Analysis of the Safe City Video Surveillance System

In the construction plan of the safe city monitoring system, due to factors such as capital investment and system scale, the construction speed and design plan of each place are not the same. In the early stage, more video optical transceivers, analog matrix, and DVRs were used, and monitoring products based on network IP technologies were gradually adopted in later stages. Various programs have their advantages, but they are relatively independent. This leads to the incompatibility of software and hardware caused by equipment access from different manufacturers, resulting in the inability to implement multiple solutions. Therefore, how to integrate these independent systems so that their resource sharing and unified scheduling have become urgent problems to solve.

Design Basis

Urban security monitoring is based on the principle of “advanced, reliable, safe, long-term, and economical”. First of all, whether in software design or hardware structure and technical indicators, it must have its distinctive characteristics; secondly, quality must be reliably guaranteed, so that its failure rate can be effectively reduced; and thirdly, it is necessary to spend less. The principle of “doing more things and managing good things” minimizes economic investment. Fourth, ensuring the advanced technology of the system requires product manufacturers to provide comprehensive post-maintenance and timely software upgrades to keep the system at an advanced level for a long time.

Overall planning

The access method of “Analogue Camera + Video Optical Terminal + Matrix + DVR” used in the early period of Ping An City still occupies a considerable part of the market share, so the overall planning plan in the later period also needs to consider the compatibility of access schemes with different networking methods in different periods. And integration.

In view of the actual needs of the proposed solution - multi-level multimedia management system, field simulation cameras or high-definition HD-SDI camera can be accessed to the nearest remote optical access platform equipment (which can support high-definition or standard-definition video signals), compressed encoding After that, it is transmitted through a Gigabit optical Ethernet channel or directly transmitted through a private network. The use of compressed video transmission also results in a significant reduction in the overall transmission bandwidth. Even if it is transmitted via public network VPN, it will not occupy too much resources. As long as the network communication is normal, multi-level systems can manage the front-end access devices accordingly.

Safe City Video Surveillance System Transmission Solution

At present, the compression optical platform adopts a standard SIP (Session Initiation Protocol) session initiation protocol, which is an application layer signaling control protocol. Using this protocol, the overall network can be set up more rationally, and the overall system resources can be integrated more reasonably and efficiently. The multimedia management system with monitoring video as the core can smoothly integrate and seamlessly schedule integrated services. The system can be hierarchical, and the inter-class connection protocol uses standard SIP signaling. The system uses cameras and monitors as the main application clues and is compatible with video non-compression devices and video compression devices from different vendors. The entire system is derived from work practices, with a clear architecture and complete functions. It also realizes the sharing of monitoring information resources according to the regional hierarchical topology and meets the requirements of equipment compatibility and other functions.

Hierarchical architecture and functions through the responsibilities of the system at all levels, the main content of the work completed as well as the detailed description of the hardware and software equipment required, a clearer description of the monitoring system in the safe city to monitor video resources, while supporting audio Intercom, event detection, and data processing architecture for multi-level multimedia integrated service processing.

General monitoring center

Functional Description The monitoring center is the core dispatching center of the system, and is also the convergence point of audio and video streams and data control core nodes. It must satisfy the access, control, storage, management, distribution, and local user terminal access of audio and video information in a wide range. Incoming and control data release and response. The monitoring center has the highest level and permissions.

The main role of 1. Receiving regional center registration, and receive the information from the regional level sub-center equipment node information reported to the monitoring center SIP server database.

2. When requests for real-time video surveillance and PTZ control are requested, the request for real-time video and PTZ control is sent to the regional center where the camera is located by selecting the node information of the camera recorded in the database, and the regional center will The real-time video is forwarded to the general monitoring center for playing and the corresponding PTZ control requirements are completed.

3. Send an alarm reservation request to the registered road level center to subscribe to the alarm event required by the general center and receive the alarm message from the center of the district level.

4. On-demand historical video, select the video storage node information in the database of the SIP server of the general monitoring center to send historical video file list requests and on-demand requests to the regional center where it is located, receive the video stream and play it, and it can be fast forwarded during playback. Retreat, slow broadcast stops. The upper and lower session communication is completed based on the monitoring network of the SIP protocol specified by the related standards.

The equipment consists of a total monitoring center system consisting mainly of switching/control equipment, user terminals and integrated optical transmission platform equipment. Exchange \ control devices include SIP servers, large network switches. The user terminal mainly includes an online video matrix, a display, client software, a large-screen television, and a video wall. Integrated optical transmission platform equipment is mainly responsible for the decoding of audio and video streams, control data input and output, or optical access.

Regional Center

Functional Description The regional center monitoring center is the secondary monitoring center of the system. It is used to access, control, store, manage, distribute, access the local user terminal, and control data release, response and upload. . The work within the jurisdiction of the regional center also bears the responsibility of forwarding real-time data and signaling responses to the general monitoring center and accepting the management of the general monitoring center.

The main role of 1. Received from the access layer of the SIP gateway registration, and receive information from the access layer device node information, the information is written to the regional level SIP server database.

2. When the regional level requests real-time video surveillance and PTZ control, etc., the real-time video and PTZ control requests are sent to the access layer where the camera is located by selecting the node information of the camera recorded in the database.

3. Send an alarm reservation request to the registered access layer SIP gateway to receive the alarm message from the SIP gateway in the toll station/tunnel monitoring station with the alarm event required at the predetermined area level.

4. When the historical video is ordered, the information of the video storage node in the database of the regional SIP server is selected to send the historical video file list request and the on-demand request to the access-layer SIP gateway where it is located, and the video stream is received and played. The playback process can be fast. Retreat quickly and stop slowly.

5. If other regional levels at the same level want to view or control the level of monitoring business, they need to register with the center.

The equipment consists of a road-level central subsystem consisting of an exchange, a control device, a user terminal, and an integrated transmission optical platform device. Exchange \ control devices include SIP servers, large network switches. The SIP server is mainly responsible for the cascading of devices from the upper and lower levels, and can implement signaling control and user management for the entire system as well as forwarding of audio and video data streams, control data delivery, and uploading; the user terminals mainly include network video matrices and displays. , client software, big screen TV, video wall. The integrated transmission optical platform equipment is mainly responsible for the decoding of audio and video streams and the input and output of control data.

Service access layer

Function Description The service access layer is responsible for the access, compression, storage, management, and uploading of peripheral monitoring resource information, and accepts the management of the superior center.

The main role 1. Access layer SIP gateway responsible for the realization of the control process in the networking process and video data transmission and conversion capabilities. It registers with the regional monitoring center on behalf of the access layer and reports all device node information within its jurisdiction to the regional monitoring center. At this point, the regional monitoring center can only see which access layer the reporting device belongs to, and does not know which encoder the device belongs to.

2. When the regional center selects the camera and sends a real-time video or PTZ control request to the access layer platform, the access layer platform forwards the request message to the encoder where the camera is located.

3. When the regional center selects the video storage node to send a historical video request to the access layer platform, the access layer platform SIP gateway forwards the request message to the video storage server, which completes the streaming of the historical video.

4. Only the regional level center registered by the access layer platform SIP gateway can send various command requests to the access layer platform SIP gateway.

5. The SIP gateway at the access layer platform has a unified data format and protocol conversion capabilities, enabling the conversion of different system architectures and different coding standards and communication protocols. It seamlessly accesses integrated optical platform equipment, PTZ cameras, high-definition cameras, video storage servers and other devices within its jurisdiction.

Equipment Components The access layer deployment equipment includes SIP gateways, integrated optical platform equipment, network switches and alarm detection equipment, video storage servers, analog matrix, cameras, heads, pickups, speakers, and DVRs.

Application Introduction In the application of multi-level multimedia management system, combined with current hardware and software products, a complete set of application solutions has been introduced. From the service layer connected to the device to the regional center, and then to the overall central management system, the cascaded monitoring information resources are shared, and functions such as device compatibility are fulfilled.

In the specific implementation of networked transmission, the hardware and software required for the overall monitoring center, area and center, and access layer:

Hardware devices: Ethernet switches, integrated optical transmission platforms, gateways, streaming media servers, SIP servers, etc.

Software modules: media scheduling server software, device gateway server software, video server software, network video matrix control software, monitoring front-end, video browsing software, and video wall service software.

Conclusion

This set of network video surveillance system is essentially different from the traditional video surveillance system. It realizes a truly digital network transmission image and has powerful extensibility. In any location where the network can reach, it can install front-end equipment to achieve video transmission. purpose. Compared with the analog monitoring system, the cost for expanding the system is greatly reduced.

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