基于NS-2平台的立体视频传输仿真技术及其应用
发布时间：2018-07-13 09:35
【摘要】：网络模拟的原理就是编写一定的计算机程序,以模型模拟网络,即通过程序来模拟网络的运行。网络模拟是当前研究网络技术的一种常用手段。在研究立体视频传输技术时,考虑到实际的网络传输平台构建代价过大,所以,选择合适的网络模拟器进行仿真研究是有必要的,也是可行的,而且模拟器可以方便地进行测试、评估和验证。网络模拟的周期小,成本也很低,在进行重复试验的同时不用担心产生额外负担,而且可以使研究者更容易借用他人的研究成果,然后在此基础上致力于研究自己的课题。网络模拟有许多其它手段不具备的优点,例如,新型的网络协议、应用、服务、控制算法等可以先通过网络模拟预测和评估其性能,达到期望后再应用到现实系统。目前,使用频率较高的网络模拟仿真平台主要有Matlab,NS-2,Opent等,NS-2有着源代码公开、免费等其它平台不具备的优点,这些优点可以帮助研究人员很容易地获取并使用NS-2进行研究或开发。自诞生至今,NS-2的框架也日趋完善,基本涵盖了对应实际网络技术的各个模块。在研究立体视频流的传输仿真之前需要借助NS-2构建合适的网络仿真拓扑结构,之后在拓扑结构基础上构建出适合立体视频传输的仿真平台。构建的网络仿真拓扑结构的性能会直接影响到立体视频传输仿真的效果,所以在构建网络拓扑时需要对其性能进行仿真测试,如测试传输延时、吞吐量、抖动等性能参数,从而不断调整拓扑结构,使得能较好地适用于立体视频传输。目前,多数针对传输进行的仿真研究,都未涉及到立体视频,而研究单通道视频传输仿真也都未考虑视频本身的特性,只单独进行视频数据的传输仿真,对于传输过程中出现的延时过大等问题没有做更深入的研究。本文在进行立体视频传输仿真技术的研究时,首先充分考虑立体视频的特性,如GOP中各帧的重要性都不同,并针对这些特性进行更深入的研究,有效区分出帧的重要性等级;然后在重要性等级的基础上研究了拥塞控制策略,能有效保护重要性高的数据,从而有效提高解码端立体视频的质量。本文的主要工作如下:第一,对网络模拟器NS-2的仿真原理进行了研究,在Windows xp环境下构建NS-2平台,并对其进行扩展研究,从而搭建立体视频传输仿真系统;第二,研究NS-2下有线和无线仿真的特征和区别,分别构建基于802.11无线网络仿真拓扑系统和IP网络仿真拓扑系统,并实现SVC传输仿真;第三,在IP网络环境下,研究基于内容的立体视频传输仿真的实现,在此基础上提出一种适用于立体视频传输的网络拥塞控制技术。通过仿真实验证明,本文所提出的立体视频帧重要性区分方法能快速区分出GOP中各帧的重要性等级,在此基础上进行的网络拥塞控制策略能有效保护重要的数据部分,从而提高解码视频的质量。
[Abstract]:The principle of network simulation is to write a certain computer program to model the network, that is, to simulate the operation of the network through the program. Network simulation is a common method to study network technology. When studying stereo video transmission technology, it is necessary and feasible to select a suitable network simulator for simulation research, considering that the construction cost of the actual network transmission platform is too high. Moreover, the simulator can be easily tested, evaluated and verified. The cycle of network simulation is small and the cost is very low. It is easy for researchers to borrow the research results of others and to study their own subjects on the basis of repeated experiments without worrying about extra burden. Network simulation has many advantages, such as new network protocols, applications, services, control algorithms and so on, which can be predicted and evaluated by network simulation, and then applied to real systems. At present, the network simulation platform with high frequency mainly has the advantages of open source code, free and other platforms. These advantages can help researchers to obtain and use NS-2 for research or development easily. The framework of NS-2 has been improved from birth to now, covering all modules corresponding to the actual network technology. Before studying the transmission simulation of stereoscopic video stream, we need to construct an appropriate network simulation topology with NS-2, and then construct a simulation platform suitable for stereo video transmission on the basis of topology structure. The performance of the network simulation topology will directly affect the effect of stereo video transmission simulation, so the performance of the network topology needs to be simulated and tested, such as transmission delay, throughput, jitter and other performance parameters. Thus, the topology can be adjusted to make it more suitable for stereo video transmission. At present, most simulation studies on transmission do not involve stereoscopic video, and the simulation of single channel video transmission does not consider the characteristics of video itself, and only carries out the simulation of video data transmission alone. No further research has been done on the problem of excessive delay in the transmission process. In this paper, in the research of stereo video transmission simulation technology, the characteristics of stereo video are considered, such as the importance of each frame in GOP is different, and in view of these characteristics, the importance level of frame can be effectively distinguished. Then the congestion control strategy is studied on the basis of importance level, which can effectively protect the data of high importance and improve the quality of stereo video. The main work of this paper is as follows: first, the simulation principle of network simulator NS-2 is studied, and the NS-2 platform is constructed under Windows XP environment, and the extended research is carried out to build a stereo video transmission simulation system. The characteristics and differences of wired and wireless simulation under NS-2 are studied. The topology system based on 802.11 wireless network simulation and IP network simulation topology are constructed, and the transmission simulation of SVC is realized. Thirdly, in the IP network environment, The realization of stereo video transmission simulation based on content is studied, and a network congestion control technology for stereo video transmission is proposed. The simulation results show that the method proposed in this paper can quickly distinguish the importance of each frame in GOP, and the congestion control strategy based on this method can effectively protect the important data part. In order to improve the quality of decoded video.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.8
本文编号：2118932
[Abstract]:The principle of network simulation is to write a certain computer program to model the network, that is, to simulate the operation of the network through the program. Network simulation is a common method to study network technology. When studying stereo video transmission technology, it is necessary and feasible to select a suitable network simulator for simulation research, considering that the construction cost of the actual network transmission platform is too high. Moreover, the simulator can be easily tested, evaluated and verified. The cycle of network simulation is small and the cost is very low. It is easy for researchers to borrow the research results of others and to study their own subjects on the basis of repeated experiments without worrying about extra burden. Network simulation has many advantages, such as new network protocols, applications, services, control algorithms and so on, which can be predicted and evaluated by network simulation, and then applied to real systems. At present, the network simulation platform with high frequency mainly has the advantages of open source code, free and other platforms. These advantages can help researchers to obtain and use NS-2 for research or development easily. The framework of NS-2 has been improved from birth to now, covering all modules corresponding to the actual network technology. Before studying the transmission simulation of stereoscopic video stream, we need to construct an appropriate network simulation topology with NS-2, and then construct a simulation platform suitable for stereo video transmission on the basis of topology structure. The performance of the network simulation topology will directly affect the effect of stereo video transmission simulation, so the performance of the network topology needs to be simulated and tested, such as transmission delay, throughput, jitter and other performance parameters. Thus, the topology can be adjusted to make it more suitable for stereo video transmission. At present, most simulation studies on transmission do not involve stereoscopic video, and the simulation of single channel video transmission does not consider the characteristics of video itself, and only carries out the simulation of video data transmission alone. No further research has been done on the problem of excessive delay in the transmission process. In this paper, in the research of stereo video transmission simulation technology, the characteristics of stereo video are considered, such as the importance of each frame in GOP is different, and in view of these characteristics, the importance level of frame can be effectively distinguished. Then the congestion control strategy is studied on the basis of importance level, which can effectively protect the data of high importance and improve the quality of stereo video. The main work of this paper is as follows: first, the simulation principle of network simulator NS-2 is studied, and the NS-2 platform is constructed under Windows XP environment, and the extended research is carried out to build a stereo video transmission simulation system. The characteristics and differences of wired and wireless simulation under NS-2 are studied. The topology system based on 802.11 wireless network simulation and IP network simulation topology are constructed, and the transmission simulation of SVC is realized. Thirdly, in the IP network environment, The realization of stereo video transmission simulation based on content is studied, and a network congestion control technology for stereo video transmission is proposed. The simulation results show that the method proposed in this paper can quickly distinguish the importance of each frame in GOP, and the congestion control strategy based on this method can effectively protect the important data part. In order to improve the quality of decoded video.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.8
【参考文献】
相关博士学位论文 前1条
1 周圆;面向IP网络的多视点立体视频传输失真分析与建模[D];天津大学;2011年
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