On Application of Linux System in DVR Equipment

First, the development of video surveillance technology Video surveillance system has always been a hot spot in the field of monitoring, it is intuitive, convenient, rich in information content and widely used in various industries, such as: transportation, electricity, communications, oil, terminals, warehouses, finance , Government agencies, government agencies, service windows, 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 communications. In terms of its development stage, it has experienced the following stages.

1. The earliest application of video surveillance system based on analog transmission video surveillance system is to use analog signals in cable or fiber transmission, and then centralized monitoring and video. This video surveillance system based on analog images was born on the day of the birth of televisions and video cameras. Its video surveillance system is mainly composed of cameras, video switching matrix, monitors, video recorders, etc. It is connected through video lines and control lines and is mainly used in security and production management occasions. It is characterized by convenient construction and low price; however, this method has limited transmission distance, poor safety and a single monitoring method.

2. PC-based card video monitoring system based on Windows as an operating system platform There are currently many digital video recording monitoring systems on the market using PCs with Microsoft Windows as the operating platform (generally called PCbase Digital Video Surveillance System), mainly because Windows provides The familiar development environment can support a large number of peripheral devices and applications, so developers are easy to use, and even more progress in video capture and compression technology, making PC-based card video surveillance systems become the current In the mainstream, the popularity of PCs has also promoted the development of such technologies. This kind of video surveillance system is mainly composed of cameras, various types of acquisition equipment, PC/IPC, video acquisition compression card, communication interface card, PTZ camera control decoder, alarm box, etc. It depends on the communication network to constitute the entire video surveillance system. . It is characterized by strong functionality and high flexibility; however, the Windows operating system is not designed for the single application requirements of digital video surveillance systems, and its own version is expensive, the software is large and complex, and the additional functions of packaging are excessive, so the hardware resources The relatively high requirements make the system less stable and less reliable. 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 major problem.

3. PC board type DVR based on Linux as operating system platform

The hardware is composed of a PC as a structure, which has strong versatility and transparent accessory prices. With the embedded LINUX operating system and application software developed on this basis, there are no copyright issues. There is no need to buy expensive operating systems and you have abandoned the use of pirated software. The operating system is an embedded LINUX system, which can be loaded on a hard disk or solidified on a USB flash drive, a CF card, or an electronic hard disk. After the data is written, it is never lost. This facilitates the stability of the system itself and facilitates the upgrade. The system has good stability, versatility, and wide applicability, and is not affected by power outages, illegal operations, and viruses. Fool-style operation interface, suitable for all levels of use. Since most of the source code under the Linux system is also open and allows users to change it according to requirements, Linux users do not need to worry about the lack of necessary applications, and accelerate the speed of research and development, and the system itself. And most of the applications are free, but also can save a lot of R & D costs, the use of self-developed technology, the entire system does not have a back door, embedded network firewall, will not give hackers an opportunity, the security of the network With protection. System network transmission is powerful. Administrators can monitor the image remotely, play back video images, and download recording files for backup use.

Second, the shallow interpretation of the Linux operating system From Microsoft to control the operating system so far, most people think that the operating system is Windows95/98/2000/XP, and even many people do not understand what is the operating system, let alone use Linux. Recently, as many international computer industry leaders have expressed their support for Linux, Linux has suddenly become a hot spot in the computer industry, and many people have invested in Linux. Recently, we can see “Linux” reports on many information media. Linux is no longer an operating system known to senior computer professionals. More and more people are curious about Linux, and more and more users are willing to try this operation. system. Up to now, many large manufacturers, including IBM, have publicly announced that their products support Linux. Even the most popular IAs (information appliances) have announced that they will adopt Linux as the core of the system. The monitoring industry has also started to invest R&D funds in Linux. Operating platform monitoring products, Linux is currently the only one that can be formed against Microsoft's operating system.

The term Linux has been mentioned many times before. What is Linux? Simply put, Linux is a set of freely available and freely distributed Unix-like operating systems designed and implemented by thousands of programmers around the world. Its purpose is to establish a Unix-compatible product that can be freely used by the world without being subject to the copyright restrictions of any commercial software.

Linux features:

1. Linux provides a multi-user, multitask, full-fledged operating environment that can operate on many different computer devices (or single chips) with minimal hardware support.

2. Linux has a high-resolution and excellent graphical interface (GUI), which greatly enhances the application of digital surveillance systems.

3. Linux is completely free and can be freely downloaded, copied, and used on the Internet. At the same time, its code is completely open and can be freely developed and changed. This feature has enabled more than 10 million people worldwide to use Linux, but also because many companies have invested in the development of core programs, development of related software and hardware peripheral drivers, so that the growing functionality and integrity of Linux.

4. The open architecture and scalability design of Linux itself can be tailored to digital video surveillance applications, removing redundant functions that are not related to monitoring, and improving system performance while reducing the chance of problems.

5. Linux is designed from the beginning to the end for network applications. It supports many international standards such as TCP/IP and WWW, and can cater to all the needs of the new generation of DVR products such as Internet/communication network links.

Because the digital video surveillance system is a professional field, which involves a large number of I/O operations, video capture/storage, and video compression/decompression of CPU operations, it is able to meet 24 hours a day and 7 days a week. In addition to functional requirements, the choice of operating system platform is also very important for online service requirements and the cost of effectively reducing overall operations.

Third, the application of Linux in the DVR system DVR has become a global hot product, in the future network age, its importance is not to be underestimated, the user's demand increases, making the world's leading monitoring industry manufacturers more and more active in DVR products The research and development and improvement. The merchants in the surveillance industry have combined digital image recording technology, digital management technology, communication transmission technology, automated integrated interface technology, and control software technology to develop digital hard disk video remote monitoring products, together with easy-to-use humanized graphics. The interface (GUI) allows the average person to easily use the monitoring system.

The Linux operating system works with real-time video capture cards and video cameras to perform video compression, video recording, and storage. In addition to developing digital video surveillance systems that are easy to operate, simple in function, and affordable, they can effectively integrate Internet and telephone networks. , Security anti-theft devices, as a security device for autonomous security.

Different from other video applications, DVRs must store a large amount of security surveillance video data. Therefore, having a large storage space for data and data backup functions is an important condition for selecting an operating system.

In addition to supporting large-capacity hard disks for data storage, Linux can increase storage capacity through the addition of hard disks and disk mirrors with data mirror functions. In addition, its backup peripheral support is rich, and data can be effectively backed up on CD-RWs. And NAS network storage devices that combine network technology.

The Linux operating system has the required stability and complete network functions such as decentralized, unmanned operation, massive centralized management, configuration, monitoring, alarm processing, etc.; multiple Linuxbase digital hard disk video recording and monitoring systems can effectively be integrated through the network. , With the central monitoring system and remote digital video surveillance host solution, not only can meet this need, but also have the flexibility of future expansion. In the future of the Internet era, users need a remote monitoring system with powerful network functions to integrate security devices such as digital video surveillance, access control, and fire-fighting trusts, through the graphical control of a modular intelligent central monitoring system. The interface allows users to effectively perform remote multi-point live video surveillance and related device control anytime, anywhere through Internet browsers or other terminal devices; providing the required stability and performance through the Linux operating system This system will effectively assist companies, factories, and communities in establishing an internal control center and control branches scattered throughout the country.

Fourth, Linux DVR superior application prospects After several years of development, Linux technology and products are maturing, more and more companies understand the advantages of Linux, and use Linux as the main operating system and application platform, security monitoring applications are not exception. With its unique features, Linux has been deeply involved in the digital video surveillance market for a long time; it can be tailored to meet the needs of different hardware devices (PC or single chip) and digital video surveillance applications, not only avoiding the complexity of the standard system, and It can effectively reduce the demand for hardware resources; in order to effectively reduce the overall operating costs 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. Most embedded systems tend to adopt the Linux operating system. The related development tools, browsers, GUIs, and application software technologies are basically mature. The market that has already been adopted for Linux system applications includes industrial control, network equipment, set-top boxes, and network computers. . . And so on, digital hard disk video surveillance system is also one of the most commercially 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 produce results.