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【正文】 technical development and divided into three stages: digital monitor multimedia stage, digital monitor DVR stage and digital monitor work stage. 1, video monitoring system simulations simulate video monitoring system is divided into microprocessorbased video switch control plus PC multimedia management and pcbased realize the switch control of matrix host and system multimedia management two types. Analog closedcircuit television monitoring system is actually the bination of many simulation monitoring equipment, system mainly consists of frontend device and terminal control device and signal transmission medium three parts, including: frontend 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, etc. As microprocessors, the function, performance of microputers and heighten, mult imedia technology application, the system in functionality, performance, reliability, structure pattern, etc, great changes have happened to the video monitoring system, more convenient, the position of the interface with other technical system tends to regulate, manmachine 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 work structure is mainly a ChanGongNeng, oneway, lumped way of information collection work, so system although has developed 唐 山 學 院 畢 業(yè) 設 計 23 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 regional 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 twistedpair dump more short, this determines the analog monitor only suitable for single building, small neighborhood and other 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 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 pression technology, work munication technology of digital video surveillance system development, the rapid 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 pression technology matures, the puter based 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, plementary with other transmitter simulation video monitor mode, its advantage mainly displays in: a, 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 puter work technology, digital multimedia remote work monito r from distance limit. C, due to the large capacity 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 surveillance video based on PC for: the structure of system patible/industrial PC + video capture card + ordinary/more reliable operation platform + application software. From the system position structure to analysis: 唐 山 學 院 畢 業(yè) 設 計 24 a, PC for 24 hour uninterrupted job, its performance is not very stable, gkong PC relative patible PC39。s stability have a class enhancement, suitable for plex 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 not very standardized, it39。ll 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 are stored in the disk, video processing must highdensity input of large quantities of data, and to work hard drive, the average for the hard disk logic (such as Windows, already can39。t adapt to FAT32) so susceptible, causing instability crashed phenomenon. C, application software: the simple application 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 co nnection, etc. The ability to deal with more work D, video capture 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 monly, 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 hardware conflicts, its stability will have a major influence. Embedded system is used as the center, software and hardware can be cut, to adapt application