Tag: Video Surveillance Compressed Light Platform
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In the construction planning of the safe city monitoring system, due to the factors of capital investment and system scale, the construction speed and design scheme of each place are not the same. In the previous scheme, video optical transceivers, analog matrices, and DVRs were used, and the monitoring products based on network IP technology were gradually adopted in the later stage. Various schemes have their advantages, but they are relatively independent. This leads to the incompatibility of hardware and software caused by equipment access from different manufacturers, which makes various schemes impossible to implement. Therefore, how to integrate these independent systems to make their resource sharing and unified scheduling become the urgent problems to be solved.
Design Basis
Urban security monitoring is based on the principle of “advanced, reliable, safe, long-lasting and economicalâ€. First of all, whether in software design or hardware structure and technical indicators, it must have its distinctive features; secondly, the quality must be reliably guaranteed, so that its failure rate is effectively reduced; the third must be "less money, The principle of “doing more work and doing good things†minimizes economic input; the fourth guarantee system technology is advanced, and it requires product manufacturers to provide perfect post-maintenance and timely software upgrades to keep the system at an advanced level for a long time.
Overall planning
The access method of “analog camera + video optical transceiver + matrix + DVR†adopted by Ping An City still has a considerable market share. Therefore, the overall planning scheme of the latter stage also needs to consider the compatibility of access schemes with different networking modes in different periods. And integration.
In view of the actual demand, the following solutions are proposed: multi-level multimedia management system, external field analog camera or high-definition HD-SDI camera can access the remote optical access platform device (can support HD or SD video signals at the same time), compression-coded After that, it is transmitted through the Gigabit optical port Ethernet channel or directly through the private network. The use of compressed video transmission will also greatly reduce the overall transmission bandwidth, even if it is transmitted through the public network VPN will not take up too much resources. As long as the communication of the network is normal, the multi-level system can manage the front-end access equipment accordingly.
Ping An City Video Surveillance System Transmission Solution
Currently, the compressed optical platform adopts a standard SIP (Session Initiation Protocol) session initiation protocol, which is an application layer signaling control protocol. By using this protocol, the overall network can be formed more reasonably, and the integration of the entire system resources can be more rational and efficient. The multimedia management system with monitoring video as the core can smoothly connect and seamlessly schedule its integrated services. The system can be hierarchically hierarchical, and the inter-stage connection protocol uses standard SIP signaling. The system uses the camera and monitor as the main application clues, and is compatible with the access of video uncompressed devices and video compression devices of different manufacturers. The whole system is derived from work practice, with clear structure and complete functions. According to the regional level topology, the monitoring information resources are shared and the functions such as device compatibility are met.
Hierarchical structure and function
Through the responsibilities of all levels of systems, the main work content and the detailed discussion of the required hardware and software equipment resources, a clear introduction to the safe city monitoring system is mainly based on monitoring video resources, while supporting audio intercom, events Architecture for multi-level multimedia integrated service processing for detection and data processing.
Total monitoring center
Functional description
The monitoring center is the core dispatching center of the system, and is also the core node gathering place for audio and video streaming and data control. It must meet the access, control, storage, management, distribution, and access of local user terminals in a wide range of audio and video information. Control the release and response of data. The monitoring center has the highest level and authority.
main effect
1. Receive the registration of the regional sub-center, and receive the node information report from the device belonging to the regional sub-center, and write the information into the database of the SIP server of the monitoring center.
2. When requesting real-time video surveillance and PTZ control, the real-time video and PTZ control requests are 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 is corresponding. Real-time video is forwarded to the total monitoring center for playback and the corresponding PTZ control requirements are completed.
3. Send an alarm reservation request to the registered road level center to schedule an alarm event required by the central center and receive an alarm message from the regional center.
4. When on-demand historical video, select the recording storage node information in the database of the total monitoring center SIP server to send a historical video file list request and an on-demand request to the regional center where it is located, receive the video stream and play it, and fast forward during playback. Rewind, slow broadcast stops. The upper and lower level session communication is completed based on the monitoring network of the SIP protocol specified by the relevant standard.
Equipment composition
The total monitoring center system is mainly composed of exchange control equipment, user terminals and integrated optical transmission platform equipment. Switching control devices include SIP servers and large network switches. User terminals mainly include network video matrix, display, client software, large-screen TV, and video wall. The integrated optical transmission platform device is mainly responsible for decoding audio and video streams, controlling data input and output or optical access.
Regional center
Functional description
The regional-level central monitoring center is the secondary monitoring center of the system, which is used for the access, control, storage, management, distribution, access of local user terminals, and the release, response and upload of control data in the area. The work within the jurisdiction of the regional level center also undertakes to forward real-time data, signaling response to the general monitoring center, and accept the management of the total monitoring center.
main effect
1. Receive registration of the SIP gateway from the access layer, and receive information reporting from the access layer device node, and write the information into the database of the SIP server to which the regional level belongs.
2. When the regional level requests real-time video monitoring and PTZ control, etc., the real-time video and PTZ control request is 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 an alarm message from the SIP gateway in the toll booth/tunnel monitoring station at a predetermined alarm event required at the regional level.
4. When the historical video is requested, the video storage node information in the database of the regional SIP server is selected to send a historical video file list request and an on-demand request to the access layer SIP gateway, and the video stream is received and played, and the playback process can be fast. Rewind and slow down.
5. If other regional level at the same level wants to adjust or control the monitoring business at this level, it needs to register with the center.
Equipment composition
The road-level central subsystem is composed of an exchange control device, a user terminal, and an integrated transmission optical platform device. Switching control devices include SIP servers and large network switches. The SIP server is mainly responsible for cascading devices from the upper and lower levels, and can implement signaling control and user management of the entire system, and forwarding and uploading of audio and video data streams, and control data; the user terminal mainly includes a network video matrix and a display. , client software, big screen TV, TV wall. The integrated transmission optical platform device is mainly responsible for decoding audio and video streams and controlling the input and output of data.
Service access layer
Functional description
The service access layer is responsible for accessing, compressing, storing, managing, and uploading peripheral monitoring resource information, and accepts the management of the superior center.
main effect
1. Access layer The SIP gateway is responsible for implementing the control commands and video data transmission and conversion functions in the networking process. It registers with the regional level monitoring center in the name of the access layer, and reports all device node information in its jurisdiction to the regional monitoring center. At this time, the regional-level 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 grading center selects the recording 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, and completes the streaming of the historical video.
4. Only the regional-level sub-center registered by the access layer platform SIP gateway has the right to send various command requests to the access-layer platform SIP gateway.
5. The SIP gateway of the access layer platform has the communication capability of unified data format and protocol conversion, and can realize the conversion of different system structures, different coding standards and communication protocols. It provides seamless access to devices such as integrated optical platform equipment, PTZ cameras, HD cameras, and video storage servers within its jurisdiction.
Equipment composition
Access layer deployment equipment includes SIP gateways, integrated optical platform equipment, network switches and alarm detection equipment, video storage servers, analog matrices, cameras, pan/tilt, pickups, speakers, etc., DVRs.
Application introduction
In the application of multi-level multimedia management system, combined with current software and hardware products and launched a complete application solution. From the service layer accessed by the device to the connection of the regional center, and then to the cascading of the central management system, the monitoring information resources are shared and the functions such as device compatibility are met.
In the specific implementation of networked transmission, the hardware and software required for the total monitoring center, area and center, and access layer:
· Hardware equipment: Ethernet switch, integrated optical transmission platform, gateway, streaming media server, SIP server, etc.;
Software module: media dispatch server software, device gateway server software, video server software, network video matrix control software, monitoring front end, video browsing software, video wall service software, etc.
Conclusion
This set of network video surveillance system is essentially different from traditional video surveillance. It realizes a true digital network transmission image with powerful scalability. It can be installed at any location where the network can reach to achieve video transmission. purpose. Compared with the analog monitoring system, the cost of the expansion system is greatly reduced.
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