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  • Network video surveillance is the preferred vehicle monitoring solution

        According to IEC-62580-2 draft, vehicle CCTV video surveillance system must be connected to Train Communication Network (TCN), which live video can be returned to the ground station or a remote control center. This means that, IP video surveillance solution is the best choice, it will likely be the only choice, because it is compatible with IEC-62850 standards of competence. Therefore, system integrators and vehicle manufacturers need to meet future project selection vehicle applications IP video surveillance solution. But usually will find most of the existing IP video products do not comply with vehicle applications, even applications designed specifically for automotive products are rarely able to meet the needs of the new system, as compared to traditional CCTV video surveillance systems, vehicle, different needs, different environments, installation has undergone great changes.
        As for the traditional train communication system, analog cameras and DVR solutions are relatively common, but this is no longer the alternative solutions for the following reasons:
        · It is a closed and independent system, difficult to integrate with other systems, such as PA, fire alarm, emergency telephone networks;
        · Record a video stored on a removable hard drive mainly, so each time you view or backup recording video, you need an administrator to manually replace the hard disk, which is very cumbersome and labor-intensive;
        · Unable to support real-time viewing. When an accident or emergency circumstances, the administrator of the remote control center can not see the specific circumstances of the event, can not respond promptly.
        Use the advantages of IP video surveillance
        In the IP video surveillance system, IP cameras is the focus. Currently, IP camera application has quickly become mainstream, because it is easier to install, manage and integrate, and support for remote access, reducing cabling, with a higher cost. Most importantly, IP video surveillance system can ensure that the entire train system can cope with future years of rapid development.
        Select IP video cameras reasons summarized below.
        1, easy to install and use
        · IP cameras and NVR can be easily connected to the TCN, connected to the train communication network;
        · Compared with analog cameras, reducing cabling. No additional reserve coaxial cable, ideal for space-constrained vehicle conditions.
        IP cameras and NVR can be accessed remotely through the network and management.
        2, high cost
        Compared to the common coaxial cable, the wires for the train is very expensive, because the train with a wire must also have the ability to fire. IP network camera itself is less demand on the cable, most IP cameras also support PoE function, which can greatly reduce the cost of wiring costs and power lines.
        3, easy to integrate
        Train control system has many subsystems to manage these subsystems is very hard. IP cameras can easily be integrated with other subsystems, is also easier with each station control room SCADA system integration, thus greatly enhancing the overall efficiency of the management.
        4, remote access
        IP video surveillance system, the biggest advantage is that which enables remote configuration and access. Anywhere in the world, multiple authorized users can remotely access the network at any time through the live and recorded video.
        How to choose the car with the IP cameras
        The following criteria can be used as a correct selection of IP camera reference.
        1, the design firm
        EN 50155 and IEC 60571 standards for vehicle equipment puts forward the basic requirements, including performance, shock, vibration, temperature and resistance to EMC, ensure that the device can operate reliably in-vehicle environments.
        2, the best video effect
        Resolution, frame rate and video quality is a measure of the performance of several video standards. Video performance higher video quality is more clear, but it also requires higher bandwidth and additional storage needs. As network bandwidth and storage space is limited, the traditional car video surveillance systems can not provide high-definition video surveillance day and night. In the 5-15 per second, the system is commonly used in the resolution of 640 × 480 VGA video; preferred MJPEG format. With HD (1280 × 720) image and the popular H.264 codec, the video surveillance system can provide better video quality, support for higher compression ratio and lower latency. IEC62580-2 standard also recommend the use of HD and H.264 formats.
        3, the image quality
        In order to obtain the best image quality, you should take into account the use of IP cameras have the following conditions:
        · Angle range (FOV): FOV can decide camera "capture image" range, and lens perspective on this. Generally, the lens focal length and installation position (height and angle) is determined by two key factors of the FOV;
        · Illuminance (lux): image quality largely depends on illumination. CCD sensor is usually higher than in low-light environments CMOS sensor for better performance. But recently, CMOS technology has been rapid development of advanced CMOS sensor in low light situations provide the same image quality and excellent CCD sensor;
        · Control parameters: Control parameters include wide dynamic range (WDR), backlight compensation (BLC), Digital Noise Reduction (DNR), White Balance (ATW / AWC), electronic shutter, etc., all of which are designed to enhance image quality, adapt to different environment of the scene. These parameters can also be configured depending on the environment, to ensure the best image quality.
        4, easy installation
        Needless to say, the installation allows system integrators to easily save more time to do more important things.
        · Easy installation: train space is limited, IP cameras installed in two ways: one is surface mounted (mounted directly on the ceiling plane), the other is flush mounted (installed inside the ceiling, only to see some cameras and protective cover);
        · Reduced wiring: PoE power supply wiring can effectively reduce costs, but also need to consider the ground;
        · Compact size: IP camera ideal for installation depends on how much space, and the camera in the end for what you want to use, such as monitoring, prevention of crime. Since most people do not like to be monitored, so the smaller the better the camera´s size, weight, the lighter the better. Of course, the most important thing is to look at the camera itself through vibration EN 50155 standard;
        · Software configuration: Some vehicles may be involved to ten, twenty or even more trains, which means there are hundreds of car you want to install the system. For this reason, be sure to choose easy-to-use software configuration tool, this will save a lot of configuration time and manpower.

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