DVR(数字硬盘录像机)是近几年继模拟录像系统之后迅速发展的第二代监控系统。采用微机和Windows平台，在计算机中安装视频压缩卡和相应的DVR软件，不同型号视频卡可连接1/2/4路视频，支持实时视频和音频，是第一代模拟监控系统升级实现数字化的可选方案。
DVR(数字硬盘录像机)
DVR(数字硬盘录像机)是近几年继模拟录像系统之后迅速发展的第二代监控系统。采用微机和Windows平台，在计算机中安装视频压缩卡和相应的DVR软件，不同型号视频卡可连接1/2/4路视频，支持实时视频和音频，是第一代模拟监控系统升级实现数字化的可选方案。
DVR系统的特点：视频、音频信号的采集、存储主要为数字形式，质量较高;系统功能较为强大、完善;与信息系统可以交换数据;应用的灵活性较好。但是，由于其本身技术架构的局限性，数字硬盘录像机始终无法解决网络远程监控环境中的长延时、无法多路同时监控、高集成度集中监控等问题。
原因在于，DVR系统从监控点到监控中心为模拟方式传输，与第一代系统相似存在着许多缺陷，要实现远距离视频传输需铺设(租用)光缆、在光缆两端安装视频光端机设备，系统建设成本高，不易维护且维护费用较大。该系统只适合于传统监控系统的改造，不适合新建的监控系统以及要求远程视频传输(超过1～2公里)的系统。
DVR(digital hard disk video recorder) is the second generation surveillance system which develops rapidly after analog video system in recent years. USES the microcomputer and the Windows platform, installed in the computer video compression card and the corresponding DVR software, different types of video card can connect video 1/2/4 road, support for real-time video and audio, is the first generation analog monitoring system upgrade to realize digital alternatives.
DVR(digital hard disk video recorder)
DVR(digital hard disk video recorder) is the second generation surveillance system which develops rapidly after analog video system in recent years. USES the microcomputer and the Windows platform, installed in the computer video compression card and the corresponding DVR software, different types of video card can connect video 1/2/4 road, support for real-time video and audio, is the first generation analog monitoring system upgrade to realize digital alternatives.
Features of DVR system: video and audio signal acquisition and storage are mainly in digital form with high quality. The system function is relatively strong and perfect. Data can be exchanged with the information system; The application is more flexible. However, due to the limitations of its own technology architecture, digital hard disk video recorder still cannot solve the long time delay in network remote monitoring environment, unable to multiplex monitoring at the same time, high integration problem such as centralized monitoring.
The reason is that the DVR system from point to the monitoring center to simulate transmission way, similar to the first generation system has many defects, in order to realize remote video transmission should be laid (rent), optical cable, optical transceiver equipment on both ends of cable installation video, construction cost is high, not easy to maintenance and maintenance. This system is only suitable for the transformation of the traditional monitoring system, and it is not suitable for the new monitoring system and the system requiring remote video transmission (over 1 ~ 2 km).
NVR(网络视频录像机)
随着Internet、宽带网络技术和信息处理技术的不断发展，近几年，基于Web服务器的远程视频监控,嵌入式DVR系统异军突起，通常称嵌入式DVR为2.5代监控系统,即网络视频录像机NVR。
在视频监控系统中，NVR是模拟录像机和硬盘录像机的理想升级换代产品，是在原来DVR基础上实现的免除视窗操作系统和电脑配合的单机独立操作设备。由于NVR采取高度集成化的芯片技术，拥有先进的数字化录像、存储和重放功能，不需要更换和存储录像带，无需电脑配合和日常维护，因此，能够实现高分辨率(可达到Full-D1分辨率)、高质量实时监控，并且简单易用。
简单来说，NVR系统将传统的视频、音频及控制信号数字化，通过NVR设备上的网络接口，以IP包的形式在网络上传输，在DVR的基础上，实现了系统的网络化。
应用当中，尽管NVR系统具有计算机快速处理能力、数字信息抗干扰能力、便于快速查询记录、视频图像清晰及单机显示多路图像等优点。但是，从本质上来讲，NVR不仅没有解决DVR系统中存在的模拟传输的缺陷，也没有很好地解决网络传输视频流后带来的更多管理问题。实际上，每个NVR形成了一个独立的监控中心，给全网监控的实现造成了更大的复杂性。在诸如远程控制、多层级扩展性以及组网能力等方面，还有待提高。
NVR(network video video recorder)
As the Internet and the continuous development of broadband network technology and information processing technology, in recent years, based on the remote video monitoring Web server, embedded DVR system, usually called embedded DVR 2.5 generation monitoring system, the network video recorder NVR.
In video monitoring system, the NVR is an ideal upgraded to analog video recorder and the hard disk video recorder product, are realized on the basis of the original DVR from Windows operating system and computer with single independent operating equipment. Because NVR to take highly integrated chip technology, with advanced digital video recording, storage and playback function, do not need to change and store video, no computer and daily maintenance, therefore, to achieve high resolution () can achieve Full - D1 resolution, high quality real-time monitoring, and easy to use.
In simple terms, NVR system will be the traditional digital video, audio and control signal, through the NVR device on the network interface, in the form of IP packet transmission in the network, on the basis of the DVR, realize the network of the system.
In application, NVR system has the advantages of fast processing ability of computer, anti-interference ability of digital information, easy to query and record quickly, video image clarity and multi-channel image display by single computer. However, in essence, NVR has not solved the problem of analog transmission in DVR system, nor has it solved more management problems after network transmission of video stream. In fact, each NVR forms a separate monitoring center, which makes the implementation of whole-network monitoring more complicated. In such aspects as remote control, multilevel scalability and networking capabilities, there is still room for improvement.
IPVS(网络视频监控系统)
完全网络化的视频监控系统(IPVS?IPVideoSurveillance)，视频从图像采集设备输出时即为数字信号，以标准Internet网络为传输媒介，基于国际标准TCP/IP协议，采用流媒体技术，实现视频在网上的多路复用传输，并通过设在网上视频流服务器，完成视频流的转发、报警等操作，以实现整个监控系统的指挥、调度、存贮、授权控制等功能。此外报警、门禁、巡更等前端设备输出的数字信号，也可由多网合一的方式，通过网络复用进行传输，并在同一平台上进行管理与控制。
完全网络化视频监控系统IPVS，整个系统全部基于TCP/IP网络协议和标准编码设备实现，用户可以采用标准的网络摄像机、网络设备、网络服务器、网络存储设备和计算机产品建立视频监控系统。IPVS不仅具有传统的本地数字监控系统所具有的计算机快速处理能力、数字信息抗干扰能力、便于快速查询记录、视频图像清晰及单机显示多路图像等优点，而且，能够切实发挥宽带网络的优势，通过IP网络，覆盖范围可以到达的任何地方的监控目标组合成一个完整的、一体化的系统，真正适应目前视频监控系统针对远程、实时、集中控制的需求。用户只需坐在监控室里轻点鼠标，就可以快速完成数字化的搜索和恢复功能，并且，数字化的图像更清晰、更容易被录制和回放。
全IP视频监控系统不仅拥有DVR、NVR的全部优点，同时还有其它更多的长处：完全网络化的IPVS解决方案，可以兼容和支持多种原有模拟视频设备，保护用户投资，保护商业环境等。IPVS系统还可扩展出更多监控分析功能，让视频监控与其他应用集成在同一个企业IT环境中成为可能。另外，IPVS解决方案，在多媒体应用中的数字化、网络化、智能化、系统化及超大规模组网能力等方面，优势也相当突出。
IPVS(network video monitoring system)
Fully networked video monitoring system (IPVS? IPVideoSurveillance), video from the image acquisition device is digital signal, the output of the standard Internet network as the transmission medium, based on international standard TCP/IP protocol, the streaming media technology, the realization of video multiplexing transmission on the Internet, and through the Internet video streaming server, complete the forwarding of a video stream, alarm and other operations, in order to realize the whole monitoring system of command, scheduling, storage, authorization control, and other functions. In addition, the digital signals output by the front-end devices such as alarm, access control and patrol can also be transmitted through network reuse and managed and controlled on the same platform in a way of integrating multiple networks.
Completely IPVS network video monitoring system, the whole system based on TCP/IP network protocol and standard coding equipment, users can use the standard network camera, network equipment, network servers, network storage devices and computer products video monitoring system is established. IPVS not only has the traditional local digital monitoring system of computer digital information processing power, quickly anti-interference ability, facilitate quick query records, video image clarity and single multi-channel image display, and, to play to the advantages of broadband network, through the IP network, coverage can reach any part of the monitoring target combined into a complete, integrated system, to adapt to the current real video monitor system for remote, real-time, centralized control requirements. With just a click of a mouse in the monitor room, users can quickly complete digital search and recovery functions, and digital images are clearer and easier to record and playback.
All IP video surveillance system not only has all the advantages of the DVR, NVR, at the same time there are other more strengths: fully networked IPVS solutions, can be compatible and support a variety of original analog video equipment, protect user investment, business environment protection, etc. IPVS systems can also extend more monitoring and analysis capabilities, making IT possible to integrate video monitoring with other applications in the same enterprise IT environment. In addition, IPVS solutions have significant advantages in digital, networked, intelligent, systematic and large-scale networking capabilities in multimedia applications.
