As an important part of the urban public transportation system, there are many types of urban rail transit, including subway, light rail, suburban railway, tram, and suspension train, which are known as the "aorta of urban transportation". Judging from the current construction of urban rail transit in China, subway traffic has an absolute share. Therefore, this article focuses on the solution of the subway traffic security video surveillance system.
At present, video surveillance systems have been installed in metro stations, depots, and parking lots in major cities in China, which has realized 24-hour security monitoring of the status of stations, depots, and parking lots, and has played an important role. Although the application of video surveillance systems in subway traffic has become more popular, in terms of breadth and depth of application, there is still a long way to go; at the same time, due to the massive adoption of video surveillance system construction programs for subway traffic at this stage It is analog video equipment and digital video equipment. Therefore, how to apply new technologies and new functions in video surveillance and even the entire security field to speed up the promotion of subway traffic video surveillance to clearer, more complete and more efficient applications; how to make digital It can be well integrated with the analog equipment in a system, and the two can be interconnected, accessed, controlled, etc., which is very critical!
Functional Requirements
As an important means of subway traffic maintenance and transportation safety, the video surveillance system can be used by the operating department to provide dispatchers, control staff at various stations, train drivers, etc. for train operation, disaster prevention and relief, and passenger evacuation for the control center. , Passenger traffic, and visual information about staff onboarding; for public safety departments, it can be used to provide objective image basis for various passenger disputes, accidental casualties, public security criminal cases, etc., and even use it to counter terrorism Anti-terrorism, through which you can see and record the occurrence of accidents and disasters in a timely manner. At the same time, you can make scientific and correct adjustments to all police forces. Through it, the image follows the passenger flow, the image follows the order, and the image follows the case. Go and establish a flat point-to-point service command mode.
From a simple point of view, the subway video surveillance system can be seen as composed of two parts: inside and outside the computer room. The core equipment outside the machine room is the camera, which is mainly distributed in the platform, station hall, escalator, part of the machine room, transformer room of the substation, 10KV switch cabinet room, AFC ticket machine and gate, entrance and exit, vertical elevator and car, Important public areas such as access lines, level crossings and rail areas, parking and inspection garages, garage washing, etc. Through the selection of different types of cameras and a reasonable project layout, to complete the video collection of the entire station, to achieve full coverage without dead ends. The core equipment in the computer room is the control and management workstation, gateway, streaming media server, network video recorder, storage device, codec, TV wall, matrix, etc., mainly distributed in stations, transfer stations, parking lot control rooms, operation center control centers And the depot standby control center, etc., through these devices to complete the system media stream processing, intelligent analysis, control signaling interaction and other functions. According to the above analysis, it can be seen that the equipment inside and outside the equipment room has the characteristics of wide geographical distribution, complex use environment, wide variety of equipment, and cross-technology systems. Therefore, it also has extremely high requirements for system maintenance and management, and interconnection and interoperability.
For now, the entire system needs to have the following functions: real-time monitoring, PTZ control, image selection and call, video storage, camera range control, priority setting, character superimposition, intelligent analysis and remote system management control, and can be controlled by Integrated by the integrated monitoring system.
PTZ control and image selection function
System requirements can control the PTZ according to priority; the camera image can be displayed and controlled at the station, control center and temporary / standby control center at the same time, and can also be displayed and controlled in the integrated monitoring system. The station attendant can choose to call the image display of any camera of the station locally, and the dispatchers of the control center can remotely call the image display of any camera of the local line, which can be automatically cycled by various timings or manually by the operator Switch.
Character superposition function
The system can superimpose information such as the station name, camera number and location, date and time of the camera, and the name of the operator who is controlling the gimbal camera in real time and display them together.
Video distribution function
The video images of each camera can be divided into multiple image outputs to meet the requirement that multiple video surveillance systems share the same front-end camera.
Real-time monitoring function
The system can monitor the same monitoring screen at the same time, and can also monitor different monitoring screens according to the needs. It can perform single-screen and multi-screen split display, such as fixed monitoring, loop monitoring, and multi-screen split monitoring.
Digital video storage function
Video images are digitally stored in real-time uninterrupted recording, with the function of solving self-overflow and non-stop cyclic storage; with multiple recording mode functions such as automatic timing continuous recording at any control point, manual recording, pre-made recording, and image coding Technology, clarity, stream size, frame rate, etc .; with video playback and retrieval functions, playback does not affect normal recording storage, fully distributed video storage query, retrieval services, retrieval and playback of stored video across the network, and does not Affect the storage function of normal video; a variety of video data presentation functions, such as: video data extraction, video playback, playback processing function, search query, image capture printing; support for local direct-attached storage (DAS), storage area network (SAN) and Various storage technologies such as network attachment storage (NAS).
Priority setting function
It has the functions of priority multi-level setting, hierarchical control, control operation delay dwelling, PTZ occupancy display, etc.
System intelligence function
Public security video surveillance systems in subway video surveillance systems often require real-time video intelligent analysis of video images, such as the suspicious items left behind, crossing the restricted area alarm, video motion detection, long-term stay of suspicious personnel, sudden passenger flow alarm, and mutation alarm Intelligent analysis functions such as identification.
System network management function
It can set parameters, program design, fault alarms and equipment for video surveillance system equipment such as cameras, analog video matrix, control terminals, transcoders, picture processors, storage devices, video character superimposed devices, video distributors, switches, etc. Comprehensive management such as power control management. In addition, it also includes functions such as user and authority management, device management, fault management, network information security management, log management, remote power management, and clock synchronization management.
System expansion function
Modular technology is used in the design. The expansion does not affect the use of existing equipment. The software is basically unchanged, and the hardware has only a small increase. The expansion method is simple and easy to use in software and hardware, safe and reliable.
Application solution
In response to the above application requirements, the subway video surveillance system is divided into two sets of subsystems: operating video surveillance system and public security video surveillance system. The two only share front-end processing equipment such as analog cameras and video distributors, while the rest of the system is relatively independent.
Among them, the operational video surveillance system has a two-level architecture. A second-level monitoring center is set up at the station / interchange station to be responsible for monitoring the relevant conditions of the station. A first-level monitoring center is set up at the control / standby center to be responsible for remote monitoring of the entire line. Figure 1.
The public security video surveillance system has a three-level architecture. A three-level monitoring center is set up in the police duty room of the station / interchange station to monitor the relevant conditions of the station. A second-level monitoring center is set up at the police station to monitor the relevant situation of the station / interchange station where the jurisdiction is located. , Set up a first-level monitoring center in the bus team, responsible for remote monitoring of the entire line, the schematic structure shown in Figure 2.
The long-distance transmission adopts the special Gigabit IP network of the construction party, and the IP address is planned by the construction party.
The control center and station-level dispatchers monitor the station passenger flow, passengers getting on and off, and on-board conditions through this system in real time to ensure the safe transportation of passengers; in the event of an emergency, commanding on-site rescue and passenger evacuation, and all-round video recording of all camera images It can provide relevant video and image basis for post-mortem analysis and identification of responsibilities.
The system provides PTZ control and image selection, real-time monitoring, character overlay, video distribution, digital surveillance video storage, image playback, priority setting, intelligent analysis, network management and other functions, and can be integrated by the subway traffic comprehensive monitoring system. In order to further expand the application of video surveillance system.
Station System Solution
According to the design and construction mode of the existing video surveillance system, from the perspective of technical implementation, the station video surveillance system can be divided into two parts: analog surveillance system and digital network surveillance system. As a management platform of emerging technology, the digital monitoring system is compatible with the analog video system of stations, depots, and parking lots, which is an inevitable result. The solution integrates the station digital and analog systems through the "interface gateway" of the digital monitoring system, so that the two can be interconnected, accessed, and controlled.
In platforms, station halls, escalators, some machine rooms, transformer rooms in substations, 10KV switchgear rooms, AFC ticket machines and gates, entrances and exits, vertical elevators and cars, access sections, level crossings and rails Areas, parking and inspection garages, washing garages and other important public areas, through the selection of different types of cameras (such as high-definition, wide dynamic cameras, etc.), combined with a reasonable engineering layout to complete the entire station video collection, to achieve no dead ends, No omissions, all-round video image coverage.
Control the rotation of any analog camera pan-tilt and the adjustment of the zoom lens through the client and interface gateway, and display it in various programs, or manually choose to display 1/4/6/8/9 / on the monitor 10/12/13/15/16 pictures, view multi-picture real-time images and on-demand historical images under license conditions; display the situation of camera gimbal occupied; low-level users only release high-priority users on this site Only after the control, the PTZ can be operated.
After the analog image is converted by the intelligent analysis encoder, it is stored on the network storage device through the unified management and scheduling of the station's digital video equipment; it meets the requirements of all video storage of this station; it supports RAID0, RAID1, RAID5 disk array combination and realizes global hot backup The function of the disk has the ability to damage at least one hard disk without affecting the normal storage of the video and without losing the stored images in the disk array. At the same time, through the intelligent analysis function of the intelligent analysis encoder, the requirements of the public security video monitoring system for real-time video intelligent analysis of the video are completed. When the system needs to be expanded, the expansion is simple and does not affect the use of existing equipment. The schematic diagram of the network is shown in Figure 3.
Control Center System Solution
The network management system of the system simulates the video matrix, camera, control terminal, transcoder, picture splitter, switch, network video recorder, platform server, management server, interface gateway, storage device, video character overlay and distribution of the video surveillance system Device and other devices for comprehensive management such as parameter setting, program design, fault alarm and power control; with user and authority management, device management, fault management, network information security management, log management, remote power management, clock synchronization and other functions.
The system center controls the client to select the pictures taken by all analog cameras in each station. Cyclic display with various programs or manual selection of preset positions, viewing any image at any station or different dispatchers watching the same image at the same time; the image of the same camera can be displayed at the same time, or the images of different cameras at the same station can be displayed, or The images of the cameras of different stations, and maintain the normal display of images; switch the images of each station to the large screen of the dispatch hall; control the rotation of any analog camera pan and tilt and adjust the zoom lens at any station in the whole line. PTZ cameras at each station perform remote pitch, left-right, and focal length control operations, and set, edit, and modify the preset positions of all PTZ cameras graphically; perform multi-screen display, loop display, or manual selection in color with various programs Display any picture on the monitor and large screen; display the situation where the camera pan / tilt is occupied.
The control terminal of the system center sets the priority of the user to use the PTZ and the camera. Low-level users can operate the PTZ only after the high-priority user releases the PTZ control of the station.
The system digital playback terminal can be adjusted to view any video recording of any station, which can be played back in real time; the station attendant can play back the video data of any image of the station under the authorization of the station. The schematic diagram of the network is shown in Figure 4. .
Program features
Seamless integration of digital and analog
At present, a large number of analog video equipment and digital video equipment will be involved in the subway traffic video surveillance system. Typical analog equipment includes matrix, character superimulator, analog camera, PTZ, multi-screen splitter, etc. Typical digital equipment includes network Video recorder, storage server, security platform server, security management server, interface gateway, disk array, encoder, decoder, digital playback terminal, etc. This solution can integrate these digital and analog devices in one system, so that the two can be interconnected, accessed and controlled.
Third-Party Openness
Provide SDK development kit to make the video monitoring system as one of the subsystems of the integrated track monitoring system (ISCS), fully integrated and unified management and control, increasing the breadth and depth of further application of the video monitoring system.
High standard definition fully compatible
The solution supports HD / VGA / D1 / 4CIF / 2CIF / CIF / QCIF multiple resolutions, the device does not need to correspond to the resolution one by one, and high-definition processing can run through the entire image processing process of storage, forwarding, decoding, and on-demand.
Flexible and intelligent analysis
It can fully combine the intelligent analysis capabilities provided by the front-end camera or encoder to present intelligent behavior detection (cross-line, disappear, appear, count, cross-border), intelligent anti-vandal detection (spraying, virtual focus, shift, occlusion), intelligent audio detection (Sound detection, abnormal sound detection), motion detection, etc.
Safe and reliable
In the system solution, the two sets of video surveillance systems of public security and operation will not have any connection at the IP network level, that is, the two sets of systems are isolated at the IP network level, so that the unique front-end camera security problems of the two sets of monitoring systems are obtained. A good solution greatly improves the safety and reliability of the system.
Strong network management capabilities
Network management can provide users and authority management, equipment management, fault management, network information security management, log management, remote power management, clock synchronization and other functions; so that the maintenance and management capabilities of the video surveillance system have a carrier-level level.
Super compatible management
The system is compatible with IPC / DVS / DVR, access control systems, alarm systems, etc., which are widely used by domestic mainstream manufacturers, and has excellent equipment compatibility and platform management capabilities.
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