Design And Implementation Of Network Camera Based On ARM

With the development of communication, microelectronic and network technology , Digital Video Surveillance System is being to embedded, digitalization, network, intelligent. Currently, network video surveillance system includes Network Camera, Network Video Server and Network codec such the third generation of monitoring products, that is application focus in safety-security area at present.But Network Camera is new generation product, which combines traditional camera and network video technique and integrates the function of video and network network transmission and posses independent IP address. Video signal is collected, compressed , transported through Internet to remote video monitor platform directly.At present, solutions of video surveillance system have many in monitor market, mainly includes DSP processor solution, CPLD/FPGA processor solution and ARM processor solution and so on. Use DSP processor solution has several advantage as follows, more flexible algorithm, operation speed, more clearer picture in monitoring terminal when using DSP processor processes and compresses video data. But it has several disadvantage with great development difficulties, long period and high cost. Using CPLD/FPGA processor solution has fast processing speed, embedded within DSP core, easy updating and high integration, but the solution has disadvantage of great development difficulties, and high development cost, so the extension of two solutions has certain difficulty in monitoring area.From the view of development trend and current technology, the paper presents an implementation scheme of network video surveillance system based on embedded technology. The system takes HUAWEI Hisilicon multimedia process chip HI3512 as hardware platform. We can set up Video Server based on TCP/IP and RTP protocol in HI3512 platform, HI3512 will compress video image from the collected data of CCD camera, then through network transmission by Internet, finished the network vedio surveillance tasks.The paper main contents includes: firstly paper expounds development status and development trend, analyzes basic principle and performance requirements of surveillance system in detail, presented overall design scheme. Secondly this paper introduces ARM processor, and introduces emphatically the use of system multimedia process chip HI3512 based on ARM9+DSP core. The modularization method is applied to the design of main peripheral circuit: CPU and memory module, audio and video module, power and reset module, network transceiver module, peripheral interface circuit and so on. Moreover the paper expounds the design of each module in detail, in addition, In addition, the paper mainly studied design of system PCB, includes design of EMC and anti-static measures. Thirdly this paper introduces embedded Linux operating system and starting principle and running process of Bootloader, and expounds how to compile and transplant for Bootloader and Linux kernel in ARM platform, and further researched and the development of Network Driver in Linux, and completed design of Network Driver. Then we debugged and tested main IC and the whole system. Finally we summarize the full texts and present futher development plan.This system realizes an surveillance solution of digitalization, network, low power dissipation, low-cost and small size. It meets the demands of system possesses advantages of realtime and reliability, and has great engineering significance and practical significance.