A Video Monitor System Of Coal Gas Well Based On 3G

Our CBM industry has entered a period of rapid growth, it is important to grasp the situation of coal-bed methane fields of the video for the safety of CBM. Therefore, this paper presents a 3G-based video surveillance system based on the characteristics of CBM.Our coal bed gas fields are located in the land of the vast and majority of fields are located in inaccessible places.If CBM video surveillance system is established by the traditional methods, the problems such as cable laying face difficult and high maintenance cost will appear. The wireless monitoring system which is built by the 3G networks that has the advantage of high transmission rate will be used widely.Firstly, the comparison of 3G networks and the compression of video algorithms make us choose the China Unicorn's WCDMA network and the H.264 network algorithm which is best for the network transmission. The video signal compressed by the H.264 algorithm appears good transmission efficiency with the support of WCDMA, Which is proved by practice. The terminal in WCDMA does not have the public IP address, so that the monitoring center can not access to the terminal device. Building the VPN between the monitoring center and the front-end equipment will solve this problem and protect the network security. This CBM system consists of front-end video capture devices, video servers,3G routers, and center software. The full-featured video surveillance software is written in C#. Finally, an image storage strategy using the frame difference method is presented to save the system's memory resources. Whether there is a change of scene is determined by the gray value of the monitor pictures at different times. Practice has proved that this strategy will greatly reduce the system memory storage space and improve the efficiency of the system.With the development of the 3G network's high-speed data transfer rate, this system will meet the needs of many applications.