The Research On Transport Allocation Optimazation Of FGS Video

With the fast development of Internet technology, it is possible for people to catch real-time image and video from networks. It is called the streaming media. However the some of the existing problems of Internet, such as heterogeneity, network bandwidth, transport delay, give new challenges to the research of video coding and video trasmission technology.This paper mainly pays attention on scalable coding, especially Fine Granularity Scalability (FGS) coding and the problems of FGS transmission. Major work and contribution could be described as follows.Firstly, this paper introduces the related knowledges on scalable coding methods. The knowledges include the basic modes of scalability coding, which include SNR, spatial, temporal, and hybrid scalability modes. Then the paper emphasizes FGS and PFGS (Progressive Fine Granulrity Scalability) coding methods, which are proposed in recent years.Secondly, the paper relatively analyses the "Equal Slope" characteristic of FGS Rate-Distortion (R-D) relation function. Then it advances rate allocation problems for static networks and dynamic networks. On static networks, it advances static algorithm for rate allocation using two-division method, which afford basic knowledge for Slide-Window-Shortest-Path algorithm on dynamic networks. And on dynamic networks, the paper advances Slide-Window-Shortest-Path algorithm for transmission-rate allocation. The Slide-Window-Shortest-Path algorithm for dymamic networks largely enhances the efficiency of allocation algorithm and smoothes the video quality at the same time. Theory analysis demonstrates that the algorithm can get better efficient.Thirdly, the paper puts up emulational experiments for FGS video transmission in isomorphic networks using OPNET tools. And it analyses the experiment results. Then it simply establishes a simulant transport system of FGS video in the isomerous networks. And it achieves the application of the Slide-Window-Shortest-Path algorithm for transmission rate allocation in the system. Emluator experiment results demonstrate that the algorithm can achieve better effect on transmitting FGS video with adaptive network bandwidth and smooth video quality.