Dm355-based Embedded Network Video Monitoring System Design

With the development of electronics, computer,communication and the automation technology,the embedded video monitoring system becomes the trend of present security system. The paper merges the multimedia technology, embedded technology and network transmission technology into the field of video surveillance system and combine with the actual demand of Qingdao Technology Bureau source remote monitoring system, put forward a solution of embedded video monitoring system which uses the DM355 video processing chip and the MPEG4 video compression format, and the cost of development is relative lower.This article firstly introduces the current situation of embedded network video surveillance system and analysis the basic technology and core technologyof embedded video monitoring system in detail, compares the design scheme of embedded network monitoring system at the present stage, concludes that the four present programs can't meet the requirements, so we give a design scheme of embedded network video monitoring system which is suitable for the requirements of the project. To enhance the stability of the system, design a lot of decoupling and bypass capacitors in hardware circuit. And the JTAG debug interface is designed for convenient debugging. Select a real-time embedded operating system, Monta Vista Linux, for the real-time requirements. Modify and compile the operating system kernel to make it suitable with the hardware systems and transplant the kernel to the DM355 hardware platform successfully. In order to improve CPU utilization, use of multi-threading technology, and design a same sequential access method to prevent the deadlock. Improve the code efficiency of the development and debugging with the Log4plus mechanisms. Ensure the stability and smooth of video transmission through the shared memory technology in the video acquisition and network transmission process. To solve the problem of the convergence rate of streaming media with the adaptive algorithm which can adjust the media rate timely. Finally, after a reasonable test, the test results show that the hardware and software design of the system achieved the expected requirements.