For a long time to come, environmental pollution will become the embarrassment of the sustainable development of many cities in China. At present, the construction of sewage discharge systems in many cities lags behind, and pollutant emissions only increase or decrease, directly affecting people's normal life and social and economic operations. Now urban environmental protection is not "want", but "how." In addition to the transformation of economic development mode, high-definition video surveillance also provides a way out for urban environmental protection.
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background
With the development of urban politics, economy, culture and social progress, people have put forward new requirements for the management of urban environmental sanitation and urban sewage treatment. Therefore, using advanced science and technology to build an intelligent, network-based, digital, and secure integrated management system to improve the efficiency of urban environmental protection management, effectively crack down on illegal criminals, strengthen urban sewage control, and ensure the people's The safety of life and property, improving people's living standards and urban security, and improving people's satisfaction and city image are of great significance to the urban environmental protection department.
demand analysis
The application of urban environmental monitoring system is quite special. It is mainly used to monitor urban sewage outlets and related enterprises' sewage discharge status and sewage video forensics to strengthen urban sewage control and pollution enterprise rectification.
· Monitoring and video evidence of sewage conditions requires high image quality and clarity, using a million high-definition cameras for high-definition monitoring of sewage conditions and resolution of subtle changes in emissions;
· The front-end camera is required to implement remote TCP/IP network management such as remote network management, remote call, remote configuration, etc. The back-end system is easy to deploy, control and maintain;
· Consider the factors of remote transmission bandwidth cost and network transmission interruption leading to the loss of central recording. Local recording and center free backup recording should be designed. On the one hand, it saves uplink bandwidth, on the other hand, it avoids loss of video recording due to network interruption;
· The County Environmental Protection Bureau and the Municipal Environmental Protection Bureau require the formation of a subordinate management model, and the County Environmental Protection Bureau serves as the client of the Municipal Environmental Protection Bureau. All clients are uniformly authorized by the city bureau monitoring center to realize hierarchical and decentralized management. At the same time, the municipal office client has the priority to control and unify the authority of the county bureau to improve the efficiency of management;
· The city environmental protection bureau should reserve interfaces to facilitate the system to network with other public security business systems, realize resource sharing, improve the coordination between urban law enforcement agencies, improve comprehensive management capabilities and quickly resolve emergency response capabilities.
Design
Figure 1 Environmental Protection Agency Monitoring Center Topology
Front end design
1. Each monitoring and discharging point adopts 1.3 million high-definition network infrared ball machine (installed by vertical pole and outdoor box) as a panoramic monitoring sewage outlet; 2 million high-definition network gun machine (installed by pole and outdoor box) as sewage Close-range monitoring.
2. Deploy a small NVR product at the front of each monitoring blowdown point, with 2 2T enterprise-class hard disks, storage time is more than half a month (expandable), and important video evidence is backed up to the local disk of the city bureau for long-term storage.
3, the front end to do lightning protection grounding protection measures, the use of network power two-in-one lightning protection device. The pole is grounded and the grounding resistance is no more than 4 ohms.
4. The above high-definition IP cameras and NVRs are networked with the municipal bureau through the IP network to realize data storage management and remote video viewing.
Network design
1. The pollution monitoring point uses fiber optic transceivers to converge through the optical fiber to the county environmental protection bureau and access the county environmental protection bureau aggregation switch.
2. The county environmental protection bureau's aggregation switch is connected to the core switch of the municipal bureau through the optical interface through the optical interface to realize data exchange.
Backend design
1. Deploy a set of video management platform software and server and a set of streaming media software and server in the monitoring center of the city bureau to conduct real-time video browsing, video switching and viewing, video decoding on the wall management, large screen display, etc. Management of video free backup storage (storage expandable).
2. Design a client in the county environmental protection bureau. After the client is assigned and authenticated by the video management platform server of the city bureau monitoring center, the county environmental protection bureau gathers the switch to access the video monitoring system resources of the environmental protection bureau, including the front-end video. Video playback, pan/tilt control, camera configuration, etc.
3. Multiple clients can be designed in the city bureau. After the client is assigned and authenticated by the video management platform server of the city bureau monitoring center, the video monitoring system resources of the EPA can be accessed through the core switch of the municipal bureau or the intranet of the EPA. , including front-end video, video playback, PTZ control, camera configuration, etc., permissions take precedence over county bureaus.
4. The monitoring center design cabinet, TV wall, console, platform server, streaming media server, power distribution system, grounding system, etc.
Functional design introduction
Video management platform features
The network video management platform software has powerful management capabilities, and can realize centralized maintenance and management of video devices such as user cameras, DVR/NVR products, and central decoding on the wall, and realize unified command and management of user security. An open SDK interface and interface protocol that supports access to any third-party system. Its core functions and application features include:
1, image browsing function
· The client software can support 4 monitors, each monitor can support 16 screens, 4 screens can support up to 64 screens, support multi-screen split and round robin;
· Support local enhancement of screen image to ensure better image display in complex environments such as foggy and rainy;
· Support partial zoom function, you can easily get a clear picture of the part in the megapixel camera image;
· Support personalized layout definition and set patrol group, support manual or automatic switching between layouts or patrol groups, which is convenient for users to browse in different ways.
2. Multi-level electronic map
Support multi-level vector electronic maps, from the city to the district and then to the town/township to the monitoring point. The electronic map can be used to visually display the monitoring location and monitoring points. The camera can be searched according to the actual physical location and the video screen can be viewed. At the same time, when the alarm occurs, the alarm location can be identified on the map, and the location can be quickly and accurately located. The actual location of the alarm (as shown in Figure 2).
Figure 2 multi-level electronic map
3, video playback function
· Support video playback speed control, there are a variety of playback speeds to choose from, so that users can view the video details;
· Support timeline drag and drop, second level query, single frame playback, which can be accurately positioned to view the screen;
· Support bookmark management (Figure 3), and snapshot index (Figure 4), which is convenient for users to record and find the desired picture.
Figure 3 bookmark management
Figure 4 snapshot index
4, platform-level alarm linkage
When any node alarm occurs, the camera, PTZ control, video recording, switch quantity, etc. can be triggered on the platform side, and the user can be quickly notified by information prompt, guest voice prompt, and image pop-up. In addition, The system also automatically records alarm events and camera numbers and writes them to the log. The linkage alarm delay is no more than 200 milliseconds. Realize platform-level, system-level alarm linkage and unified emergency command management.
5, system security management
Support multi-level rights management and user authentication mechanism, different users divide different permissions, including lens grouping, function setting, PTZ control and so on.
6, decoding management
· Support standard H.264 High Profile 4.2 video compression format decoding;
· Support HDMI, VGA, BNC three output modes, convenient for users to choose;
· Support 1 screen / 2 screen / 4 screen / 6 screen video segmentation, support digital matrix, screen round robin.
Streaming function
1, stream distribution features
Flexible scheduling strategy: According to the network bandwidth, the distribution path of the video stream is reasonably selected. When the load is small, the direct connection mode of the video server to the client can be preferentially selected, and the optimal use efficiency is achieved under complicated network conditions.
Polar distribution mechanism: According to the video server access, the multi-pole distribution mechanism is used to solve the problem that multiple users pay attention to one camera at the same time.
Low latency, high image quality: Combines mature network transmission protocols, video encoding technology and video return control technology to provide smooth, high quality images.
Strong distribution ability: At the same time, the stream distribution bandwidth is 456Mbps, which can meet the basic needs.
2, IO function
· Support 200Mbps video simultaneous writing;
· Support 256Mbp video forwarding.
3, network function
· Dual Gigabit Ethernet ports are used to support network port binding.
· Adopt network bandwidth adaptive flow control technology to automatically select the appropriate code stream according to the specific network environment.
Client function
The monitoring personnel can realize the following functions through the video monitoring client: real-time browsing and switching of video, wall display, remote control, video recording, video playback, real-time browsing, intelligent retrieval, etc.; all clients are authorized by the municipal monitoring center to be authenticated. Realize the hierarchical decentralization management, and at the same time, the municipal bureau client has the priority to control and unify the authority of the county bureau to improve the management efficiency.
Conclusion
With the increasing demand for harmonious homes and harmonious society and the continuous upgrading of advanced technologies and advanced equipment, automated real-time monitoring has become a reality, and environmental security and management have also reached a new level. We have reason to believe that a flexible network framework will lay a good foundation for future updates and replacements, and ubiquitous monitoring provides more convenience for environmental security.
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