Xi'an Jmlai Bio-Tech Co., Ltd. , https://www.jmlaisarms.com
Since last year’s “7.23†motor car accident, people’s doubts and concerns about railway safety have never stopped. Today, the speed of the high-speed rail is down, and the voice of questioning is also much smaller than the original. However, in our eyes, high-speed railways, which are high-tech representatives in the field of transportation, are always giving us a little news from time to time. Many people cannot help but ask: Can the high-speed train really not be as reassuring as an ordinary train? Or are we still not adapting to this new technology?
In fact, the operation of the high-speed rail is undoubtedly a pluralistic job. Road conditions, weather, technology, etc. will all have an impact on the operation of the vehicle. At present, although our vehicles have reached relatively advanced levels, due to the constraints of some environments, the use and development of some supporting facilities have been greatly constrained. In the following, we will analyze the difficulties faced by China’s high-speed railways in terms of high-speed rail video surveillance.
In the process of setting up a railway video surveillance system, due to the different geographical environment and application characteristics, there are still many constraints in the construction of high-speed railway video surveillance systems. Among these complex factors, climate is a problem that everyone must pay attention to. Among the causes of the “7.23†incident, the lightning strike was one of the direct causes of this tragedy. For the railway monitoring equipment, the complex outdoor environment is also a great test for the camera. Rain, snow, freezing, too high or too low temperatures can cause camera malfunctions and increase maintenance costs. Especially for China's vast territory and complex climate environment, the requirements for surveillance cameras will rise accordingly. Therefore, the selection and construction of related equipment and the quality of the machine itself are particularly important.
In addition to weather factors, super long-range shooting range is another difficulty in high-speed rail monitoring. Different from the platform, waiting room or computer room. Due to the speed and distance. The surveillance cameras needed for high-speed railways may have a monitoring range of tens of meters, hundreds of meters, and even several kilometers. The lengthening of the observation distance is not just a matter of adding a telephoto lens. It also requires the camera to have better microstep control support. In addition, surveillance cameras have very high standards in terms of anti-shake, fogging, and night vision effects.
In the high-speed rail monitoring, in order to be able to quickly locate the scene or alarm. There are usually multiple presets for calling. The accuracy of the preset position is also an important indicator for monitoring surveillance cameras. However, due to the phenomenon of preset position shifting in the camera, positioning is inaccurate and manual adjustments have to be made. Not only make the preset lost its own meaning, affect the use. At the same time, it also greatly increases maintenance costs.
In the monitoring and construction of high-speed railways, encoders and DVRs also need to have very stable performance and good management capabilities. However, due to the complex network structure, large span, and large routes in the high-speed rail environment, it is necessary for the device to have enough cache capacity so that data will not be lost when the network is temporarily blank. This puts very high demands on the encoder. In addition, the sharpness of the image, the support of two-way audio and video, and the number of alarm circulation also have very high requirements.
Because of the current railway construction in China, MPEG-4 and H are used. 264 coding technology, so the encoding device delay should not exceed 300ms, the forwarding delay is less than 500ms, and the front-end acquisition device to the user needs more than 3ms, which undoubtedly put forward higher requirements for related technologies.
With the continuous acceleration of the railway in recent years, simple manual operation has been difficult to meet the needs of traffic safety. Therefore, this also stimulates the application of smart technologies such as intelligent video analytics. Although only intelligent video analysis technology is currently available on several major pilot roads. However, facing the complex geographical and weather characteristics of the country, if the railway intelligent technology still in the development period is to achieve universal access to the national road network, I am afraid there is still a long way to go.
Today, in the face of many increasingly advanced security equipment, we want to emphasize that security does not equal security. Faced with the current development of science and technology, in the face of more and more ferocious accidents, what we need more is a responsible heart within the relevant personnel. This is the basis for safety. Otherwise, all security facilities may become the biggest hidden danger in our lives.
Today, many units have completely or about to end the Spring Festival holiday and embark on the journey of the new year. For the railway sector, after a short period of “silence,†it will usher in a new wave of “migration.†The security of the railway has once again been brought to the forefront by this huge crowd.