High-speed rail video surveillance system must see five major requirements

[ Huaqiang Security Network News ] When installing the railway video surveillance system, it is necessary to look at the five major requirements. According to the characteristics of the line application and the particularity of the environment, special factors other than the conventional monitoring application systems should be considered, such as the following aspects. :

1. Natural phenomena such as wind and rain and lightning Wind, rain, thunder and electricity bring great challenges to outdoor cameras, such as rain, snow, high temperature, low temperature, lightning strikes, strong winds, etc. Each failure link may cause system maintenance costs. The number of railway projects is characterized by large spans, often high mountains and high roads, and sometimes high-altitude operations, and once the system is opened for operation, it will encounter many restrictions, resulting in increased costs. Therefore, the selection, installation, wiring and quality of the camera itself are especially important.
2, long-distance camera problem High-speed rail monitoring, according to the points are mainly divided into indoor computer room, indoor waiting room, ticket office and outdoor square, platform, etc., there is no special special place for camera deployment in these locations, but another point More applications are along the railway, the long-distance railway is the absolute use of long-range cameras. Long-range cameras may need to monitor tens of meters, hundreds of meters or even several kilometers, which means that long-range cameras may need to be several The effect of the kilometer. Looking at the camera is not a simple camera with a long focal length lens. Simply put, when the focal length is pulled to a certain length, the manipulation of the manual keyboard is difficult to locate a target far away, that is, the micro-step control function of the camera is very important. In addition, high-altitude cameras, anti-jitter, night vision lighting issues, etc. need to be considered.
3, preset accuracy In high-speed rail monitoring, in order to quickly locate the scene or respond to the alarm, usually the customer will set a number of presets for quick call applications in the future, the number of presets is usually not a problem, most cameras currently support 128 Even 256 preset positions, and the actual project will not use so much, but the accuracy of the preset position is an important indicator for examining the PTZ camera. For example, when the user sets a preset position, it is usually called later. The camera preset position will be offset, so you have to manually fine-tune it again, losing the meaning of the preset position itself and affecting the use.
4. Selection of encoders and DVRs In high-speed rail projects, encoders and DVRs are usually deployed in various workstations. Therefore, encoders and DVRs need to have ultra-stable performance (embedded encoders and embedded DVRs). Is the preferred), good networking capabilities, remote management and upgrade capabilities. Due to the complex architecture, large span, and many routes of the network system, the encoder device needs to have a local cache function, and the video will not be lost in the case of the network temporary terminal. Once the network recovery can supplement the video to the NVR storage. In addition, image clarity, dual stream support, two-way audio support, and the number of alarm inputs and outputs are all indicators to consider.
5, coding standards At present, the railway project mainly uses MPEG-4 encoding technology and H.264 encoding technology, in the future may deploy AVS encoding, using intra-frame compression and inter-frame compression combined to remove video information Redundant information in time and space. The delay of the coding equipment should be no more than 300ms, the forwarding delay of each stage should be no more than 500ms, the delay of the decoding equipment should be no more than 300ms, and the delay of PTZ response should be no more than 500ms. The delay of the system front-end acquisition equipment to the user monitoring terminal should not be More than 3s.

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