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Video surveillance system and rail transport safety


You can cover the whole range of video surveillance along the track, rail transportation has played the \(2) video surveillance system information overload. Such as: a station 8 camera, a line of 20 stations, the control center staff need to monitor 160 cameras; if every 2s to switch a screen, you will need 5 ~ 6rain round of monitoring points in order to check all the time. This work is difficult to ensure timely identify problems quickly, so the need to reduce the workload of video surveillance. * 85 * l In view of this distance, it is necessary to play the potential of digital video surveillance technology to further improve rail safety. 3 upgraded video surveillance system to enhance rail safety monitoring system using digital video transmission system mechanism and image processing and pattern recognition technology, in theory, solve the two problems. Digital video surveillance system does not depend on the network physical media, images can be transmitted using a variety of networks, including wireless networks. Now emerging wireless broadband technology, such as LMDS (Local Multipoint Distribution access), TETRA (Terrestrial Trunked Communication System),[link widoczny dla zalogowanych], GPRS (General Packet Radio Service), CDMA (code division multiple access technology), 3G (3rd generation mobile communication technology), wU (wireless LAN), Bluetooth and other technologies to provide 100k ~ 10M or even higher bandwidth. If the application from the frequency,[link widoczny dla zalogowanych], bandwidth, coverage, technology maturity and Zuwang Fang will consider such factors, the WLAN has the indisputable advantage. Image coding technology, such as wavelet transform,[link widoczny dla zalogowanych], MPECA, can rate the image from dozens Kbit / s to several Mbit / s range, and the bit rate can be adjusted. Therefore, wireless technology and image compression technology to ensure that the images transmitted via the bandwidth requirements of wireless technology. Through the introduction of the train and ground broadband mobile communication technology, such as WLAN,[link widoczny dla zalogowanych], can be extended to train the network, thus achieving the train control center video surveillance. WU technology based wireless networking programs, combined with VLAN (Virtual LAN) division, but also in addressing the video surveillance of the vehicle while providing passengers with broadband communication tools to improve service levels - level. Image processing and pattern recognition can be detected using video image brightness anomaly of fire, can also detect and analyze the movement of objects, and thus the analysis of human behavior, fighting and other strenuous exercise to detect a person in a regional long-term stay the illegal invasion and other abnormal behavior,[link widoczny dla zalogowanych], and automatically control the PTZ (horizontal and vertical panning) to follow the target by the camera. Through the introduction of image processing and pattern recognition analysis of the behavior of passengers in the auto alarm when abnormal conditions, manual intervention after the receipt of alarm, which can greatly reduce the workload of video surveillance operations, and reduce the possibility of missing important information sex. So you can upgrade from the following two video surveillance systems to solve the problem of blind spots and information overload: ① On the train, the introduction of digital video surveillance system; ② increase of each camera image processing and pattern recognition equipment. Although rail transport has been equipped to deal with blind spots and the amount of information in video surveillance technology may be the problem, but from the video surveillance system security and reliability point of view, the relevant solutions need to be applied to proven rail transit system. Alcatel has been in Hong Kong subway system on-board video surveillance solutions, the feasibility of a successful test. Therefore recommended that an active investigation of these rich Railway Communication System and video monitoring system design experience to provide solutions for manufacturers and explore with them to develop or upgrade the video surveillance system in due course to further enhance rail safety.