Notes

The Application of Surveillance System in The Railway
Wireless surveillance systems in the railway infrastructure must route the application characteristics as well as special environment. In addition to other monitoring applications,a variety of special factors should be looking at, for example the following:

Preset accuracy

Railway control system, to be able to quickly locate the scene or even in response to the alarm, the client will most likely set up multiple presets for future faster usage of applications, preset amount is often no hassle, most of the existing camera support 128 as well as 256 preset positions, and actual projects is not going to use so much, nevertheless the preset PTZ cameras is to examine the truth with the important indicators, including in the event the user set a preset, it's known as the future, plus some camera preset position will probably 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 will be the railway down the railway. Long may need to monitor tens of meters outside the camera, a few hundred meters or several kilometers, then, meaning long-range camera may need to look a number of kilometers with the effect. Hope is not a simple camera camera longer focal length lens. When the focal length should be pulled manually control the keyboard difficult to get 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 problems are very important considerations.

Sustainable transport Projects , rain, thunder has been a test in the outdoor cameras, each link could cause harm to system maintenance costs soar. The railway project is seen as a large span, often akin to finding far, sometimes high above the ground, along with the system running eighteen, you are jobs once opened will face many restrictions, leading to increased costs. Therefore, the outdoor camera selection, installation, wiring and high-quality camera itself is particularly important.

Selection in the encoder and DVR

High-speed rail projects, the encoder and DVR are usually deployed at various sites scattered inside the engine room, therefore, the encoder and DVR will need 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 plus more, hence the requirement for encoder devices perform which has a local cache, a temporary terminal inside the network video not lost the case, after the network is restored to the video supplement towards the NVR storage. In addition, the look resolution, dual-stream support, two-way audio support, alarm input and output quantity indicators can be considered.

Coding Standards

At present, the railway project is principally utilized in MPEG-4 encoding technology and H.264 encoding technology, the longer term deployment of AVS could possibly be encoded using intra-frame compression and inter-frame compression to take out technique of combining video information redundancy punctually and space more than information. Coding equipment delay should be below 300ms, forward delay at each level needs to be under 500ms, the decoding device delay ought to be below 300ms, PTZ response latency needs to be less than 500ms, wireless surveillance system monitors the front-end collection devices for the user terminal delay shouldn't exceed 3s.
My Website: https://www.vantoledogroup.com.au/