| The video surveillance system has been applied in warehouse security and many other areas with the progress of information and technology.Embedded video surveillance system based on network becomes unique in this area for its small size,good stability,low power consumption,easy to expand,etc.But it has brought inconvenience to the installation and maintenance of video surveillance system for the complicated wiring work,so video surveillance system based on mobile wireless network comes into being.Adhering to the concept of "Mobile Internet +" and considering practicality and flexibility,an embedded real-time multi-channel video surveillance system for warehouse-liked security based on mobile wireless network technology has been proposed,which can acquisite signals of human infrare which is set as an intelligent swich of video capture,and can control the video reversly and give an alam on moving objects at the monitoring client,etc.Transplant H.264 software on ARM platform to improve transmission efficiency and make some optimization on the software to relate its computational complexity.Make the system real-time and multiple by UDP communication and RTP transport protocols.Make a system networking between the front ends and control terminal by VPN technology.Build ARM platform,tailor Kernel and transplant Drivers to underlying support modules according to the system function.In the data acquisition and processing.Acquisite video signals through OV9650 by SDL and V4L2,signals of infrared sensor though HC-SR501,and make a video intelligent start by infrared signals.Transplant x264 video compression software on ARM platform to improve transmission efficiency and reduce GPRS loss,make optimizations on compilation,code and intra/inter prediction algorithm to reduce its computational complexity,and then a test is followed.In the network transmission.Make the system real-time and multiple by UDP communication and RTP transport protocols.HUAWEI ET128-2's dial-up internet access is made up by converting USB port operating modes and compiling the PPP dialer.For the problem that every end is in a different network,LZO,OpenSSL,OpenVPN and ntp is compiled to connect the VPN network and to make the system interconnected,and a response performance test is followed.At last,a reverse control is designed to the video capture by a Matlab GUI mix programmed with Matlab and C on PC,achieve an alarm function on moving object detection,and infrare detection by inter-frame algorithm and e-mail sending function with SMS informed. |
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