Design And Realization Of A Wireless Video Monitoring System Based On JMF

Along with the rapid development of computer technology and unceasing renewal of network technology, more and more multimedia related applications are coming out on the network. As an extension of multimedia field, video monitoring technology has blended into many aspects of people's lives to help them get information quickly in convenience. With the arrival of 3G wave, wireless video monitoring becomes a hot research spot nowadays. Currently most video monitoring systems are based on embedded development. Although this method can realize the function of video monitoring, but there are many shortcomings.First, this kind of system has much dependence on hardware. Second, the development cost is too high. Besides, bad portability and having no cross-platform-ability are also its defects. In order to solve these problems, taking the wireless road condition monitoring system of road digital dynamic management system for road management bureau of Dalian Development zone as background, this paper designs and realizes a wireless monitoring system based on JMF.The paper first introduces the history and current situation of video monitoring, and expounds the research background and significance briefly. Then various technologies which are needed in the system development are analyzed and studied,including JMF technology, multicast technology, real-time transmission technology, video coding technology and NAT technology. After mastering there technologies, the paper gives a detail design for the whole system and realizes the system according to the design scheme by programming. The whole system is divided into three big modules:video capturing module, center management server and client monitoring module. According to the project requirements and JMF characteristics, H.263 and JPEG are chosen as video coding standard.Then by analyzing and comparing the existing wireless networks, we get the feasibility of using 3G as transmission network. Each module not only performs its own functions,but also cooperates with each other to complete more tasks.The system is realized by pure software programming. So it gets rid of the dependence on hardware and also reduces the development cost. Meanwhile, as a multimedia development framework provided by SUN, JMF extends the cross-platform-ability of Java. So, the system can run on various platforms.By test, when the network is in normal situation, the system can replay the real-time monitoring video smoothly. The system runs stably and reaches the expected target.