201O International Conference on Computer Application and System Modeling (ICCASM 2010)

Mobile Video Surveillance System of3G Network based on ARM9

Hongwei Song Department of Computer Science,

Shijiazhuang Institute, Shijiazhuang China

shw _ hongwei@sohu.com

Qian Zhao School of computer science and engerning,

Hebei University of Technology Tianjin China

Zhaoqian0731@sohu.com

Xiuyan Feng Department of computer science ,

Shijiazhuang vocational technology institute shijiazhuang china

Yi Chi Department of Computer Technology, Shijiazhuang

Railway Institute, Shijiazhuang China

Hao Yang School of computer science and Technology,

Nanjing Normal University Nanjing Jiangsu China

Abstract-Mobile video surveillance system based on ARM9 uses unique high-bandwidth business applications of 3G wireless network. The design of hardware and software of embedded monitoring system is described. The running platform of 3G network show that the system can work well in the circumstances of the limited bandwidth.

Keywords-3G network;mobile video surveillane; ARM9

I. INTRODUCTION

Mobile video surveillance has been envisioned in the literature as either classical video streaming with an extension over wireless networks, with no processing at remote side but only remote control by a human operator [1-3], or as a special case of distributed wireless sensor networks in which one type of sensors corresponds to video sensors[4].Video surveillance system has gone through three stages including Simulation Monitoring System, Digital Monitoring System and Network Monitoring System which is the most popular, most widely used. Wireless Internet monitoring system which is based on GPRS (General Packet Radio Service) or CDMA (Code Division Multiple Access) is born when wireless communication service providers start to provide data communications services[5,6].

Whether it is CDMA or GPRS network, the supreme bandwidth is less than 100kbps. Usually transmitting the acquisition time interval of a few seconds of images, image continuity is poor and can not transfer real-time coherent picture[7]. The 3G (3rd-generation) is able to provide a diversified, high-quality multimedia services, to achieve seamless global coverage, global roaming capability. In the quasi-static conditions, the rate of 2 Mbps can be achieved, even in high-speed train, the data rate is up to 144kbps, to support multimedia services such as audio or video. Based on mobile terminals for mobile video surveillance system will be

a hot research as the mobile terminal equipment (such as PDAs, smart phones and car alarm systems, etc.) performance is continually improved.

II. WORKING PRINCIPLE OF THE MOBILE VIDEO

SURVEILLANCE SYSTEM

The applying S3C2440A of ARM920T processor system can provide a strong driving force for a variety of mobile multimedia software and an integrated support for MPEG-4 format hardware video codec, support for resolutions up to VGA (640x480) MPEG-4 format video codec, maximum frame rate 30f/s. In order to fit the 3G network ,adaptive MPEG-4[8,9] video encoder is used, it can obtained the high quality video by adjusting encode parameters automatically.

Mobile video surveillance systems use GPS receiver for automatic positioning. GPS receiver module of mobile terminals receives GPS satellite positioning data to calculate its own position. 3G modules send the location, status, alarm of mobile terminal and input information of sensor which is coded according to the protocol of the agreement to the 3G network through the SMS. 3G network will receive the mobile terminal location information transmitted to the monitoring center of the communication gateway, through the communications gateway processed, forwarded to the control terminal, and the geographic information system (GIS) map shows location of mobile terminals. Thence control center can be grasped the dynamic location of mobile terminals clearly and directly.

III. THE SCHEME OF DESIGNING AND REALIZATION FRO THE

MOBILE VIDEO SURVEILLANCE SYSTEM

A. Construction of Mobile Video Surveillance Mobile Video Surveillance System is composed by the

mobile terminals, 3G wireless network and monitoring center

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2010 International Conference on Computer Application and System Modeling (ICCASM 2010)

figure 1.

,-----------1 1 SURVEILLANCE CENTER: 1 1

I GATEWAY I i 1

r-------,I

MOJITOR TERMINA 1

Figure 1. Structure chart of the Mobile Video Surveillance System

Mobile video capture device mainly consists of S3C2440A development board, GPS module, 3G module, mobile control unit, sensors and USB camera device, of which S3C2440A as the control center, which is a hub to connect these devices to send and receive video information.

Mobile devices transport two-way information through control centers and 3G networks.It receives GPS positioning signals and receives instruction data from monitoring center while mobile terminal location and status information is sent to the monitoring center. 3G network is the data link between the mobile terminal and the control center for information exchange. Its functions includes: the accurate GPS positioning information back to the monitoring center, monitoring center information transmission for mobile devices. The monitoring center consists of communication gateways and monitoring terminal devices, which completes the transmitting of all kinds of information. On the one hand, mobile terminals receive the information, and information is distributed to the monitor terminal computers in order to achieve the monitoring of mobile targets. On the other hand, response monitoring computers issue commands information to the mobile device, and to the appropriate mobile devices.

B. Hardware Design Description In the aspect of hardware design, system uses Samsung's

S3C2440A as embedded processors, and peripheral hardware circuits with embedded core board. Mobile collection equipment consists mainly of audio and video capture devices and embedded hardware.The hardware structure is shown in figure 2. Audio and video capture and MPEG-4, CAT coding are completed by the S3C2440A

processor, and assume the AID conversion, compression, data encryption, wireless sending task. Video signal collected by Video camera send into the device by the video input interface and complete the decoding conversion. After decoding the digital video into the main processing chip, the MPEG-4 hardware encode for video compression coding. Microphone collected audio signals is sent through the audio input device and complete the PCM coding. Digital audio via I2S bus sent to ARM processor modules by the CAT coding compression.

ARM920T running embedded Linux operating system, user applications can adjust the resolution of MPEG-4 encoding, frame rate and bit rate, can also set the audio encoding rate of CAT module. Applications process the compressed encoded audio and video data to AES encryption, to form the control data transmission and storage, followed by one hand, the embedded Linux drivers to write the data to the SD card, on the other hand the data in accordance with the RTP packet network protocol package, through the 3G wireless module sends to the network. Users can use portable computers in the field through the USB interface configuration front-end collecting device parameters, which are written in Flash chips under the control of ARM. Some parameters become effective immediately after being set up. Some parameters take effect after re-start the front-end device, depending on the circumstances. In addition, real-time video data collected through the USB interface, can also be sent directly to portable computers.

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Video Input Interface

f-----'------��3G Module

Audio Input Interface

Figure 2. Hardware structure chart of the mobile terminal

Back-end receiving equipment is to receive control data features, taking a wireless receiver and data decryption tasks. Just as the front-end collection equipment, it uses embedded system design. The receiving device can directly from external DC power supply on account of applications.

C. Transmission Design Description RTP is a point to point or multipoint transmission

service to provide real-time transport protocol defined in RFC3550. It does not as a separate network layer to achieve.lt can not provide a reliable transport mechanism for sending data packets, and it does not provide flow control or congestion control, but relies on the RTCP (Real-time Transport Control Protocol) to provide these services. RTP

and RTCP allow them to be used in conjunction with effective feedback and minimal overhead to achieve optimal transmission efficiency [1 0].

The part of Transfer completes RTP / RTCP protocol packing and unpacking, network distribution and data acquisition[ll]. Based on RTP / UDP / IP protocol stack of the MPEG-4 media streaming is the sub-module of network transmission part of mobile video surveillance system[12]. It uses Linux-based JRTPLIB RTP library to achieve real-time transmission. Transmission part of the system architecture is shown in figure 3. The whole structure consists of three main parts: audio and video data source, video transmitter and video receiver.

---------.., Audio and video Data I Video Sender

CAT Audio/ Compression Codin

I .---------,

Figure 3. MPEG-4 real-time streaming chart based on RTP / UDP / IP

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IV. CONCLUSION

3G network platform in the run test results show that the system can work well under the circumstances of limited bandwidth. The maximum real-time video resolution can achieve VGA (640x480), the maximum frame rate up to 30£'s in the wired network. In the 3G mobile network platforms it can achieve maximum video resolution VGA (640x480), the maximum frame rate up to 25f/s.

View of the important position of the mobile streaming media applications which based on 3G high data bandwidth business applications, combined with embedded and network video surveillance technology design a 3G-network for mobile video surveillance system and studied the system components and working principle, final, design of the system's overall framework and the system of the key technologies. The system fully take into account the characteristics of 3G wireless networks and advantages,and it of effective complement to deficiencies and shortcomings of the traditional fixed-line video surveillance system. It has a high reference value for the industry, technology and product development and market expansion.

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