Analysis of the application of Linux system in DVR equipment

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I. Development of Video Surveillance Technology

Video Surveillance System has always been a hot spot in the surveillance field. It is available in various industries with intuitive, convenient and rich information content. Widely used, such as: transportation, electricity, communications, oil, terminals, warehouses, finance, government agencies and institutions, and military, public security, prisons, water conservancy /water plants, civil aviation and other key departments. The development of video surveillance systems is closely related to the development of electronics and communication. As for the stage of its development, it has mainly experienced the following stages.

1. Video surveillance system based on analog transmission

The earliest application scheme of video surveillance system is to transmit analog signals in cable or fiber, and then centrally monitor and record. This kind of analog image-based video surveillance system was born on the day when the TV and camera were born. The video surveillance system is mainly composed of a camera, a video switching matrix, a monitor, a video recorder, etc., and is connected through a video line and a control line, and is mainly used for security and production management occasions. Its characteristics are convenient construction and low price; however, this method has limited transmission distance, poor security and single monitoring mode.

2. PC-based video surveillance system based on Windows as the operating system platform

There are many digital hard disk video surveillance systems on the market using PC with Microsoft Windows as the operating platform (generally Called PCbase digital video surveillance system, mainly because Windows provides a familiar development environment, can support a large number of peripheral devices and applications, so developers can easily get started, and even more progress in video capture compression technology, The PC-based board-type video surveillance system has become the mainstream, and the popularity of PCs has also promoted the development of such technologies. This kind of video surveillance system mainly consists of cameras, various acquisition devices, PC/IPC, video capture compression card, communication interface card, PTZ lens control decoder, alarm box, etc., depending on the communication network to form the entire video surveillance system. . It is characterized by strong functions and high flexibility; however, the Windows operating system is not designed for the single application requirements of the digital video surveillance system, and its own version is expensive, the software is huge and complicated, and the additional functions are too much, so the hardware resources The requirements are relatively high, and the stability and reliability of the system are relatively reduced. More and more monitoring systems need to do network remote monitoring and management. Due to the popularity of the Windows operating system, network security is also a big problem.

3. PC-based DVR based on Linux as an operating system platform

The hardware consists of a PC as a structure, with strong versatility and transparent price of accessories. The embedded LINUX operating system and the application software developed on this basis have no copyright problems. No need to buy expensive operating systems, but also abandoned the use of pirated software. The operating system is an embedded LINUX system, which can be loaded on the hard disk, or can be solidified on the USB flash drive, CF card, and electronic hard disk. After the data is written, it will never be lost, which is convenient for the stability of the system itself and convenient for upgrading. The system has good stability, versatility and wide applicability, and is not affected by power outages, illegal operations, viruses, etc. The fool-like operation interface is suitable for people of all levels. Since most of the source code (Linux) in the Linux system is also publicized and allows users to change according to requirements, Linux users do not have to worry about the lack of required applications, speeding up the development process, and the system itself. And most of the applications are free, and can save a lot of research and development costs, using self-developed technology, the entire system has no back door, embedded network firewall, will not give hackers a chance, network security With protection. The system network transmission is powerful, and the administrator can monitor the image in real time through the browser on other systems, play back the recorded image screen, and download the record file for backup use.

Page 2: A brief explanation of the Linux operating system

Second, the Linux operating system

Since Microsoft is in charge of the operating system, most people think that the operating system is Windows 95/98/2000/XP, even many people don't know what an operating system is, let alone use Linux. Recently, many international computer industry leaders have expressed their support for Linux, making Linux a hot spot in the computer industry. Many people have invested in Linux. Recently, in many information media, we can see that Linux has no longer been an operating system known to senior computer personnel. More and more people are curious about Linux. More and more users are willing to try this. operating system. Up to now, many large manufacturers including IBM have publicly announced that their products support Linux. Even the most popular IA (information appliances) have announced that they will adopt Linux as the core of the system. The monitoring industry has also begun to invest in research and development funds with Linux. The monitoring products of the operating platform, Linux is currently the only operating system that can compete against Microsoft.

The term "Linux" has been mentioned many times before. What is Linux? Simply put, Linux is a free-to-use and freely distributed Unix-like operating system designed and implemented by thousands of programmers around the world. The goal is to create Unix-compatible products that are freely available worldwide and that are not subject to the copyright of any commercial software.

Features of Linux:

1.Linux provides a complete operating environment for multi-user and multitask, with very little hardware support. Operates on a variety of different computer devices (or single-chip).

2.Linux has high resolution and excellent graphical interface (GUI), which greatly enhances the affinity of digital surveillance system applications.

3.Linux is completely free and can be downloaded, copied and used on the Internet. Its code is also completely open and can be developed and changed at will. This feature has enabled more than 10 million people worldwide to use Linux, and because many vendors are investing in core programs, developing software and hardware peripheral drivers, Linux's functionality and integrity are growing.

4.Linux's open architecture and Scalable design can be tailored for digital video surveillance applications, eliminating redundant features that are not related to monitoring, while reducing system performance and reducing The probability of a problem.

5.Linux is designed for network applications from beginning to end. It can support TCP/IP, WWW and other international standards, and can meet all the needs of the new generation DVR product Internet/communication network connection.

Since the digital video surveillance system is a relatively professional field, it involves video capture/storage of a large number of I/O jobs and video compression/decompression of CPU operations, so it can meet 24 hours a day. The 7-day online service demand and the effective reduction of the overall operation cost, in addition to functional considerations, the choice of operating system platform is also very important.

Page 3: Linux application in DVR system

Third, Linux application in DVR system

DVR has become a global hot product, in the future network era, Its importance is not to be underestimated, and the demand of users has increased, making the world's leading monitoring industry manufacturers increasingly active in the development and improvement of DVR products. The monitoring industry is a combination of image processing technology, digital management technology, communication transmission technology, automated integrated interface technology and control software technology to develop digital hard disk video remote monitoring products, plus easy-to-use humanized graphics. The interface (GUI) makes it easy for the average person to use the monitoring system.

The Linux operating system is equipped with real-time video capture card and camera for video compression, recording and storage. In addition to developing a digital video surveillance system with simple operation, simple functions and popular price, it can also be effectively integrated. Internet, telephone network, security anti-theft devices, as a security monitoring device for autonomy.

Unlike other video applications, DVRs must store a large amount of security surveillance video data. Therefore, it has high storage capacity and data backup function, which is an important condition for selecting an operating system.

In addition to supporting large-capacity hard disks for data storage, Linux can increase the storage capacity by installing hard disks and disk arrays with data mirror image functions. In addition, its backup peripherals are rich in support and can be used for data storage. Effective backup of CD-RW and NAS network storage devices combined with network technology.

The Linux operating system has the stability and complete network functions required for decentralized, unmanned operation, centralized management, setting, monitoring, and alarm processing; multiple Linuxbase digital hard disk video surveillance systems can be used. Effectively combined through the network, with the central monitoring system and the remote digital hard disk video recording host solution, not only can meet this demand, but also has the flexibility of future expansion. In the future Internet age, users need a remote monitoring system with powerful network functions, integrating digital video surveillance, access control, firefighting and other security devices, and graphical control of a modular intelligent central monitoring system. The interface allows users to effectively control remote multi-point instant image monitoring and related devices anytime and anywhere through an Internet browser or other terminal devices; providing the required stability and performance through the Linux operating system This system will effectively assist enterprises, factories and communities to establish internal control centers and control branches scattered throughout the country.

IV. Advantages of Linux DVR Application

After several years of development, Linux technology and products are becoming more mature. More and more companies understand the advantages of Linux, and Linux is the main choice. The operating system and application platform, security monitoring applications are no exception. With its unique features, Linux has been in the digital video surveillance market for a long time; it can be tailored to different hardware devices (PC or single-chip) and digital video surveillance applications, not only eliminating the complexity of the system, and It can effectively reduce the demand for hardware resources; in order to effectively reduce the overall operating cost of digital video surveillance and security management systems, the Linux operating system should be the most appropriate choice.

The stability, security and reliability of the Linux operating system have been recognized by the industry. At present, most embedded systems tend to adopt Linux operating systems, and related development tools, browsers, GUIs, and application software technologies are basically The market has been quite mature, commercial Linux system applications have been cut into the market including industrial control, network equipment, set-top boxes, network computers, etc. Digital hard disk video surveillance system is also one of the most promising Linux applications. It can be seen that Linux has gone through the bubble concept period in the IT industry and entered the practical market. It is preparing to bear fruit.