The progress and development of society has promoted the continuous growth of people's demand for the security industry. At the end of the last century, the large-scale transfer of international electronic product manufacturing to the domestic market has brought new business concepts and new product technologies to the Chinese security surveillance market. In the past, the monitoring industry, which has always relied on imported products, has begun a full localization process. The rapid development of the digital surveillance market and the rapid growth of the market capacity have also caused companies that were originally engaged in the IT industry and the home appliance industry to get involved, disrupting the semi-closed state of the original surveillance industry and accelerating the competition and differentiation of the surveillance market. This article focuses on the development process of digital surveillance and its advantages.
The development process of digital monitoring products in China
Recalling the digital development process of China's domestic monitoring system, the period is divided into the following stages:
The first stage is the early 1990s: the monitoring system at that time generally used foreign imported matrix control hosts. In order to meet the demand of the popularization of computers at that time, monitoring companies have developed software that uses computers to control the matrix hosts to realize computer monitoring. Multimedia control such as system image switching, audio switching, alarm processing, and image capture. At this time, the computer multimedia monitoring is actually only used as an auxiliary control keyboard of the monitoring system, which can be said to be the prototype of the beginning of digital monitoring in China.
The localization process of China's monitoring products also started during this period. Many monitoring companies began to produce or imitate the matrix host, decoder, multimedia control system, PTZ peripherals and other monitoring products compatible with foreign companies. It is characterized by small-scale industrialization based on traditional electronics manufacturing.
The second stage is the middle and late 1990s: this period is a period of rapid development of image processing technology, computer technology and network technology. After completing the industrial production of external equipment such as matrix host, decoder, multimedia control system, and PTZ, domestic companies in China found that Taiwan and foreign monitoring companies began to transfer their monitoring production lines based on traditional electronics manufacturing to China for production. Products include cameras, monitors, image processors, video tape recorders, alarm detectors, alarm hosts and other monitoring products. The above development process is only a common phenomenon in the 1990s when foreign electronic product manufacturers entered the Chinese market on a large scale. Most monitor the localization process of products. Domestic companies in China can buy Panasonic cameras made in China, video recorders from Sanyo, and alarm detectors from Dexin at a lower price, which has promoted the widespread application of surveillance systems in China.
At this stage, the digital monitoring process has started abroad. The first digital monitoring products introduced in China are the telephone line transmission and network transmission products produced in the United States and Israel. The image compression standard uses MJPEG. The system has simple digital monitoring and network monitoring. There are many functions, and there is a function that makes the whole surveillance industry feel new. Digital video recording function. Since digital monitoring equipment has just been introduced into the monitoring industry, its extremely high-tech added value immediately attracted many monitoring companies to invest in it, and they have developed digital monitoring hosts based on computer structures. The system uses a matrix switcher, image splitter, and hard disk recorder. Integrated on a computer platform, a monitoring host product with Chinese characteristics has been formed and developed into an industry trend.
The third stage is after 2000: With the advancement of image compression technology, especially the popularization and application of MPEG-I and MPEG-II image compression chips, digital surveillance products have entered a period of rapid development since 2000. From the original digital surveillance video host to network cameras, network transmission equipment, telephone transmission equipment, professional digital hard disk recorders and other products.
After 2000, with the increasing demand for digitalization and networking of China's domestic surveillance systems, digital hard disk video recording devices began to replace traditional analog video recording devices. The increasing market share of digital surveillance products has made many traditional IT companies, network companies, and home appliances Enterprises are optimistic about this market, investing capital, manpower, and developing digital surveillance products, and the digital surveillance market is showing unprecedented prosperity.
Digital monitoring technology moves towards full digitization
The current digital monitoring technology mainly has two modes: a mixture of analog and digital (also known as a semi-digital monitoring system) and a fully digital security system.
1. The advantages of the hybrid digital monitoring system are highlighted
A digital monitoring system that mixes analog and digital is a monitoring system that uses front-end analog camera codec back-end digital processing technology, that is, the front-end camera remains a traditional analog camera, and the analog video signal is converted to a digital signal for transmission by the encoder Video surveillance system.
The advantages of the hybrid digital surveillance system are mainly reflected in the moderate investment, the front-end analog camera is easy to maintain and replace, and the front-end camera is not limited by the 90-meter network link. To sum up the previous experience, especially in the digital monitoring technology with many outdoor monitoring probes, it is recommended to use a combination of analog and digital monitoring technology. When considering the outdoor use of IP cameras, it is limited by the network cable transmission link of the IP network camera. The switch is installed outdoors, but affected by natural conditions such as outdoor environment, temperature and humidity changes, it is necessary to configure an outdoor cabinet for the switch, which is extremely inconvenient for management and maintenance. Using analog-to-digital monitoring technology, since the transmission distance and technology of analog video signals are much more convenient than network transmission, core equipment such as encoders and switches can be placed indoors in a better environment to improve the overall stability of the system.
2. Full digital monitoring is the development trend
Compared with the traditional monitoring system, the technical advantages of digital high-definition monitoring are obvious. The fully digital security system uses modern digital technology, including modern sensing technology, digital information processing technology, digital communication technology, computer technology, multimedia technology and network technology. The speed of information transmission improves the functions of security information collection, dissemination, processing, and display, realizes the full sharing of security information and resources, improves the degree of system optimization, and enhances security. The author believes that full digital monitoring is the future development trend of monitoring systems.
The use of high-definition cameras can also optimize the configuration of monitoring points. Under the same conditions of the coverage area of ​​the monitoring range, one megapixel network camera can replace the original 2 or 3 standard definition cameras, or even more. After adopting the network high-definition transmission mode, all data can be transmitted through the network, including video, audio, alarm signals, and even network cameras that support POE power supply. The power supply can be provided by the network, which greatly simplifies the installation of cables during installation Workload and complexity.
In addition, high-definition surveillance can provide more content and more high-definition detailed pictures, thereby creating conditions for the application of intelligent surveillance (video analysis, linkage). In financial, office, hotel and other projects, digital monitoring wiring can be considered together with structured wiring, and there are great construction advantages in terms of construction wiring and reducing bridges and pipelines in public areas.
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