siliconindia | | December 20199(640 x 480 pixels), SVGA (800 x 600 pixels) or quad ­ VGA (1280 x 960 pixels, also referred to as `megapixel') resolutions.An analogue or digital camera connected to a vid-eo server acts as a network camera, but the image size is restricted to that of the video standard of the camera. However, optics (lenses and image sensors), not vid-eo resolutions, are the components that determine the image quality.Network cameras can be used for very cheap sur-veillance solutions (requiring one network camera, some Ethernet cabling and one PC), or to replace entire CCTV installations (cameras become network cameras, tape recorders become DVRs, and CCTV monitors be-come Computer with LED screens and specialized soft-ware. Digital Video Manufacturers claim that turning CCTV installations into Digital Video installations in inherently better).What is an IP Camera?An Internet Protocol Camera or IP camera is a type of Digital Video Camera commonly employed for surveil-lance, and which, unlike analogue CCTV Cameras, can send and receive data via a computer network and the in-ternet. Although most cameras that do this are webcams, the term IP Camera is usually applied only to those used for surveillance. There are two kinds of IP Cameras:1. Centralized IP cameras, which require a central video recorder (NVR) to handle the recording, video and alarm management.2. Decentralized IP cameras, which do not require a central NVR, as the cameras have recording function built-in and can record directly to any standard storage media, such as SD cards, NAS (Network Attached Stor-age) or a PC/ServerIP cameras may differ from one another in features and functions, video encoding (compression) schemes, available network protocols, and the API to be used by Video Management software.Advantages of IP CameraIP Cameras are widely considered as the wave of the fu-ture for security camera surveillance systems. IP cameras which transmitted video signals as a voltage; instead, IP camera images are sent using the transmission and securi-ty features of the TCP/IP protocol, which provide numer-ous benefits.· Two way audio via a single network cable allows users to listen to and speak to the subject of the audio.· The use of a Wi-Fi or wireless network· Distributed intelligence such as video analytics can be placed in the camera itself allowing the camera to analyze images· Transmission of commands for PTZ (Pan, Tilt and Zoom) cameras via a single network· Secure data transmission through encryption and au-thentication methods such as WPA, WPA2, TKIP, AES.· Remote accessibility, which allows live video from selected camera to be viewed from any computer, mobile smartphones and other devices· PoE (Power over Ethernet) to supply power through Ethernet cable and operate without a dedicated power supply An analogue or digital camera connected to a video server acts as a network camera, but the image size is restricted to that of the video standard of the camera
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