Talking about home network video surveillance technology and its foreground application

With the improvement of people's living standards and the popularity of the Internet, security protection has become more and more popular. In particular, the development of information technology and the improvement of people's living environment in recent years have prompted people's awareness of home security to be strengthened. Home network video surveillance, with its technically seamless compatibility with IP networks and the provision of remote real-time video processing capabilities and other network applications, has quickly become the fastest growing product in the market with a 40% annual growth rate. Its market demand is limitless. In fact, home network video surveillance is an inevitable outcome of social development, and it is an individual's security requirement for the social unit cell-family. So, what is the working principle of home video surveillance? Below, I will briefly talk about some technical issues in home video surveillance:

technical problem

Commonly used home monitoring systems typically include a set of cameras, monitors, and a central storage unit (DVR) that multiplexes video inputs prior to storage. PCs with embedded DVRs can drive basic analysis functions as well as monitoring and storage. The analysis and alarm functions of the basic home monitoring system are usually limited to simple motion detection and time or date stamping. The HMI (Human Machine Interface) is limited to DVR devices. When connected to a PC, the control and monitoring functions are greatly improved.

More advanced surveillance systems add audio monitoring, more video input, remote control and monitoring of Internet links, CD burning, and comprehensive alarm and call features. High-end systems also include servers (stream multiplexing), with independent additional storage units instead of DVRs. High-end systems also offer advanced motion detection capabilities, including smart zones and boundaries. For example, in the observation range of a camera, there are many people on the sidewalk that do not cause an alarm, and a large number of people in the area between the family and the sidewalk triggers a mobile alarm. Advanced analytics also include someone strolling and even parceling fall detection. The system is able to identify objects that move little or no. In very high-end home systems, the camera can perform analysis functions and perform real-time detection and alarms.

DVR is developed on the basis of digital video surveillance system. DVR adopts digital audio/video compression/decompression encoding and decoding technology, and uses hard disk to locally store compressed and encoded digital audio/video data stream and remotely transmit it over the network. The compression-encoded digital audio/video data stream and control information integrate functions such as image screen segmentation, multi-channel video switching, and recording/playback. Sensors, alarms, pan/tilt and lens controllers can also be connected to the hardware to achieve search range and target locking, as well as environmental monitoring and alarm output. Software can also add auxiliary functions such as image motion detection and feature extraction. To meet the needs of certain specific applications.

DVR can be divided into PC-based DVR and embedded DVR according to the structure of the product. These two DVR products have their own advantages and disadvantages. After years of development and application, PC-based DVRs have become more sophisticated and mature, and can take full advantage of the rich software and hardware resources on PCs. However, the Windows operating system used by the PC is a non-real-time operating system, and is vulnerable to virus attacks, which affects the reliability and stability of the system, and its expensive cost makes it difficult to popularize it for home use. Embedded DVR, without the support of PC's powerful software/hardware resources, the flexibility and functional richness of its products are limited to a certain extent, but with the continuous development of chip technology in recent years, the functions of embedded DVRs are increasingly The richness and maturity of products, combined with the inherent stability and low cost of embedded DVRs, are becoming more and more accepted, especially in popular home applications.

The PC-based DVR operating system is generally a Windows operating system, which has the characteristics of universal application, simple use, convenient maintenance in the future, and easy upgrade of software. However, the Windows operating system itself is unstable. However, in addition to running the DVR application software and running other software, the system will be unstable, and even serious problems such as "dead" will affect the normal operation of the system.

The Linux operating system supports multi-user, multi-tasking, and multi-channel processing. It is a network environment-based operating system with complete network functions. Users can connect to the Internet in a single machine under Linux, or set up a local area network (LAN). ); Linux can also be used to set up various servers to provide various services such as mail, FTP and Web on the Internet and intranet, which facilitates the networking of DVRs.

However, for ordinary home users, people still prefer Windows systems. After all, not everyone is familiar with the use of Linux systems.

solution

Introduce several home monitoring solutions with more applications:

1, network camera

You only need to buy a network camera (usually need to add a router), connect the network camera to the router through the network cable, you can achieve LAN monitoring. In most cases, remote port monitoring can be achieved by doing port mapping on the router. At present, some manufacturers have implemented route penetration technology, which does not require user router settings, and truly realizes plug-and-play, which is a good thing for users who are not familiar with computers.

The network camera can be remotely monitored via the Internet without the need for a computer at the monitoring front end. It can be viewed not only through the client software, but also directly through IE. In addition, most network cameras also support motion detection, video recording, history playback, and snap capture.

Since the monitoring front end only needs one embedded device, the cost is reduced, the installation complexity is reduced, and the maintenance is simple. Installation, many sites now have a network, can be directly used, if you use video cable, often re-wiring, high cost.

2, camera + video capture card + computer + monitoring software

Now all types of capture cards basically have their own monitoring software, generally can achieve remote monitoring function, users need to buy cameras, video capture cards (usually free distribution software), insert the capture card on their own computer, and then the camera Connect to the capture card, run monitoring software to achieve LAN and remote monitoring.

Such programs are relatively mature and use a lot of industry monitoring. For families that have already been renovated, it is not desirable to re-wire the video cable. In addition, since the home computer must be turned on 24 hours, it does not provide a good operating environment. From the cost of use, from the stability is not satisfactory. So although such technologies appear earlier and more mature, they have not yet become popular for home users. More importantly, because the monitoring cost is too high, it cannot be accepted by most families.

3, video server + analog camera

The video server uses a similar situation to the network camera, and the cost is slightly higher. It is more troublesome to install than the network camera, and the camera can be configured according to the user's needs. With the improvement of network camera and video server technology, the network environment will be improved, and the video surveillance threshold will be reduced. For home users, chain stores, and schools where the monitoring requirements are not high, the use of such devices will meet the needs of most users.

Application prospects

The market for network video surveillance is currently very broad. According to a 2005 report by Frost & Sullivan on the global video surveillance equipment market, sales of network cameras and video servers will increase from around $100 million in 2002 to $400 million in 2005 and $850 million in 2008. And it is expected to reach more than $1.2 billion in 2010. As part of video surveillance, home video surveillance is also growing and is being promoted as people pay more attention to their own security.

1, video surveillance digital

Video surveillance development has experienced three stages: analog video surveillance, semi-digital surveillance, and digital surveillance. For video surveillance, digital storage brings a revolutionary change. Digitization is the characteristics of the 21st century. The digitalization of video surveillance is an inevitable trend of surveillance technology.

2, video monitoring intelligent

Intelligentization is a relatively advanced level of video surveillance technology development. Because the amount of data monitored by video is very large, and the information that users really need is only a small part, or what really needs to be monitored is only some events with little probability of occurrence, how to obtain valuable information through massive data or how to visually Interpretation becomes a new direction for the development of video surveillance technology. Because it is more important for users to turn video surveillance from static, after-the-fact forensics into dynamic, real-time prevention and alerting. In fact, the existing monitoring systems are equipped with some low-level intelligent functions such as automatic displacement detection, day and night adaptive switching storage, and early warning settings (such as suspicious photos, fingerprints, etc.). With the development of technology, the all-intelligent monitoring system will require the ability to identify and make correct judgments before the incident, and provide people with the most effective and timely rapid response measures.

3, video surveillance IP

Video networks and IPTV are important applications for rapid network development. With the development of Internet technology, IP-based video surveillance is more acceptable. Network cameras use compressed video information to transmit multiplexed video over the Internet through TCP/IP protocol. The user can access the Internet at any time to realize the functions of command, scheduling, storage, and authorization control of the entire monitoring system. IP-based video surveillance will become mainstream in view of the impact of IPv6 on quality of service, network performance, and security improvements to improve the impact of Tier 1 IPv6 on next-generation Internet networks.

4, video surveillance wireless

Wireless includes two aspects: First, the movement of the monitoring center. Usually, the monitored object or the camera is often fixed. As the user of the monitoring system (monitoring center), it can be dynamic. When the company leader is on a business trip, when you need to know the company's production situation, you can use the notebook to access the IP address of the camera anytime, anywhere. The second is the wirelessization of video surveillance networks. With the development of wireless broadband networks, 3G-based wireless video applications have received much attention. When the monitoring points are scattered and far away from the monitoring center, or the monitored objects are not fixed (such as taxis, cash trucks, etc.), video surveillance objects using traditional wired networks are often costly and difficult to implement, and based on multiple wireless The mobile video surveillance of the transmission means achieves an irreplaceable advantage.

With the development of computer, codec and network transmission technology, video surveillance technology has experienced three stages of rapid development, and is now developing towards digital, intelligent, IP and network. At the same time, video surveillance combined with other technologies has produced many new applications, which help meet the needs of different home video surveillance users.

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