来源：http://www.vranime.net/ 点击次数： 发布时间：2019-05-20
Although the metro is not the service scope of Laiwu Security Company, the video surveillance system of the Metro can not be ignored, and the relevant departments should pay attention to it.
With the rapid development of high-definition technology of security monitoring, the sharp improvement of picture clarity and the need for more details, it has been increasingly recognized by the owners of Metro operation, users of metro public security and experts of professional design institutes. This paper discusses how to plan and construct the Metro high-definition monitoring system rationally.
Subway Video Monitoring
1、一类解决计划就是较为熟悉的IP监控 （IP高清监控体系）--以HDTV 规范 支撑720P、 1080i、1080P分辨率画幅16∶9;选用H.264 帧间紧缩方式，实时全帧率。
1. The first kind of solution is the most familiar IP monitoring (IP HD monitoring system) - supporting 720P, 1080i, 1080P resolution 16:9 with international HDTV standards; choosing H.264 inter-frame compression mode, real-time full frame rate.
2. The second kind of solution is the HDTV non-compact monitoring system evolved from the broadcasting industry standard. It mainly uses HD-SDI (1.485G bit/s) high-definition video signal as the interconnection standard of high-definition camera, high-definition optical terminal, high-definition matrix and high-definition display equipment.
3. The third kind of solution plan is a system centered on intelligent vision high-definition camera. High-definition visual camera mainly takes high-definition snapping as its main task. High-pixel CCD is selected as the camera sensor (2 million, 5 million, 8 million, 10 million, etc.). This kind of camera mainly uses intra-frame compression (MJPEG or JPEG2000 picture coding plan) to do high-definition coding without delay or high-compression ratio picture coding without delay. The main drawbacks are that the proportion of pictures is seldom 16:9, the frame rate is between 3 and 15 FPS and the video fluency is poor. The standard of camera interface based on industrial intelligent vision has limitations. It is not suitable for the construction of large-scale planning video surveillance network. There are fewer supporting manufacturers and the camera is valuable.
As can be seen above, HD surveillance is not just a HD camera, but a set of system solutions. The planning and construction of high-definition monitoring system for Metro needs to be based on the characteristics of metro construction and business needs to select solutions.
· First of all, we should consider the characteristics of the Metro industry, clear requirements for the quality of monitoring services; clear system construction planning, whether to support the continued expansion of construction, whether to control and summarize the cost of construction; and whether the reliability of the transaction system does not decline in the case of large-scale planning and deployment.
With the extension of metro lines and the intersection of multiple lines, there is a need for continuous expansion of Metro monitoring. Therefore, the technical openness of the monitoring system is required. At the same time, Party A will strictly control the construction cost of the system.
The application of Metro monitoring requires high quality of pictures, delay of pictures and reliability of the system. No matter how big the system planning is, the delay of any picture coding and decoding must be less than 300 ms. The dispatching time of any picture on the upper wall of stations and monitoring centers and PC terminals should be less than 500 ms. IP HD monitoring system uses the coding skills of H.264 Main Profile and above. The quality of live and video pictures is good, the delay is low, the investment is the lowest, the expansion is simple, the cost is low, and the versatility is good. It is an ideal choice for the operation plan of HD metro.
At present, there are two main IP digital surveillance solutions for Metro video surveillance system: IP streaming media surveillance networking plan and IP full AC digital surveillance plan.
Laiwu Security Company has joined in the field of special security, and has also been engaged in basic security business such as door guard, escort, technical defense and security inspection, so as to build an international first-class domestic top security company.