The main products of digital surveillance are analog cameras, DVR and DVS;and the main products of network video surveillance are ip cameras and NVR. People are more concerned about the "high definition" and "smart" now, which also represents the development direction of the video surveillance. But the DVR is still the most popular products, analog cameras are still the mainstream image acquisition equipment, network camera are mainly used to meet the high-definition requirements of the occasion. By hybrid H-DVR Digital Video Recorder definition, it is not difficult to see that hybrid DVR is a multi-product, good to promote the transition to the era of network video surveillance from digital video surveillance; and because it can access analog signals, they can access the new high-definition network video smaller cost HD monitoring system transformation, it appears to fill the blank stage of the transition to all-IP surveillance digital video surveillance technology from the analog-to-digital hybrid. Since H-DVR concept is proposed in 2009 and has been to promote the the hybrid DVR has played an irreplaceable role in the process to promote high-definition network video surveillance system, especially in the finance, public security and industrial applications such as the great promotion because of its cross-border flexible. Users already familiar with the hybrid DVR, hybrid DVR has become an important part of the video surveillance system. However, due to the application of network cameras is not yet "civilian", the DVR is still the main product of the civil security market, H-DVR is still mainly in the higher end of the industry to achieve the upgrading of the existing analog system compatible HD monitor. Hybrid the DVR both traditional DVR and NVR functionality, its core technology, functional requirements are often both the actual choice should also be considered. The first thing to note is the access capability of the remote ip camera that could satisfy both the number of road 1080p HD video access and meet the remote preview how many roads 1080p HD video. HD network video network bandwidth occupied by more 1 Road 1080p video often requires a 6-8Mbps network bandwidth, one-way 720p video often requires a 3-4Mbps network bandwidth. 16-way hybrid DVR, for example, 16 720p, the 8 Road 1080p network video access, access to the remote ip camera will need to access bandwidth of 64M respectively forwarding a road at least in need 64M access bandwidth plus 16 analog channels, the network output also needs to 32M, 160M bandwidth throughput. Practical application in hybrid DVR network output is often more than one road in each channel bandwidth throughput put forward higher requirements. Hybrid DVR choice, not only need to focus on remote ip camera access capability, also need to make sure the network throughput capacity of the hybrid DVR. Consumer video applications, video clarity is an eternal topic. Security and video surveillance, demand more and more of the "HD" is mentioned. HD is fully compatible with the higher requirements of video surveillance products, that requires not only the acquisition of network video HD storage, Preview playback video HD. Mainstream hybrid DVR often with HD output interface, the ability to high-definition display, but also need to consider the hybrid DVR video processing capabilities that support both the number of road HD video decoding, support the simultaneous playback of high-definition video of the number of road This is also a measure of the mixed the DVR performance of the key parameters; practical applications, especially in phased projects or renovation projects often require access to a number of brands of hd ip camera, hybrid DVR compatibility issues for multi-brand network cameras also equipment selection must consider the elements; the relative analogue cameras is more complicated network camera access, ease of access for network cameras, can support the network camera automatically search add simple configuration, but also the actual The need to consider the application. With the development of hd ip camera and other security products, network cameras, hybrid DVR and NVR has been a great development, but the lack of access and management of network cameras unified industry standard, the phenomenon embodied NVR products more obvious. NVR products varied shapes and obvious application differentiation due to different market positioning of the various manufacturers, technology accumulation, most of the customers for network video surveillance system cognitive limitations and lack of experience, so product differentiation not only did not give users a variety of options, but brought chaos and user of the product function and morphology in confusion. Hybrid DVR also more or less affected, giving users a choice of confusing and confused. From the point of view of monitoring the actual application, network access not only need the network video access come complete video management should be better. General network camera management should include the following features: support for network configuration, network cameras coding equipment encoding parameters (resolution, bit rate, frame rate, etc.), the video input signal parameters (brightness, contrast, chroma, saturation, etc.) ; motion detection (motion detection area, sensitivity) to support configuration front-end network equipment, alarm signal (arming time, signal types), video shielding (shielding region, sensitivity); receiving all kinds of alarm information to support the front-end network equipment and linkage operation; support for network cameras, network PTZ dome control. We have to realize, hybrid DVR should not just be satisfied with the network camera access, storage, but also the management of network video, the point is ignored when the product selection easy part. Otherwise contrast with mature analog systems, network video application will "greatly reduced", it is difficult to really impress users.
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