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Development NVR currently looking mainly divided into two categories, one is the access level embedded NVR, which focused on a mainstream IP camera NVR developed . The other is for large NVR communities and safe city level , which is mainly used in high-end server hardware and software structure, based on the traditional premise NVR software interface , combined with the previous disk array data protection , with powerful data processing capabilities of the large NVR system equipment. The basic functions of the NVR include : ip cameras access , real-time audio and video data broadcast services , audio and video data storage , search and playback, support alarm processing and related logging and inquiries ; addition to the basic functions of key technologies , including the most the basic H.264, MPEG4, MJPEG video compression coding technology support , high-definition camera HDMI, DVI, VGA and other output formats are supported , in data processing , RAID0, 1,5,6,10 and other technical support , streaming media playback time technical support, streaming media technology , as well as architecture and platforms and other back-end database. NVR 's development has been a decade, but its technically there has been technical difficulties, the performance of the following points:Due to the high frame rate high pixel front camera , so the need for more efficient codec protocol, transport protocols and data encapsulation protocol . NVR must have reliable and rapid capacity growth technology , virtualization,cloud storage , NVR can be a single, convenient way to take people into the system for massive storage capacity and the need to handle vast amounts of video data , NVR software required there are efficient data retrieval and management techniques ;intelligent video analysis technology is an important area for future development. The key stage for redundant aggregation and core -level NVR key nodes to ensure system reliability is stable and reliable;HD technology greatly improves video surveillance image quality and clarity , allowing to deepen the precise details of the video image analysis . elements.The key nodes include key components of each node device itself and core equipment ; safe and reliable data protection technology data , and data encryption technology era of big data , but also one of the key bottlenecks and processing echnology . In the moment, under development simulator and ip cameras coexistence , it is difficult to say who will replace whom, but because the market is tiered , and the cost impact of small venues , equipment simulation system includes DVR is still difficult to exit the market , in large systems and high-end market , the current IP system will look to dominate the world , NVR will gradually occupy the mainstream high-end market. Now NVR products compared with a year ago without much change in the core technology, but they have full access to the high-definition era, are equipped with HDMI output interface , a small part of the product is above the level of product aggregation level , some intelligent analysis. But in the network performance of all manufacturers of products there is a certain gap, there is very little product also exist more or less loss of resolution and other issues in the client's local and real-time display resolution, gray scale and so on.The good news is that this test can be done almost all products optimized for color reduction , and has superior color reproduction of the ip cameras.But each product on a larger difference in network latency , excellent product in less than 100 milliseconds , all other products reached more than 200 milliseconds. There are big differences in the operation and use of the client software on the outstanding manufacturers more appropriate use and management of the actual project . On the Compatibility mainstream network surveillance cameras compatible products have been tested in this factory into it, but the effect is uneven, but is compatible with foreign products less NVR manufacturers need to overcome the difficulties of compatibility problems as soon as possible.HD NVR products in the trend has been catching up to cater to the needs of high-definition network camera data,while the core technology for the NVR CPU chipset,board,and other manufacturers have to catch up with the pace of large numbers , this is not NVR manufacturers can overcome the technical challenges alone.
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NVR, ip cameras, high-definition network camera,
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