IP Cameras
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an internet protocol camera, or ip camera, is a type of digital video camera commonly employed for surveillance, and which unlike analog closed circuit television (cctv) cameras can send and receive data via a computer network and the internet. Although most cameras that do this are webcams, the term "ip camera" or "netcam" is usually applied only to those used for surveillance.
there are two kinds of ip cameras:
centralized ip cameras, which require a central network video recorder (nvr) to handle the recording, video and alarm management.
decentralized ip cameras, which do not require a central network video recorder (nvr), as the cameras have recording functionality built-in and can thus record directly to digital storage media, such as flash drives, hard disk drives or network attached storage.
analog closed circuit television uses established broadcast television formats (e.g. Common intermediate format (cif), ntsc, pal, and secam). Generally speaking, each make of ip camera will differ in its features and functions, video encoding (compression) schemes, supported network protocols, and the api to be used by video management software.
in order to address issues of standardization of ip video surveillance, two industry groups were formed in 2008: the open network video interface forum (onvif) and the physical security interoperability alliance (psia). While the psia was founded by 20 member companies including honeywell, ge security and cisco, and onvif was founded by axis communications, bosch and sony, each group now has numerous members.
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