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  • The introduction of digital video server(DVS) and DVR


        In addition to traditional analog cameras and analog monitors CCTV surveillance equipment in the present field of video surveillance, network cameras, digital video server (DVS), and DVR is a hot term in recent years, three. Contractors and end users, consider building a video surveillance system, usually face in between the three comparison and selection, especially considering building a digital, networked video surveillance system, especially .
        Overall, the network camera is more obvious advantages and characteristics of the aromatic plane in the functional performance, it is easy to decide whether to adopt this type of equipment according to their actual needs. But if you need video servers and DVR to make a clear choice for many engineering companies and end users in terms of, it is not an easy task. Indeed, on the surface, the similarities of these two types of product features and applications fang face too much, they need to with analog cameras, we need the analog video and audio signals are digitized, supported by the video image compression format roughly the same. In contrast to their actual needs, it seems that the video server or DVR. In many cases, the user may be only two types of products, Kam line price Fong surface to make the final choice. Compared to the video server, especially compared with the well-known international manufacturers of video server products, the domestic manufacturers produce DVR products with a strong price advantage, perhaps the DVR in the domestic sales of the video server sales to be higher a lot of reasons one.
        In fact, from a professional point of view, video servers and DVR are two very different products, their intelligence, scalability, openness, integration, reliability, application mode, and many other relations to the video surveillance system an important factor in overall performance and cost-fang surface are significantly different.
        Network Camera
        Network Camera (NetworkCamera) are also commonly referred to as IP cameras (IPCamera) or IP camera. They are the product of a highly integrated, can be seen as an ordinary camera and a micro-computer combination, can also be seen as a combination of an analog camera and a video server.The network camera can be divided into many types according to different criteria, such as HD IP CameraOutdoor IP Camera、PTZ IP Camera、Home IP Camera、Waterproof IP Camera、Dome IP Camera and so on.
        A network camera functions can be divided into the camera and computer / Web server. Part of the camera optical components include lenses, filters, image sensors, image acquisition and optical / electrical conversion, is about to form a variety of optical signal of the image into electrical signals, but also exposure control, shutter control, white balance adjustment, brightness, chroma adjustment, and backlight compensation common image adjustments. Computer / Web server part of the structure and the video server is basically the same, including image compression chip, the CPU and memory, network interfaces, and alarm input and output control interface. Function of this part is also very similar and video servers, is mainly responsible for the digital image compression and transmission through the network, is also responsible for motion detection, alarm event management, image overlay text or LOGO, IP address filtering, HTTPS smart functionality, such as encryption, as well as HTTP, FTP, SMTP, SNMP and other network services.
        DVR (Digital Video Recorder)
        DVR (DigitalVideoRecorder), usually known as the Digital Video Recorder, a variety of forms of such products on the market today, including the DSP-based embedded DVR PC card-based DVR and quasi-embedded DVR, and ASIC-based embedded DVR. Embedded DVR has a strong advantage in stability and processing power Fong surface is gradually become the mainstream products on the market. Typical DSP-based embedded DVR device analog / digital conversion, image processing and compression, the CPU and memory, storage devices, peripheral drivers, network interface, serial interface and alarm interface function modules. There are also some products very analog video segmentation and video switching functions are also integrated into the circuit board.
        Video signal coming from the front-end analog cameras, part of the loop-through output to a regular analog monitor, the other part is sent to the DSP chip for image processing and compression after A / D conversion, re-written by the CPU to the storage which the equipment, digital video signal can also be transmitted over the network to the remote client. Video playback, the CPU in the storage device to read the corresponding data, and after the D / A converter to the analog monitor. In addition, the CPU also need to deal with a variety of peripheral control commands, and perform the appropriate action.
        With the growing popularity of network video surveillance market has emerged a new DVR products, designed for recording digital video signals from a network camera or video server, this product is usually called NVR (NetworkVideoRecorder).
        The video server has many features better than the DVR, of course, this does not mean that all users should be immediately set aside the DVR products and the choice of video servers, or to choose according to their actual needs. Overall, the video server suitable for building a distributed intelligence, large-scale, monitoring the distribution of the very broad area of ​​video surveillance systems; DVR is suitable to build more small, intelligent requiring a lower level of monitoring point range than small video surveillance system.
        DVR is indeed a milestone in CCTV technology development process, but not as most people think, as a final resolving the Fong case. The video server has a lot of advantages, but still not the final solution to the Fang case. In fact, the future of video surveillance should be a truly all-digital equipment - network camera. All the advantages of network cameras in addition to have to have the video server features, it also has the following prominent features:
        Uses progressive scan technology, the end of the interlaced scanning;
        Support the PoE function, significantly reduce cabling costs, system reliability;
        Millions of pixels or even higher resolution, ultra-clear video;
        Integrated audio, PTZ control and input and output ports, greatly reducing the wiring requirements;
        True all-digital resolving the Fong case, the image only after the first analog / digital converter.
        As network technology continues to development and popularization, the full digital IP video monitoring systems have become an inevitable trend, digitization of video monitoring equipment can make the user can be its applications from dedicated equipment (DVR) transferred to the open system which also enables users to take full advantage of the advantages of networking, digital and intelligent, all this will constitute a powerful promotion, so that more and more users to select the network camera or video server products.

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