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Tuesday, January 13, 2009

CCTV and Its Limitation

Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, limited set of monitors and an extremely important
tool in the fight against crime, acting as both a crime deterrent and a source of
evidence in court.

It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point wireless links. CCTV is often used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations and convenience stores.

The increasing use of CCTV in public places has caused a debate over public surveillance versus privacy. People can also buy consumer CCTV Systems for personal, private or commercial use. A more advanced form of CCTV, utilizing Digital Video Recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion-detection and email alerts).

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room; when, for example, the environment is not comfortable for humans. CCTV systems may operate continuously or only as required to monitor a particular event.

The benefites of CCTV are below:
1.Crime prevention / evidence
2.Industrial processes
3.Traffic monitoring
4.Transport safety
6.Technological developments
7.Computerised monitoring
8.Retention, storage and preservation
9.Closed-circuit digital photography (CCDP)

Limitations of CCTV

One of the key limitations of CCTV is the amount of cabling associated with a traditional network, which makes the service hard to expand and highly restrictive. If a camera needs to be moved or a new camera needs to be added to the network, a complete new cable is often required. Traditional CCTV systems were also designed for point-to-point transmission of video from a camera to a recorder on the same site.

There are numerous disadvantages to this as the tapes need to be changed and stored, recording needs to be monitored and, as they are stored on magnetic tape, images are susceptible to being damaged or lost.

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