Photo
Video surveillance of Expressway
I. Project Background
Highway has the characteristics of large traffic volume and fast traffic flow. Highway monitoring system is a reliable means to ensure the effective management and maintenance of expressway. Therefore, it is required that the monitoring system can monitor and control the whole Expressway in an all-round and multi-functional way, so that the operation managers can understand and control the operating conditions of Expressway in real time and in an all-round way so as to achieve timely operation. Publish highway traffic information to the public, etc.
II. Solutions
The special monitoring system for expressway can be divided into three parts: front-end part, transmission part and center part. Among them, the front-end part completes image generation and processing; the transmission part completes image information and control information transmission; the central part completes information reception, invocation, management and so on.
2.1 Front End Part
The camera part is the front part of the monitoring system and the "eye" of the whole system. It is arranged in a certain position of the monitored site, so that its perspective can cover the whole monitored parts. The camera part is the original signal source of the system, so the quality of the camera part and the image signal generated by it will affect the quality of the whole system. It is very important to carefully select and configure the camera part.
Equipment selection:
Network high-definition high-speed smart ball: important parts of the highway midway, automatic, manual dynamic adjustment shooting.
Network high definition wide dynamic infrared camera: Lane observation traffic flow and speed, etc.
Enhanced full HD network camera: high-speed toll plaza and other areas.
Contrast effect maps of standard definition, high definition and full high definition
2.2 Transmission Section
In order to ensure the bandwidth requirement for image transmission and real-time storage of network cameras, the special network transmission system for long-distance optical fiber transmission should be adopted in network video monitoring system. The transmission architecture is the "neural network" of the network monitoring system, which guarantees the stability of the system. At the same time, its expansibility should also meet the expansion of the system in the next few years.
In addition, considering that there are remote users and users of higher management units to browse or operate remotely, the relevant configuration of network exit and export security is designed. It is suggested that after the outreach needs are determined, the unified access and exit should use routers to realize network interconnection and set up firewalls to ensure network security.
All cameras use two power supply modes: one is the conventional power supply of 220V AC, the other is the solar power supply of 24V DC, while the camera network wiring is also wiring. For the integrated high-speed pan-tilt camera, the maximum power is not more than 30W, and the power supply line is RVVP3*2.0.
2.3 Central Part
The central part is the application center of the system, including the system control part, storage part and display part.
2.3.1 Control Section
The control part is the "heart" and "brain" of the whole system. It is the command center to realize the function of the system. Generally, there are general control center and sub-control center.
The team monitoring center is the control center with the highest authority. It controls all the sub-control centers and front-end cameras. In the monitoring center, the image of any monitoring point can be switched to achieve the command and dispatch function.
The monitoring sub-center directly controls the image information of each monitoring point and can access the monitoring image of other videos.
According to the actual needs, the monitoring center configures the digital video matrix, which can dispatch and switch any image to the TV wall.
Each monitoring center has different requirements for the control part, so we must equip the control part of each monitoring center according to different situations.
The main components of the control part of the general monitoring center are as follows:
(1) System Management Platform
According to the actual situation of the monitoring center, the second generation of high-definition network video monitoring management system BPH-V100 introduced by Shenzhen Dewitek Digital Technology Co., Ltd. is selected. The system is constructed with a new data engine and three-tier architecture, and supports the access, management, control and setup of various video capture hardware. It is designed for the digital high-definition network video monitoring environment, using modules. Component mode, including device centralized management system, network video storage system, alarm and police service system, digital video matrix system, streaming media video forwarding mechanism, user rights management mechanism and other functional modules, is a necessary central management service platform for medium and large-scale high-definition monitoring system.
Functional characteristics
1. Humanized interface is easy to operate.
Software operation interface is friendly. Quick toolbar is used instead of right-click menu, which reduces the menu series, simplifies the complicated operation process, enables users to quickly start, and improves the operability of the system.
2. Modular structure is flexible and changeable
The software of management platform is flexible, and it can adapt to different scale monitoring system through the combination of functional modules. It not only meets the simple needs of small monitoring projects, but also can easily upgrade to large and medium-sized centralized monitoring system.
3. Strong centralized management function
Through the management platform software, we can configure remote parameters, remote video control, remote host working status detection, alarm reporting and other centralized management (remote deployment and withdrawal of defense, network virtual matrix, etc.) for digital network camera (IPC), video encoder (DVS), network video storage server (NVR), high definition video decoder (DVM) and other products in the network. Storage management and so on, give full play to the advantages of centralized management of digital network monitoring system.
4. Reasonable and Perfect User Rights Management System
Management platform software provides an effective decentralized and decentralized user rights management model, reasonable priority and conflict detection mechanism, users can create different administrator privileges.
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