It differs from broadcast television in that the signal is not transmitted openly, although it may use point-to-point (P2P), point-to-multipoint (P2MP), or wired or wireless links. closed circuit television.
Although nearly all video cameras meet this definition, the term is often applied to those used for surveillance in areas that require additional security or continuous monitoring.
On the one hand, video telephony is rarely called “CCTV” and it is one exception for using video in distance education, as it is an important tool.
Monitoring the audience with CCTV is common in many regions around the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras attached to the chest or head of a police officer.
Video surveillance has sparked a major debate about balancing its use with individuals’ right to privacy, even in public places.
In industrial facilities, CCTV equipment can be used to monitor portions of the process from a central control room, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a specific event.
A more advanced form of CCTV, using digital video recorders (DVRs), provides the ability to record for many years, with a variety of quality and performance options and additional features (such as motion detection and email alerts).
More recently, decentralized IP cameras, which may be equipped with mega-pixel sensors, support recording directly to networked storage devices, or an internal flash for completely independent operation.
According to one estimate, there will be approximately one billion surveillance cameras in use worldwide by 2021. About 65% of these cameras are installed in Asia.
CCTV growth has slowed in recent years. The diffusion of this technology has facilitated a significant growth in state surveillance, a significant increase in advanced social surveillance and control methods, and a host of crime prevention measures worldwide.