Introduction and Selection of Digital Video Surveillance Technology
Accompanied by the maturity and improvement of computer, Internet, audio and video codec, and streaming media technologies, video surveillance technology is moving towards digital, network, high-definition, and intelligent development driven by the huge demand in the security market. "Sihua" represents the higher direction and trend of video surveillance technology. The transformation of traditional video surveillance technology to "four modernizations" is also an inevitable process. Driven by the trend of “four modernizations,” new technologies and new products continue to emerge, providing users with more choices; at the same time, in terms of technical capabilities and maturity, some new technologies and new products have yet to be verified. For users, how to make a reasonable choice in the face of numerous video surveillance technologies? The following will be discussed.
Introduction and Selection of Digital Video Surveillance Technology
The development of security video surveillance systems for networked, high-definition to the highest level of goal intelligence must digitize analog signals. Networking is the networking of digital video surveillance systems, that is, digital video surveillance systems that use network transmission. After the system is networked, the number of front-end equipments varies from hundreds to thousands, and as many as tens of thousands or even hundreds of thousands, it is impossible to rely on human monitoring. It is necessary to give the computer to analyze and classify the image resources of the front-end equipment. Processing, identification, tracking, and pre-alarming are intelligence. Therefore, intelligence is the advanced stage of network development, and it is also an inevitable result of network development. Therefore, the security monitoring system must be networked, high-definition, and intelligent. Digitization is the foundation and core of the development of security video surveillance systems.
The significant advantages of video digitization include: Strong anti-interference ability, and greatly improve signal quality. Due to the digital form, it is easy to perform various digital processing, noise elimination can be achieved, the color brightness is also good separation, easy to eliminate the brightness flicker and ghosting, reduce the nonlinear effects, greatly improve the power / frequency utilization; digital signal is easy to implement storage, Copy and provide new features. Digital television signals are easily stored, and digital signals are not duplicated too many times to reduce quality. There are too many new features: special effects, multi-picture, fast search, zoom, random access, and editing.
In the face of analog signals and digital signals, how do users choose? Each has its own advantages and disadvantages. In the case of small and medium-sized enterprises, the غير مجاز مي باشدt of building a video surveillance system is not small. The monitoring system of the front-end equipment using analog technology has a lower غير مجاز مي باشدt and better real-time performance; the pure-digital monitoring system eliminates many wiring troubles. However, the price is relatively expensive, how to balance the relationship between the two? This needs to be determined according to the actual situation.
Introduction and Selection of Networked Video Surveillance Technology
With the advent of digitalization and IP technology, the networked development of video surveillance has a solid foundation. For example, due to the use of TCP/IP networks, network video surveillance can achieve remote monitoring and low-غير مجاز مي باشدt expansion of the monitoring range. These advantages of network video surveillance have greatly expanded its application scenarios. The use of network video surveillance in some large-scale monitoring projects indicates that this technology has begun to mature. Taking advantage of the Beijing Olympics and the Shanghai World Expo, online video surveillance has developed rapidly in recent years.
In fact, the market for network video surveillance is far more than only large-scale enterprises and public safety. In recent years, with the strengthening and popularization of security awareness, the field of security has gradually expanded, gradually shifting from public security and monitoring of large and medium-sized enterprises to small and medium-sized enterprises and households. Users' safety and control. With the increase in high-value and large-value properties such as real estate, automobiles, and home appliances, together with the advent of network cameras, surveillance objects have been further expanded, including real-time tracking and monitoring of property, facilities and people. More and more companies and families hope to use network monitoring systems to help them avoid losses, prevent accidents, control the scene at any time, and reduce unsafe and unfair factors. In addition, road traffic, corporate IT, education, and medical services all have great demands on online video surveillance. The market has a good prospect for development.
At present, the help of networked digital technology for video surveillance is more of an improvement to the transmission environment and capabilities. From a larger perspective, it is a new type of monitoring and management platform. However, if you want to count on the improvement of networked digital work capabilities, I am afraid that it is still difficult to use the current technology and the use of the environment. Although the current public network environment has been greatly improved, and the types of networks are becoming more abundant in development. However, it is still difficult to support the huge flow of information transmission in the existing public network environment. Therefore, opening a dedicated network transmission line is currently the main mode of maintaining remote network transmission. Of course, this undoubtedly increases the maintenance غير مجاز مي باشدt of the entire system. Users should still choose the technology according to actual needs.
The concept of "high definition" was originally proposed by the television industry. After decades of development, it has been well applied in the broadcast and television industry and has brought about considerable benefits. However, compared with the television industry, the concept of "HD" introduced by the security video surveillance industry is much later.
Professor Chen Long, a researcher at the Institute of Automation of the Chinese Academy of Sciences, mentioned at the 10th China International Building Intelligence Summit Security Industry Summit: “High-definition is the focus of attention in the field of video surveillance. In general, high-definition means that the physical resolution is Above 720P, there are two types of HD standards in the world, one is 720P or 1080P, which is progressive scanning, and the other is high-deinterlacing, such as 1080i. There is no relevant standard in China, domestic use The main ones are 720P and 1080P. To achieve true high-definition surveillance, we must start from the source to the transmission, to the compression, to the video, all aspects of one-stop, only one-stop high-definition can be true high-definition."
Although there are many high-definition surveillance products on the market, including analog high-definition (960i), digital high-definition (HD-SDI), and IP high-definition, due to the constraints of غير مجاز مي باشدt, technology, and other factors, high-definition for the video surveillance industry has not yet Wide range of applications to the actual. Due to the different application environments and purposes of use, all types of HD have a certain amount of room for development.
With the rapid development of video surveillance technology, the requirements of users for video surveillance products are also constantly improving, function requirements are more complete and stable, and performance requirements are more clear and accurate. At the same time, how do you look at a person's facial features at shopping malls, banks, etc.? How do you look at the licences of high-speed vehicles? How can you quickly and accurately find targets in crowded railway stations, stadiums, and plazas? ...? All these issues require high-definition video surveillance products to solve.
Introduction and Selection of Intelligent Video Surveillance Technology
The advent of intelligent video surveillance technology turns video surveillance from the past "passive surveillance" into "active surveillance," which frees video surveillance personnel from tedious operations and massive information and helps them manage surveillance more efficiently and accurately. aims. And intelligence is the highest level of "four modernizations."
But so far, intelligent video surveillance technology has only been applied in banking, transportation, industrial, retail, and other industrial markets, and its scale is relatively small. It can be said that the market for intelligent video surveillance has not really expanded. There are many reasons for this, including technologies, standards, and practicality. It cannot be denied that there are many difficulties in the application of current intelligent video technology. Due to limited understanding and unreal propaganda from manufacturers, many users overestimated the role of smart analytics. They even regarded smart video analytics as human brain thinking, and put forward some requirements that are much higher than the current state of the art. At the same time, many manufacturers also overestimated the professional capabilities and patience of users in the civil field. These have greatly increased the difficulty of product promotion.
Speaking of intelligent video surveillance technology, I have to talk about the "Nanjing 1.6 shootings." Two days after the incident, the police released video footage of two robbery cases. It is understood that the acquisition of these two videos is not easy. The result is that more than 500 civilian police have screened tens of thousands of hours of video images on a 24-hour basis. The workload is large, and the manpower required is not discussed first. Medium time is the key, and trying to find clues one minute quicker may be very important for the rapid detection of cases. From these perspectives, efficient intelligent video analysis and retrieval software is undoubtedly necessary and urgently needed for modern crime detection work.
Although the market application status of intelligent video surveillance technology is not very optimistic at present, but with the development of the economy and the increasing demand for video surveillance, intelligent video due to its unique advantages will no doubt become a video surveillance system in the coming days. The upstart in the market.
Conclusion
No matter what kind of technology, it will have its advantages and disadvantages. For the new technology, it still needs to pass the test of time. Correctly understanding the adaptability and limits of video surveillance technology and selecting the right technology based on its actual needs is the most important.
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