| 词条 | Network video recorder |
| 释义 |
A network video recorder (NVR) is a specialized computer system that includes a software program[1] that records video in a digital format to a disk drive, USB flash drive, SD memory card or other mass storage device. An NVR contains no dedicated video capture hardware. However, the software is typically run on a dedicated device, usually with an embedded operating system. Alternatively, to help support increased functionality and serviceability, standard operating systems are used with standard processors and video management software. An NVR is typically deployed in an IP video surveillance system. Network video recorders are distinct from digital video recorders (DVR) as their input is from a network rather than a direct connection to a video capture card or tuner. Video on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then streamed to the NVR for storage or remote viewing.{{cn|date=September 2012}} Additional processing may be done at the NVR, such as further compression or tagging with meta data. Hybrid NVR/DVR surveillance systems exist which incorporate functions of both NVR and DVR; these are considered a form of NVR.{{cn|date=September 2013}} NVR home surveillance systems are generally wireless, tend to be easy to set up, can be accessed through a web browser, and allow the user to be notified by email if an alarm is triggered. See also
References1. ^{{Cite news|url=https://kintronics.com/solutions/ip-camera-systems/video-recording-systems/network-video-recorder/|title=Network Video Recorder {{!}} NVR and Video Management Systems for IP Cameras|work=Kintronics|access-date=2018-10-23|language=en-US}} Видеорегистратор#Сетевые видеорегистраторы (NVR) 3 : Video hardware|Digital video recorders|Video surveillance |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。