Closed-circuit television

A television system that sends video to a limited set of monitors rather than broadcasting it to the public. It is commonly used to observe and record places or activities.

Video camera: A device that captures moving images and converts them into electronic or digital video signals. Cameras provide the visual input that a closed-circuit system distributes.
Video surveillance: The monitoring of people, places, or activities through video cameras. Closed-circuit television is a principal technology used for video surveillance.
Analog television: A television system that represents image and sound information with continuously varying electrical signals. Early closed-circuit systems commonly carried analog television signals.
Privacy: The ability of individuals to control access to information about themselves and their activities. Cameras can collect identifiable information in spaces where people expect varying degrees of privacy.
John Logie Baird: A Scottish engineer who developed early mechanical television systems and demonstrated television transmission. His early television work formed part of the technology background for video systems.
Video transmission: The transfer of video signals between cameras, recording equipment, and displays. Transmission links cameras to monitors and recorders across a system.
Security alarm: A system that detects a security hazard or intrusion and signals an alert. Camera systems are often paired with alarms to verify or investigate alerts.
Internet Protocol camera: A camera that captures video and sends it as digital data over an Internet Protocol network. IP cameras make network-based closed-circuit systems possible.
Data protection: Legal and organizational rules governing the collection, use, storage, and sharing of personal data. Recorded footage may contain personal data and require safeguards.
Vladimir K. Zworykin: A Russian-American engineer whose work helped develop electronic television camera and display technologies. Electronic imaging and display advances enabled practical television-based monitoring.

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