Notes

The Application of Surveillance System in The Railway
Wireless surveillance systems inside the railway infrastructure must route the applying characteristics as well as special environment. In addition to other monitoring applications,many different special factors need to be considering, like the following:

Preset accuracy

Railway control system, so that you can quickly locate the scene or perhaps response to the alarm, the buyer will most likely create multiple presets for future faster use of applications, preset amount is often no hassle, almost all of the existing camera support 128 as well as 256 preset positions, and actual projects will not use a lot, nevertheless the preset PTZ cameras is to examine the accuracy of the important indicators, such as if the user set a preset, it is often referred to as the future, and a few camera preset position will be offset shift, in order that needed to be manually re-tuning, preset bit lost its meaning, impact on use.

Long-range camera

Another application could be the railway over the railway. Long may must monitor tens of meters out of the camera, a number of hundred meters or several kilometers, then, which means that long-range camera may have to look several kilometers in the effect. Hope is not a simple camera camera longer focal length lens. When the focal length have to be pulled manually control laptop keyboards difficult to find a distant target. In other words, the camera's micro-step control is very important. In addition, high-altitude look camera, anti-shake, night vision lighting complaints are all important considerations.

Natural phenomena

Wind, rain, thunder is a test from the outdoor cameras, each link may cause problems for system maintenance costs soar. The railway project is seen as large span, often similar to finding far, sometimes high over the ground, and also the system running eighteen, you are jobs once opened will face many restrictions, producing increased costs. Therefore, the outdoor camera selection, installation, wiring and high-quality camera itself is particularly important.

Railway infrastructure specialist from the encoder and DVR

High-speed rail projects, the encoder and DVR are generally deployed at various sites scattered from the engine room, therefore, the encoder and DVR needs ultra-stable performance (embedded encoder and embedded DVR is preferred), good networking capabilities, remote management and upgrade capabilities. As the complexity of network systems architecture, large span, routing and more, so the requirement for encoder devices perform using a local cache, a short lived terminal in the network video not lost the situation, as soon as the network is restored on the video supplement towards the NVR storage. In addition, the picture resolution, dual-stream support, two-way audio support, alarm input and output quantity indicators have to be considered.

Coding Standards

At present, the railway project is primarily found in MPEG-4 encoding technology and H.264 encoding technology, the future deployment of AVS could be encoded using intra-frame compression and inter-frame compression to get rid of method of combining video information redundancy punctually and space more than information. Coding equipment delay ought to be lower than 300ms, forward delay each and every level must be under 500ms, the decoding device delay ought to be lower than 300ms, PTZ response latency must be below 500ms, wireless surveillance system monitors the front-end collection devices for the user terminal delay ought not exceed 3s.
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