The NVR is also the product of network monitoring. Before the high-definition surveillance, the NVR appeared as the DVR Terminator. Then in the high-definition surveillance system, the NVR will be a new force and serve as the protagonist in this market. The selection of NVR in HD surveillance system should focus on the following aspects:
1. Image storage
High-definition monitoring will cause an increase in video storage space, so there must be enough storage space for video storage. In a particular professional situation, the storage requirements are even higher. The NVR needs its own storage space, which can be easily expanded when it needs to be expanded. Currently, common storage expansion devices include eSATA arrays and IPSan arrays, which are often an important indicator of the scalability of an NVR.
On the other hand, professional scenes require high security for video recording, and the reliability of storage media will become more important. In general, there are two methods in the industry that can improve the security of storage. One type is disk rotation. In a plurality of disks, only one disk is working at the same time. A non-working hard disk is in a dormant state, which indirectly improves the use of the disk. Life cycle; The second is the use of RAID technology, commonly used in the storage array, for occasional disk failure, the replacement of the disk can easily restore image data. In general, these two characteristics are also the identification of the distinction between commercial and professional systems.
2 image local decoding display
Local decoding of images is the basic feature of NVR products. Due to the need of high-definition image resolution, the NVR is generally required to be able to decode and restore HD camera images. For example, if the camera is 1920*1080, then the NVR should at least support 1920*1080 image display. Because the decoding of high-definition images requires a great deal of resources, if the NVR accesses 16 high-definition images, it is not possible to simultaneously perform 16-channel high-definition simultaneous decoding and display, and it is not necessary. In this case, multi-streaming technology can be used, when a single screen is used, HD decoding shows that multiple pictures decode lower resolution images.
Devices in the local decoding and display generally require VGA interface, high connectivity VGA monitor, and should also have HDMI and other high-definition interface to adapt to more professional applications.
3.ANR function
The positioning of high-definition monitoring application market determines the user's various quality requirements for the monitoring system. A good NVR device should take into account the possible image failure risk due to the elimination of possible network failures, and it must be easy for users to understand and use. . At this time, ANR technology is a very good solution. Both high-definition network cameras and high-definition NVRs require this technical capability to collaborate with storage, which neither wastes storage resources nor causes image loss during failures due to network failure.
4. Access platform to build large applications
From the current point of view, most high-definition monitoring systems are still the industry's private network applications, high-definition image browsing is not limited to the local, but can be applied to all aspects of the industry. Therefore, it is necessary for NVRs and HD network cameras to access large-scale video surveillance management platforms. In this way, high-definition network cameras and small dumbbell-structured groups can form a large application network through interoperability between platforms. In HD systems, whether the backend has the ability to build a large network has become an important measure.