Analysis of the three major processes of digital surveillance

The progress and development of society have promoted the continuous growth of people’s demand for the security industry. The large-scale transfer of the international electronic product manufacturing industry to the domestic market at the end of the last century has brought new business concepts and new product technologies to the Chinese security surveillance market. The monitoring industry that has always relied on imported products in the past has begun the process of full localization. The rapid development of the digital surveillance market and the rapid growth of market capacity have also enabled companies in the IT industry and home appliance industry to step into it, 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 breakdown.

The development process of digital surveillance products in China

Reviewing the digital development process of China's domestic surveillance system, the period is divided into the following stages:

The early stage is the early 1990s: the monitoring system at that time generally used imported matrix control hosts from abroad. In order to meet the needs of computer popularization at that time, monitoring companies have developed software that uses computers to control the matrix hosts to achieve computer monitoring. System image switching, audio switching, alarm processing, image capture and other multimedia controls. The computer multimedia monitoring at this time is actually only used as an auxiliary control keyboard of the monitoring system, which can be said to be the embryonic form of China's digital monitoring.

The localization of surveillance products in China also started during this period. Many surveillance companies began to produce or imitate surveillance products such as matrix hosts, decoders, multimedia control systems, and pan/tilt peripherals compatible with foreign companies. Its characteristic is 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 mainframes, decoders, multimedia control systems, pan-tilts, etc., domestic companies in China found that Taiwanese and foreign surveillance companies began to transfer their surveillance 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 surveillance products. The above-mentioned development process is only a common phenomenon of foreign electronic product manufacturers entering the Chinese market on a large scale in the 1990s. Most monitor the localization process of products. Chinese domestic companies can purchase Chinese-made Panasonic cameras, Sanyo video recorders, and Dixin alarm detectors at lower prices, which has promoted the popularization and application of surveillance systems in China.

At this stage, foreign countries have begun the process of digital surveillance. The first digital surveillance products to be introduced into the country are telephone line transmission and network transmission products produced in the United States and Israel. The image compression standard uses MJPEG, and the system has many simple digital surveillance and network surveillance. There is also a digital video recording function that makes the entire surveillance industry feel novel. Since digital surveillance equipment has just been introduced into the surveillance industry, its extremely high high-tech added value immediately attracted many surveillance companies to invest in it, and they have developed digital surveillance hosts based on computer structures. This system combines matrix switchers, image splitters, and hard disk video recorders. 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 mass promotion 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 a variety of products such as network cameras, network transmission equipment, telephone transmission equipment, and professional digital hard disk video recorders.

After 2000, with the increasing demand for digitization and networking of domestic surveillance systems in China, digital hard disk video recording equipment began to replace traditional analog video recording equipment. The continuous growth of the market share of digital surveillance products has made many traditional IT companies, network companies, and home appliances Companies are optimistic about the market, investing capital, manpower, and developing digital surveillance products. The digital surveillance market is showing unprecedented prosperity.

Digital surveillance technology moves towards full digitalization

The current digital monitoring technology mainly includes 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 hybrid digital monitoring system are prominent

A digital surveillance system that mixes analog and digitization is a surveillance system that uses front-end analog camera codec and back-end digital processing technology, that is, the front-end camera remains as a traditional analog camera, and the analog video signal is converted into a digital signal through the encoder for transmission Video surveillance system.

The advantages of the hybrid digital surveillance system are mainly reflected in the moderate investment, the front-end analog cameras are easy to maintain and replace, and the front-end cameras are not restricted by the 90-meter network link. Summarize the past experience, especially in the digital monitoring technology of the cell with many outdoor monitoring probes, it is recommended to use the analog and digital monitoring technology. The main consideration is that when the IP camera is used outdoors, it is limited by the network cable transmission link of the IP network camera. The switch is installed outdoors, but due to the outdoor environment, temperature and humidity changes and other natural conditions, it is necessary to configure an outdoor cabinet for the switch, which is extremely inconvenient for management and maintenance. With analog-to-digital monitoring technology, since the analog video signal transmission distance and technology is far more convenient than network transmission, core equipment such as encoders and switches can be placed in a better environment indoors, improving the overall stability of the system.

2. Full digital monitoring is the development trend

Compared with traditional surveillance systems, digital high-definition surveillance has obvious technical advantages. The all-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 to accelerate 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 optimization of the system, and enhances security. The author believes that all-digital surveillance is the development trend of future surveillance systems.

The use of high-definition cameras can also optimize the configuration of monitoring points. Under the same conditions of the monitoring range and coverage area, one megapixel network camera can replace the original 2 or 3 standard-definition cameras, or even more. After adopting the network high-definition transmission method, all data can be transmitted by the network, including video, audio, alarm signals, and even network cameras that support the POE power supply function. The power supply can be provided by the network, which greatly simplifies the installation of cables. 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, the wiring of digital surveillance can be considered together with structured wiring. There are great construction advantages in terms of construction wiring and reducing bridge pipelines in public areas.