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IP cameras or network cameras are digital video cameras, plus an embedded video server having an IP address, capable of streaming the video (and sometimes, even audio). [3] Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than closed-circuit television 'CCTV' analogue cameras are ...
Camera manufacturers often quote view screens in 'number of dots'. This is not the same as the number of pixels, because there are 3 'dots' per pixel – red, green and blue. For example, the Canon 50D is quoted as having 920,000 dots. [15] This translates as 307,200 pixels (×3 = 921,600 dots). Thus the screen is 640×480 pixels. [16]
For added security centralized storage is frequently used to record alarm video for easy alarm verification and long-term secure storage. Pre-alarm recording is offered by introducing a buffer in the encoder so that the seconds or minutes of video before and after an alarm can be automatically transmitted to the centralized storage.
Soviet motorized CCTV camera. In 2017, in Russia, the Moscow network included 160,000 CCTV cameras and 95 percent of residential buildings; over 3,500 Russian cameras were connected to the General Centre for Data Storage and Processing. [113] Video recordings are used to solve 70 percent of offenses and crimes. [114]
HDcctv (High Definition Closed Circuit Television) is an open industrial standard for transmitting uncompressed high-definition analog (AHD) or digital video over point-to-point coaxial cable links for video surveillance applications.
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The basis for digital video cameras is metal–oxide–semiconductor (MOS) image sensors. [1] The first practical semiconductor image sensor was the charge-coupled device (CCD), invented in 1969 [2] by Willard S. Boyle, who won a Nobel Prize for his work in physics. [3]
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