| With the increasingly sophisticated of embedded technology and the rapid development of mobile communications, current existing Video Surveillance equipment such as network video recorders has not been able to meet the demand for gaining information anytime no matter where you are. As the 3G standard set and related equipment launched, it is gradually possible to realize real-time data transmission with Mobile network. In recent years, due to the rapid development of embedded processing technology, High-speed embedded processor has been able to complete real-time process of multi-channel video, which make Intelligent Mobile Video Surveillance System become the research hotspot.The P2P Intelligent Mobile Video Surveillance System proposed in this paper is based on mobile network, which not only solves the problems of existing surveillance system, such as passive, fixed-point and not-smart and so on, but also make the information transmission safe and reliable. As a result, it will have a wide range of application such as Safety at home, school monitoring, traffic information monitoring, large-scale factory and public places monitoring and so on. In this paper, conduct a feasibility analysis of smart mobile video surveillance separately from the intelligent monitoring to the mobile monitoring, based on which, it gives the design, Principle and Simulation of Algorithm, followed by introducing to design the server and the client of the smart mobile video surveillance.1. The Design of Intelligent Mobile Video Surveillance SystemThe Intelligent Mobile Video Surveillance System proposed in this paper is based on P2P mode, and compared with Store-and-forward mode, it leads into the concept of Dynamic address resolution, which helps ensure the information security and improve the real-time. This design makes use of GPRS network to complete data transmission, so it's necessary to analyze the structure of network first, and taking into account the Narrow bandwidth of existing networks, the paper proposes three mobile network video data transmission solution in such situation:(1) Video CompressionAbove all, this article compares the M-JPEG compression algorithm with the MPEG-4, both of which are the representative of intra-frame and inter-frame compression. Taking into account the mobile network many-routing and large volatility, the M-JPEG algorithm is simpler and easy to achieve, and what's more, it can adjust the parameters according to network status to meet the need to transfer data in Network status unstable environment. As a result, the paper prefers to M-JPEG algorithm.(2) Transfer ProtocolIn this paper, RTP / RTCP is used as the protocol in data transmission network to ensure the higher real-time, and together with the RTCP protocol, to ensure the transmission stable. The RTP used in this paper is based on UDP and it's necessary to give the principle of it.(3) Control ModeTo ensure the reliability of the transmission in mobile networks with wide volatility, the paper proposes three control modes, which are the channel and terminal joint control, network status monitoring and prediction and terminal feedback control. In order to predict the network fluctuations, it takes some prediction method to monitor the status of network.Regarding Intelligent design, the paper brings up the intelligent warning methods and the target acquisition and tracking methods. The purpose of intelligent warning, which mainly uses the motion detection algorithm,is to give warning information for anomalies and sudden event timely and reliably. While the goal of target acquisition and tracking methods which helps personnel to complete monitoring, is to complete a real-time tracking of suspicious targets or custom ones.The algorithms used in this design consist of video compression algorithm, intelligent warning algorithm, target acquisition and tracking algorithm. The paper presents the principles of the three algorithms in detail, and taking the acquisition and tracking algorithm for example, it proposes the detection method of optimum correlation point based on wavelet transform and the method of least squares, and gives the results of simulation through using Mexico Hat wavelet.2. The Design of Intelligent Mobile Video Surveillance ServerThe design, which uses P2P mode, and works on C/S mode, is divided into intelligent mobile video surveillance server and client. First of all, it introduces the design of intelligent mobile video surveillance server in both hardware and software aspects.(1) Hardware Design of Intelligent Mobile Video Surveillance ServerThe core of the hardware platform is performed by TMS320DM642, whose dominant frequency reaches up to 600MHz, and it provides rich peripheral interfaces. The hardware platform includes video capture and playback module, network module, memory module, power module and IO expansion module. It takes SAA7121H and TVP5150AM1 as Video codec chip, and BCM5221 as the core chip of network module, and what's more, MT48LC4M32B2 is used as the SDRAM of memory module, while FLASH chip use S29AL032D, and IO expansion make use of CPLD. The article introduces the method of design and the process of debug, including the test of each module and the solution of most common problems.(2) Software Design of Intelligent Mobile Video Surveillance ServerIn order to improve development efficiency and shorten the development cycle, the design of software is based on DSP|BIOS and RF5. Before introducing the method for designing intelligent mobile video surveillance server, such as the distribution and schedule of thread, and the transplantation of core algorithm, the paper gives the basic concepts of DSP|BIOS and RF5, and finally illustrates program flow chart and experimental results.3. The Design of Intelligent Mobile Video Surveillance ClientWith the popularization and development of smart of mobile phone,the design of intelligent mobile video surveillance client is mainly based on mobile phone. In order to improve software portability, it makes uses of JAVA. The development of mobile phone and the method of the design based on J2ME are introduced first, followed by elaborating the way to design software of intelligent mobile video surveillance client, including implementation method of each functional module, whose purpose are to achieve the functions of video data reception and playback, interactive control commands sent, Image storage and so on. This part is ended up with the program flow chart and the effect of presentation figure.4. SummaryIn this paper, the design of Intelligent Mobile Video Surveillance System could rate up to 3-5 frame/sec, under the condition of with a resolution of 176×144 in the GPRS network, and furthermore, it has the functions of video capture, video playback, image storage, intelligent warning and target acquisition and tracking, etc, and mostly completes the mission established. The system has more extensive application of space on intelligent home, schools and factories surveillance, etc. With the development of 3G, Intelligent Mobile Video Surveillance will be applied widely along with the capacity of storage medium increasing. |
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