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Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. [1] Video was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) systems, which, in turn, were replaced by flat-panel displays of several types.
Digital video comprises a series of digital images displayed in rapid succession. In the context of video, these images are called frames. [e] The rate at which frames are displayed is known as the frame rate and is measured in frames per second. Every frame is a digital image and so comprises a formation of pixels.
The application of audiovisual systems can be found in collaborative conferencing (which includes video-conferencing, audio-conferencing, web-conferencing, and data-conferencing), presentation rooms, auditoriums and lecture halls, command and control centers, digital signage, and more. Concerts and corporate events are among the most obvious ...
A video management system, also known as video management software plus a video management server, is a component of a security camera system that in general: Collects video from cameras and other sources. Records / stores that video to a storage device. Provides an interface to both view the live video, and access recorded video.
A network video recorder ( NVR) is a specialized computer system that records video [1] to a disk drive, USB flash drive, memory card, or other mass storage device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an IP video surveillance system. NVRs typically have embedded operating systems .
NTSC (from National Television Standards Committee) is the first American standard for analog television, published in 1941. [ 1] In 1961, it was assigned the designation System M. It is also known as EIA standard 170. [ 2] In 1953, a second NTSC standard was adopted, which allowed for color television broadcast compatible with the existing ...