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The first stage: the early period of liberation to the end of the 1970s. In the past 30 years, due to the severe impact of economic development at that time, the train was still being driven by the oldest steam locomotive. At that time, the railway protection was mainly monitored through the monitoring of the flow of railway staff.
The second stage: the 1980s to the end of the 1990s. This is a period of rapid development of China's railway industry. During this period, internal combustion and electrified locomotives were mainly used as traction power for trains. In order to ensure the safe operation of the railway, analog video technology is used for monitoring in the waiting rooms, platforms, ticket offices, and freight stations in oversized stations.
The third stage: the early 20th century to the present. This is the period of rapid development of China's railway industry. It uses the most advanced electric locomotives made in China as the traction power for trains; the high-speed railways have been successively opened and operated; China's railways have undergone many major speed-ups; and railway comprehensive video surveillance systems are rapidly being developed by analog video technology. Digital-analog combined with current networked digital video technology.
Problems with the development of railway video surveillance:
System specifications are not uniform
It is reported that all major industries and departments have introduced or are brewing their own specifications, which led to the diversity of video encoding and decoding standards. The absence of strong specifications for the system data exchange links has allowed manufacturers to develop their own proprietary algorithms under the current international coding and decoding standards (such as H.264 and MPEG4 and MJPEG), and each company has packaged each video signal during the compression process. The principles and methods are different, the variety is numerous, the standards are not the same, and the functions are different. The products of different manufacturers are not compatible and the interoperability is not strong. If a company's products are used early in the project, it is easy to form a monopoly, which is not conducive to the long-term monitoring system. Steady development, maintenance and expansion.
Low level of integration
The scale of comprehensive railway video surveillance systems is increasing. The system needs to be further integrated with intruder alarm systems, fire alarm systems, access control systems, and power monitoring systems. This makes integrated video surveillance systems more complex and traditional islands. The system will not be able to meet the deep development of the system application. Only by gathering, processing, and transmitting various system data through the network, can the function of the system be deeply tapped, and the integration of the integrated video surveillance system of the railway can be improved.
Low intelligence
The number of railway passengers, the situation is relatively complex, and there are many monitoring points, so it is difficult to rely solely on manpower to respond to various unexpected situations in a timely and correct manner. Through intelligent video analysis technology, high-speed analysis and understanding of video images can be performed, thereby completing functions such as traffic statistics, crowd detection, face recognition tracking, automatic alarm, and monitoring linkage. This greatly reduces the workload of personnel and improves system performance. Accuracy and timeliness.
Poor sharing
As we all know, the railway video surveillance system involves many business departments, such as the *, traffic section, locomotive section, dispatch section, service system, passenger section, freight section, etc. all have their own unique video surveillance needs, due to the obvious division of the railway sector professional, The relevance of various professions is relatively low, and the video surveillance system adopts the principle of “who is responsible for construction and who is responsible for it.†Therefore, the interface between the Ministry of Railways, the railway bureau, and related stations and the railway information application system is reserved to strengthen the existing video. The integration of resources in order to play a greater role in the railway integrated video surveillance system.
The artificial inorganic fiber made of rock wool board by high temperature melting process has the characteristics of light weight, small thermal conductivity, heat absorption and incombustibility. The initial development is a common type of application in construction, which is mostly used in industrial buildings. It should meet the requirements of "Application Types and Basic Requirements of Building Thermal Insulation Materials". Rock wool is a kind of external insulation material. When the market share of 90% of the organic thermal insulation materials is stagnant, rock wool, as an inorganic thermal insulation material for exterior wall, has ushered in an unprecedented market opportunity.
Four Problems Faced by Railway Video Surveillance System
The development of China's railway monitoring has continued to rise with the development of the entire railway industry. Since the founding of New China, it has gone through three stages.