1、 1 外文 文献 Video surveillance system is safe guard system is an important part of a preventive ability strong comprehensive system. Video monitoring with its convenient, intuitive and information content rich and widely used in many occasions. In recent years, with the development of modern science an
2、d technology, in particular network bandwidth, computer processing power and storage capacity rapidly increase and various practical video information processing technology, video surveillance technology also appeared a considerable development, video monitoring entered the digital network age, incr
3、easingly attention by people and attention. The development of video surveillance system is mainly early analog closed-circuit television monitoring system combined to video monitoring system model of digital video monitor and now the evolution process, and the system of digital video monitor system
4、 now according to the technical development and divided into three stages: digital monitor multimedia stage, digital monitor DVR stage and digital monitor network stage. 1, video monitoring system simulations simulate video monitoring system is divided into microprocessor-based video switch control
5、plus PC multimedia management and pc-based realize the switch control of matrix host and system multimedia management two types. Analog closed-circuit television monitoring system is actually the combination of many simulation monitoring equipment, system mainly consists of front-end device and term
6、inal control device and signal transmission medium three parts, including: front-end equipment is mainly a camera, haeundae, decoder, control equipment is mainly a switching matrix, image segmentation device, monitor and control the keyboard, video, etc. Transmission medium including cable, control,
7、 etc. As microprocessors, the function, performance of microcomputers and heighten, multimedia technology application, the system in functionality, performance, reliability, structure pattern, etc, great changes have happened to the video monitoring system, more convenient, the composition of the in
8、terface with other technical system tends to regulate, man-machine interface more friendly. But because video monitor and control system in the flow of information form does not change, the video signal is still simulation system, the network structure is mainly a ChanGongNeng, one-way, lumped way o
9、f information collection network, so system although has developed 2 to a high level, has not much potential can dig, its limitations still exist, to meet the higher request, digital is the only way. Simulation monitoring system of main faults are: a, usually only suitable for small range of regiona
10、l monitor video signal transmission, simulation tools, and is mainly coaxial cable to transmit analog video signal coaxial cable, the distance is not more than the distance twisted-pair dump more short, this determines the analog monitor only suitable for single building, small neighborhood and othe
11、r small range of places. B, the system of expansion ability difference for has already built good system, if want to add new monitory point, often is one change makes all change, new equipment is also hard to add to the original system in. C, unable to form effective alarm linkage, because each part
12、 between independent operation, the control protocol is difficult to each other, linkage in the limited scope only. 2 video monitoring system, digital multimedia technology, video with compression technology, network communication technology of digital video surveillance system development, the rapi
13、d rise, on the market today there are two types of digital video monitor system type, one is the digital video equipment video monitoring system for the core, another kind is embedded video Web server video monitoring system for the core. Digital video compression technology matures, the computer ba
14、sed on PC universalization, create conditions multimedia monitor. This new video monitoring system of rapid rise, partially replaced with video matrix image segmentation device, video as the core, complementary with other transmitter simulation video monitor mode, its advantage mainly displays in: a
15、, PC multimedia monitor video matrix, the host integrated image segmentation device, many functions of video recorders, simplifies the structure of the system. B, because use the computer network technology, digital multimedia remote network monitor from distance limit. C, due to the large capacity
16、disk array inventory device or CD storage, can save you a lot of tape medium, and it is helpful to the multimedia information system. But as the PC video surveillance video system development, in actual engineering in use process, also exposed some shortage, mainly system work instability. The video
17、 surveillance video based on PC for: the structure of system compatible/industrial PC + video capture card + ordinary/more reliable operation platform + application software. From the system composition structure to analysis: 3 a, PC for 24 hour uninterrupted job, its performance is not very stable,
18、 g-kong PC relative compatible PCs stability have a class enhancement, suitable for complex working environment. B, operating system: with Windows 98 for operation platform system, the industry insiders know, there are certain Win98 stability problem, if at the same time the application software is
19、not very standardized, itll be easier in use process appears work instability, freezes and other issues, and PC video surveillance video system realization of their software in Windows 95/98 / NT, Unix, Linux operating system, such as general while system files, application software and image files
20、are stored in the disk, video processing must high-density input of large quantities of data, and to work hard drive, the average for the hard disk logic (such as Windows, already cant adapt to FAT32) so susceptible, causing instability crashed phenomenon. C, application software: the simple applica
21、tion software system is not can be used for security video monitoring system, fields of application software ability should support multitasking concurrent processing, such as monitoring, video, playback, backup, alarm, control, remote connection, etc. The ability to deal with more work D, video cap
22、ture card: video surveillance video system for road input system are usually video capture card, can use multiple CARDS way, also can use single card mode. Say commonly, a single card way better integration high stability will more than all the way, many using card has a card way very easy to form h
23、ardware conflicts, its stability will have a major influence. Embedded system is used as the center, software and hardware can be cut, to adapt application system function, reliability and cost, volume etc comprehensive demanding special computer system for monitoring system, i.e. the special comput
24、er system tailored. Embedded system mainly consists of embedded processor, relevant support hardware, embedded operating system and application software system etc, it is the collection software and hardware in the integration of can work independently devices. Embedded operating system is a kind of
25、 real-time, supports embedded system application operating system software, it is embedded system extremely important constituent, usually includes and hardware related software drivers, system kernel bottom, device driver interface, communication protocol, graphic interface, standardization browsers, embedded real-time operating system in the related hardware and efficiency of dependence, software application and specificity solid state has more prominent characteristics. The advantages and
