Changchun video surveillance system is booming

At the leading group (expanding) meeting of the Changchun video surveillance system construction held recently, the administrative committees of the counties (cities, districts) of Changchun City and the Development Zone submitted a letter of responsibility to the municipal government and set up a "military order" - Changchun. The city launched the fourth phase of the video surveillance system. The video surveillance system is an integral part of the security system. It is a comprehensive system with strong prevention capabilities.

Video surveillance is widely used in many occasions for its intuitive, convenient, and informative content. Through the history of video surveillance development, we can see that video surveillance systems are not only powerful but also widely used. Such powerful functions are accumulating in the long development history.

Changchun video surveillance system construction from the city to the rural development For this year's video surveillance system construction of the main tasks, Changchun mayor Jiang Zhiying summed up in four "key words": "reform." Through the maintenance, transformation, matching and other methods, the video surveillance system to further improve and upgrade to ensure that the monitoring probe can be used, easy to use, effective; "perfect".

Focusing on major traffic areas, key locations, key areas, and complex locations, large-scale crypto-complementary points will be focused on, and as soon as possible, there will be a substantial improvement in public probe monitoring coverage; Actively promote the construction of video surveillance systems from cities to rural areas; "upgrade." The functions of the platform were upgraded to form a centralized command center of the Municipal Public Security Bureau, based on the monitoring centers of the districts and counties, supplemented by social monitoring systems, and covered the city's monitoring system network.

Dialysis video monitoring working principle For video surveillance systems, according to the different functions of the various parts of the system, the entire video surveillance system is divided into seven layers - presentation layer, control layer, processing layer, transport layer, execution layer, support layer, acquisition layer. Of course, due to the increasing integration of devices, for some systems, some devices may exist in the system as multiple layers at the same time.

First, the performance layer The performance layer is the most intuitive to us, and it shows the quality of the entire video surveillance system. Such as monitoring video wall, monitors, high pitch alarm horns, automatic alarm answering calls, etc. belong to this layer.

Second, the control layer The control layer is the core of the entire video surveillance system, it is the most clear embodiment of the system technology level. Usually we have two kinds of control methods - analog control and digital control. Analog control is an early control method. Its console is usually composed of a controller or an analog control matrix and is suitable for a small local video surveillance system. This control method has a lower cost and a lower failure rate. However, for medium to large-scale video surveillance systems, this approach is complicated to operate and does not have any price advantage. At this time, we are more sensible choices should be digital control. The digital control is the control core of the industrial control computer as a monitoring system. It transforms the complex analog control operation into a simple mouse click operation, reduces the huge analog controller stack to an industrial control computer, and changes the complex and huge number of control cables. For a serial phone line. It will become a fact in the remote video surveillance, and provide remote monitoring for the Internet. However, the digital control is not so perfect, the price of controlling the host computer is very expensive, the module is wasted, the system may have a crisis of collapse across the board, the control is lagging behind and other issues still exist.

Third, the processing layer processing layer may be referred to as the audio and video processing layer, it will have a transmission layer audio and video signals sent to the distribution, amplification, segmentation and other processing, the organic presentation layer and the control layer to be connected. Audio and video distributors, audio and video amplifiers, video splitters, audio and video switchers, and so on all fall into this category.

Fourth, the transmission layer The transmission layer is equivalent to the blood of the video surveillance system. In the small-scale video surveillance system, our most common transmission layer equipment is the video line, the audio line, for the long-range monitoring system, we often use the radio frequency line, the microwave, for the remote monitoring, we usually use the Internet. A cheap carrier. It is worth mentioning that the emerging transport layer media - network cable / fiber. Most people have a misunderstanding in digital security monitoring. They think that the digital control video surveillance system used by the control layer is a digital video surveillance system, but it is not. The transmission media of a pure digital video surveillance system must be a network cable or an optical fiber. When the signal comes out of the acquisition layer, it has already been modulated into a digital signal. The digital signal is already running on a mature network. Theoretically, there is no attenuation. This guarantees a lossless display of the remote monitoring image. This is unmatched by analog transmission. . Of course, high-performance returns also require high-cost investment, which is one of the most important reasons why pure digital video surveillance systems cannot be popularized.

5. Execution Layer The execution layer is the command object of our control instructions. At some point, it is not very well separated from the support layer and acquisition layer that we mentioned later. We believe that the controlled object is the execution layer device. For example: PTZ, lens, decoder, ball and so on.

Six, support layer As the name implies, the support layer is used for the back-end equipment support, protection and support acquisition layer, implementation layer equipment. It includes brackets, protective covers and other auxiliary equipment.

VII. Acquisition layer The acquisition layer is a key factor in the quality of the entire video surveillance system, and it is also the place where the system cost is the most expensive. It includes lenses, surveillance cameras, alarm sensors, and more.