【作者】 魏玉宽；

【导师】 周卫东； 徐军；

【作者基本信息】 山东大学 ， 电子与通信工程， 2007， 硕士

【摘要】 随着近年来通信技术的不断发展,特别是计算机网络以及图像处理传输技术的飞速发展,图像/视频在网络中有着越来越广泛的应用,画面清晰,无延迟抖动是视频通信应该实现的功能,也是视频通信处理的重点和难点。在没有QoS(Quality of Service)的IP网络中,研究传输高质量的视频信息,有着极其重要的意义。视频传输中最关键的技术环节是图像的压缩和解压缩。目前最新的视频编码标准是H.264。它是国际电信联盟视频编码专家组(ITU-T VCEG)和国际标准化组织运动图像专家组(ISO MPEG)于2001年合作形成的联合视频组JVT(Joint VideoTeam)开发的。由于同以往的标准相比具有同样图像质量前提下有更高的压缩编码效率,同时还有良好的网络适应性和抗误码性,因此被普遍看好为下一代的视频编码标准。本文借鉴目前视频压缩、传输的成熟技术,根据部队当前的实际需要,设计和实现一套端到端的实时视频流传输控制系统,围绕网络视频传输系统进行研究,着重于视频图像的实时性和传输质量两个重要指标,系统采用H.264的视频编码标准。在传输层协议选择方面,通过TCP协议和RIP协议的比较,提出了“基于UDP协议的RTP实时视频传输”的设计思想,较好地保证了数字视频传输的实时性和服务质量。在视频信号传输的差错控制技术和比特率控制方面,本文进行了重点地分析和阐述,通过采用误码隐藏,数据分割及图像层、宏块层比特率控制等技术,确保视频数据在信道上传输的可靠性和图像的恢复质量,从而保证了视频图像在网络上传输。更多还原

【Abstract】 With the continuous development of communication technology, especially the rapid development and popularization of the computer network, image processing and transmission technique in recent years, image or video is widely applied in network. Current IP Network has no guarantee of quality. The real-time video stream delivery which is the focus and difficulty in communication area, can meet the QoS requirements, and will have important meaning.The core of video communication is the image encoding and decoding. H264 is the latest video coding standard, which is developed by Joint Video Team (JVT) joined by both ISO/IEC Motion Picture Experts (MPEG) and ITU-T Video Coding Experts Group (VCEG). Compared with the previous standards, under the same image quality, it has better encoding efficiency as well as better Internet adaptability and error robustness. Therefore, it is considered wildly as the next-generation video coding standard.With the aid of current mature technique of video compression and transmission and according to the current effective demand of troops, this thesis designed a system of real-time video stream transmission and control. The video transmission system was researched by emphasizing the two important targets, real-time and quality, in video/image transmission. The system adopted H.264 video coding standard. In the respect of selecting transmission layer protocol, a new design idea of RTP real-time video transmission based on UDP protocol was put forward by comparing TCP protocol with RTP protocol which can guarantee the real-time and quality of service in digital video transmission. We mainly analyzed the error control and bit-rate control of video signal transmission with the technology of resynchronization marker, data partitioning, and the bit-rate control in picture layer and macroblock layer. The system could ensure the reliability of video data transmission and the restoring quality of images in the communication channel and network.更多还原