| It is well known that the information content obtained by vision occupies 70% in the total information content, and video frequency information has a series of advantages of visualization and reliability. In recent years, according to the fast development of network technology, multimedia technology, communication technology, the market need of network video frequency is widely used in many fields, such as daily life, industrial production, modern security, scientific research. Now, video frequency surveillance begin to break out traditional space-time limit, towards the development of network and digitalization. Real-time long-range transport become possible through video frequency surveillance based on computer technology, network technology, embedded equipment.The embedded technology is the spread of computer technology, that is to say, it makes computer technology entering into a new field. So it becomes one of the hottest topics. Based on the previous research results, this paper put forward design program of network video frequency surveillance system of streaming-media transport on the embedded platform, conbining with embedded technology,network technology,video frequency technology. It has the features of stable performance,easy maintenance and management,strong expansibility, and the advantages of low cost,low power,flexible use,strong expansion and upgrade, compared with video frequency system on PC computer. This system has realized remote supervision using network, the data collected by camera is transported to Web server through development board, so in this condition, the client can brows the monitor.This dissertation summarizes the features, theory and development method of modern embedded system, and discusses the construction of developing environment, system transplantation, design and implementation of video collection program and streaming-media transportation program, on the background of embedded system,video collection and streaming-media transportation. It adopts the development board of Samsung s3c2410 processor based on ARM9 board and the hardware of USB camera, and the software on the platform of Linux kernel. In the construction of embedded developing environment, the installation and setting of Linux on the host computer are introduced. In the system transplantation, transplantation of Bootloader and Linux kernel, the manufacture of Root File System are introduced. In the transplantation of driver program, USB communication theory and the driver program of the related device how to make by using the exist driver program are introduced emphatically, which is also an innovation. In the field of video collection, the multi-threaded collection thoughts are put forward by using the related library, help to accelerating collection speed. In the field of streaming media, the streaming-media transportation method made by using the exist library file is introduced emphatically so as to improve work efficiency. At last, program download and testing are introduced, which is the specific work in the embedded system. The application adopts module design method, to reduce the coupling, to improve the system efficiency. In the developed video frequency surveillance, the studied technology discussed achieves success and has a better effect.The embedded system will have the greater market potential and the more developers busy on it in post PC era. Apart from the abundance of software and hardware knowledge, it needs the large of practise experience.The integration of theory and practice are both an effective means of the researhing embedded system and the method of promoting the embedded system fast developing. Looking into the future, the embedded system will be cheaper, smaller, more realiable, more efficient and more intelligent than today.Embedded system will have a greater market. |
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