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        IP camera's history and Potential advantages
        2013-11-5
             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:
        1.Centralized IP cameras, which require a central Network Video Recorder(NVR) to handle the recording, video and alarm    management.
        2.Decentralized IP cameras, which do not require a central Network Video Recorder (NVR), as the cameras have recording  
        function built-in and can thus record directly to local storage media, such as flash drives and hard disk drives or to standard network attached storage.
         
        History
             The first centralized IP camera was released in 1996 by Axis Communications.[1] It was called the Axis Neteye 200 and was developed by the team of Martin Gren and Carl-Axel Alm. It used a custom web server internal to the camera. In late 1999, the company started using embedded Linux to operate its cameras. Axis also released documentation for its low-level API called "VAPIX", which builds on the open standards of HTTP and real time streaming protocol (RTSP). This open architecture was intended to encourage third-party software manufacturers to develop compatible management and recording software.
             The first decentralized IP camera was released in 1999 by Mobotix.[citation needed] The camera's Linux system contained video, alarm, and recording management function, thus the camera system did not require licensed video management software to manage the recording event, or video management.
            The first IP camera with onboard video content analytics (VCA) was released in 2005 by Intellio.[citation needed] This camera was able to detect a number of different events, such as if an object was stolen, a human crossed a line, a human entered a predefined zone, or if a car moved in the wrong direction.
             IP cameras are available at resolutions from 0.3 (VGA resolution) to 29 megapixels.[2] As in the consumer TV business, in the early 21st century, there has been a shift towards high-definition video resolutions, e.g. 720p or 1080i and 16:9 widescreen format.
        Potential advantages
             Two-way audio via a single network cable allows users to communicate with what they are seeing (e.g. gas station clerk assisting a customer on how to use the prepay pumps)
        Flexibility: IP cameras can be moved around anywhere on an IP network (including wireless).
             Distributed intelligence: with IP cameras, video analytics can be placed in the camera itself allowing scalability in analytics solutions.[3]
             Transmission of commands for PTZ (pan, tilt, zoom) cameras via a single network cable.
             Encryption & authentication: IP cameras offer secure data transmission through encryption and authentication methods such as WEP, WPA, WPA2, TKIP, AES.
             Remote accessibility: live video from selected cameras can be viewed from any computer, anywhere, and also from many mobile smartphones and other devices.
             IP cameras are able to function on a wireless network.[citation needed]
        PoE - Power over ethernet. Modern IP cameras have the ability to operate without an additional power supply. They can work with the PoE-protocol which gives power via the ethernet-cable
         
          network camera
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