27-07-2011, 04:02 PM
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ABSTRACT
This seminar introduces a Smart Home Security System based on the technology of ARM9 and 3G communication. It uses S3C2410 hardware platform and Embedded Linux Operating System to implement the real-time display of the video images on the development platform. It presents the structure and work principles of the system, puts emphasis on the hardware processing circuits and design of video image software as well as the foundation of 3G remote communication. Another ,It carefully analyzes and studies Video data compression of USB digital camera and the 3G network transmission. Thus, a design of a convenient and economical device on real-time video capture and transmission is realized.
INTRODUCTION
With the continuous improvement of people's living standard, people pay more attention on their own personal safety and property security; Contemporary, The rapid development of the economy along with the city's population sharp increasing, add a new problem to the city social order, to protect the security of personal property and prevent thieving incident happened, every family must have its own security system. In their traditional family system anti-theftalarm, fire alarm, and gas leak alarm subsystems’ functionare single , false alarm rate is higher, it can only achieve local alarm, can not achieve remote alarm in real time to reduce losses, but also record evidence of a crime for later inspection. To resolve these shortcomings and scarcity, and meet people's needs for intelligent home, therefore, adopting image processing technology and 3G communication technology the paper studies and designs smart home security system based on ARM9 and 3G.
3G NETWORKS
3G is the abbreviation of the 3rd Generation, which refers to the third generation mobile communication technology. Relative to the first generation analogue phones (1G) and the second generation GSM, TDMA digital mobile phones (2G), in generally speaking, the 3G mobile phones refers to a new mobile communication system which combine the wireless communication with the multimedia communication such as the international internet. It can process the images, music, video stream and other forms of media, which can also provides many kinds of information services, such as web page browsing, conference call and e- commerce. In order to provide such services, the wireless network must be able to support different data transmission speed, which means that it must respectivelysupport the transmission speedof2Mbps(megabit/second),384kbps(kilobits/ second) as well as 144kbps in the indoor, outdoor and vehicular environments at least[2]. In current, the 3G mobile phones (3G handsets) have three kinds of standard criteria in the world. They are the WCDMAstandard in Europe, the CDMA2000 standard in America and the TD－SCDMA standard, which is produced by Chinese scientists. The three mainstream wireless interface standards of 3G communication determined by International Telecommunication Union (ITU) is respectively W-CDMA (Wideband Code Division Multiple Access), CDMA2000 (code division multiple access 2000), and TDS-CDMA (Time Division-Synchronous CDMA).
THE STRUCTURE AND WORK PRINCIPLES OF THE SYSTEM
The system is mainly composed of alarm input, control unit, video processing, 3G wireless communication and alarm output, and its working principle as shown in Figure 1. when the system works, the control unit detected circulate door magnetic sensor installed above the door, infrared, smoke, gas sensor, once there is illegal personnel have intruded, gas leak or firing, etc., it will immediately issue a warning signal to the CPU[3]. CPU will determine which and where the alarm is, the scene immediately sends a sound and light alarm and takes emergency treatment, by controlling the camera to capture video images, and then put collected video image data into buffer, and then run the image display program which is transplanted to Embedded target platform, for processing and displaying the buffer zone of the image data. Further, which can be saved into a data file format and labeled UDP packets, through the 3G network send images to the remote user mobile phone. In addition, even if the host is away, he may master the situation at home through the 3G network, and set defending or withdrawing mode to achieve remote monitoring function.
