【正文】 ort multitasking concurrent processing, such as monitoring, video, playback, backup, alarm, control, remote connection, 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 system function, reliability and cost, volume etc prehensive demanding special puter system for monitoring system, . the special puter 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 realtime, 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, munication protocol, graphic interface, standardization browsers, embedded realtime operating system in the related hardware and efficiency of dependence, software application and specificity solid state has more prominent characteristics. The advantages and disadvantages of embedded system, the system for a special system, so the system is small, instruction downsizing and processing speed. B, system data in ROM/FLASH with fast speed, call, not be altered, good stability. C, system treatment of good realtime performance, stable performance. D, document management system is more suitable for large amounts of video data. E, in network function, audio and video sync issues may also difficult satisfactory. Embedded video Web server mode, a builtin video server embedded Web server, the embedded realtime multitasking operating system. The video signal digital camera sent by high pression chip after through internal bus to press, builtin Web server, Internet users can use directly on the Web server browsers on camera images, subscribers can also control the camera lens, haeundae, the actions or operate on system configuration. Because the video pression and Web function centralism to a small size within the equipment can be directly connected lans, achieve namely that look, omited inserted range of plex cable, convenient installation (only set an IP address), the user does not need to install any hardware device, with the browser can only watch. Embedded video Web server monitoring system and other surveillance system has the following characteristics: a parison of embedded video area is vast, have been supervised Web server monitoring system of Web server directly connected network, no cable length and attenuation, and the limit of the concept of network is no distance, pletely abandoned regional concept, expand have been supervised areas. B, the system has almost unlimited seamless expansion ability all equipment is mark, with IP address increased equipment just means that IP address the expansion. C, can form a very plicated monitoring network based on embedded Web server is the core of the monitoring system in network mode, with traditional analog monitor and based on PC platforms screening method has greatly different, because Web server output has pleted analog to digital conversion and pression, adopt uniform agreement on the network transmission, support across the router across the gateway, remote video transmission. D, stable and reliable performance, without staff management embedded Web server based on embedded puter technology, actually using embedded realtime multitasking operating system, and video pression and Web function due to focus on a small size, within the device directly concatenation LAN or wan, namely that look, system insert realtime, stability, reliability greatly improved, also need not specially assigned management, which is very suitable for unattended conditions. E, when the monitoring center needs to watch a video camera image, more network bandwidth will have certain requirements. The development of video monitoring system 1, video monitoring system development direction Video digitizing, front integration, network, system integration is monitoring the development of video monitoring system, and recognized the direction is the premise of digital network, network and system integration of video monitor based, so, the biggest two characteristics is the digital and network. 2, digital Digital is the 21st century features, is the information technology as the core, the necessity of the development of electronic technology, digital is toward growth pass, along with the time development, our environment will bee more and more digital. Video surveillance system is the system of digital first should flow in video, audio, (including from analog state control, etc.) state, which to digital pletely break classic cable TV system based on camera imaging technology as the center structure, fundamentally changing video monitoring system from information acquisition, data processing, transmission and system control of the mode and structural form. The flow of information digitization, coding pression, open video monitoring system, make agreements with the security system in other between each subsystem realize seamless connection, and the unified operation platform to realize the management and control system integration, this also is the meaning. 3 and network Video monitoring system of the structure of the network will mean system by lumped type to distribution type system transition. Distribution type system USES the multilayer hierarchical structure form and the realtime kernel techno