferencing, remote surveillance system and distance education system, etc.. On adaptive layer mapping problem in a multicast session with multiple video sources, some algorithms have been presented. But these algorithms are not general and complete. In this paper, following the detailed introduction about adaptive layer mapping model and algorithms, we present a new adaptive algorithm and its two improved versions. Next we evaluated these three algorithms in theory. it has been proved that these algorithms have a good practicability through applied.