CLOSED-CIRCUIT TELEVISION (CCTV), also known as VIDEO SURVEILLANCE, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint (P2MP), or mesh wired or wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants, military installations, convenience stores and other areas where security is needed. Though Videotelephony is seldom called "CCTV" one exception is the use of video in distance education , where it is an important tool.
In industrial plants, CCTV equipment may be used to observe parts of a 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 particular event. 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). More recently, decentralized IP cameras , some equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.
There are about 350 million surveillance cameras worldwide as of 2016. About 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years.
* 1 History
* 1.1 Technology * 1.2 Application
* 2 Uses
* 2.1 Crime prevention * 2.2 Industrial processes * 2.3 Traffic monitoring * 2.4 Transport safety * 2.5 Sporting events * 2.6 Monitor employees * 2.7 Use in schools * 2.8 Criminal use * 2.9 Home security
* 3 Prevalence
* 6 Technological developments
* 6.1 Computer-controlled analytics and identification
* 6.2 Retention, storage and preservation
* 6.3 Closed-circuit digital photography (CCDP)
* 6.4 IP cameras
* 6.5 Networking CCTV cameras
* 6.6 Integrated systems
* 6.7 Wireless security cameras
* 7 Countermeasures * 8 CCTV camera vandalism
* 9 Cost
* 9.1 Factors affecting security camera installation cost
* 10 See also * 11 Notes * 12 References * 13 Further reading * 14 External links
Closed circuit TV monitoring at the Central
The first CCTV system was installed by
In the U.S. the first commercial closed-circuit television system became available in 1949, called Vericon. Very little is known about Vericon except it was advertised as not requiring a government permit.
The earliest video surveillance systems involved constant monitoring because there was no way to record and store information. The development of reel-to-reel media enabled the recording of surveillance footage. These systems required magnetic tapes to be changed manually, which was a time consuming, expensive and unreliable process, with the operator having to manually thread the tape from the tape reel through the recorder onto an empty take-up reel. Due to these shortcomings, video surveillance was not widespread. VCR technology became available in the 1970s, making it easier to record and erase information, and use of video surveillance became more common.
During the 1990s, digital multiplexing was developed, allowing several cameras to record at once, as well as time lapse and motion-only recording. This increased savings of time and money which then led to an increase in the use of CCTV.
Recently CCTV technology has been enhanced with a shift toward Internet-based products and systems, and other technological developments.
In September 1968,
Olean, New York
Experiments in the UK during the 1970s and 1980s, including outdoor
The two-year-old James Bulger being led away by his killers, recorded on shopping centre CCTV in 1993. This narrow-bandwidth television system had a low frame rate .
A 2009 analysis by Northeastern University and the University of
Cambridge, "Public Area CCTV and
The results from the above 2009 "Public Area CCTV and Crime Prevention: An Updated Systematic Review and Meta-Analysis", are somewhat controversial. Earlier similar meta-analysis completed by Walsh and Farrington in 2002 showed similar results: a significant decrease in car park or parking lot crime (41%), and a non-significant decrease of crime in public transit and public places. This study was criticised for the inclusion of confounding variables (e.g. notification of CCTV cameras on site, improved street lighting) found in the studies analyzed (including car park studies). These factors could not be differentiated from the effect of CCTV cameras being present or absent while crimes were being committed. Thus, a combination of factors might be important for the decrease in crime not just the CCTV cameras. The 2009 study admitted to similar problems as well as issues with the consistency of the percentage of area covered by CCTV cameras within the tested sites (e.g. car parks have more cameras per square inch than public transit). Another question in the effectiveness of CCTV for policing is around uptime of the system; in 2013 City of Philadelphia Auditor found that the $15M system was only operational 32% of the time. There is still much research to be done to determine the effectiveness of CCTV cameras on crime prevention before any conclusions can be drawn. Closed-circuit video cameras in the Navy Yard complex caught gunman Aaron Alexis during his shooting rampage.
One study finds that the introduction of surveillance cameras to Stockholm subway stations reduced crime by approximately 25%, with 15% of the deterred crimes appearing to have been displaced to the area surrounding the stations where cameras were not used.
There is strong anecdotal evidence that CCTV aids in detection and conviction of offenders; indeed UK police forces routinely seek CCTV recordings after crimes. Moreover, CCTV has played a crucial role in tracing the movements of suspects or victims and is widely regarded by antiterrorist officers as a fundamental tool in tracking terrorist suspects. Large-scale CCTV installations have played a key part of the defences against terrorism since the 1970s. Cameras have also been installed on public transport in the hope of deterring crime, and in mobile police surveillance vehicles, often with automatic number plate recognition , and a network of APNI-linked cameras is used to manage London\'s congestion charging zone . Even so, there is political hostility to surveillance and several commentators downplay the evidence of CCTV's effectiveness, especially in the US. However, most of these assertions are based on poor methodology or imperfect comparisons.
A more open question is whether most CCTV is cost-effective. While
low-quality domestic kits are cheap the professional installation and
maintenance of high definition CCTV is expensive. Gill and Spriggs
Cost-effectiveness analysis (CEA) of CCTV in crime prevention
that showed little monetary saving with the installation of CCTV as
most of the crimes prevented resulted in little monetary loss.
Critics however noted that benefits of non-monetary value cannot be
captured in a traditional Cost Effectiveness Analysis and were omitted
from their study. A 2008 Report by UK
Cities such as Manchester in the UK are using DVR -based technology to improve accessibility for crime prevention.
In October 2009, an "Internet Eyes" website was announced which would pay members of the public to view CCTV camera images from their homes and report any crimes they witnessed. The site aimed to add "more eyes" to cameras which might be insufficiently monitored. Civil liberties campaigners criticized the idea as "a distasteful and a worrying development".
In 2013 Oaxaca hired deaf police officers to lip read conversations to uncover criminal conspiracies.
In Singapore, since 2012, thousands of CCTV cameras have helped deter loan sharks, nab litterbugs and stop illegal parking, according to government figures.
Industrial processes that take place under conditions dangerous for
humans are today often supervised by CCTV. These are mainly processes
in the chemical industry , the interior of reactors or facilities for
manufacture of nuclear fuel .
Many cities and motorway networks have extensive traffic-monitoring
systems, using closed-circuit television to detect congestion and
notice accidents. Many of these cameras however, are owned by private
companies and transmit data to drivers'
The UK Highways Agency has a publicly owned CCTV network of over 3000 Pan-Tilt-Zoom cameras covering the British motorway and trunk road network. These cameras are primarily used to monitor traffic conditions and are not used as speed cameras . With the addition of fixed cameras for the Active Traffic Management system, the number of cameras on the Highways Agency's CCTV network is likely to increase significantly over the next few years.
London congestion charge
Other surveillance cameras serve as traffic enforcement cameras .
A CCTV system may be installed where any example, on a subway train, CCTV cameras may allow the operator to confirm that people are clear of doors before closing them and starting the train.
Many sporting events in the
See also: Employee monitoring
Organizations use CCTV to monitor the actions of workers. Every action is recorded as an information block with subtitles that explain the performed operation. This helps to track the actions of workers, especially when they are making critical financial transactions, such as correcting or cancelling of a sale, withdrawing money or altering personal information.
Actions which an employer may wish to monitor could include:
* Scanning of goods, selection of goods, introduction of price and quantity; * Input and output of operators in the system when entering passwords; * Deleting operations and modifying existing documents; * Implementation of certain operations, such as financial statements or operations with cash; * Moving goods, revaluation scrapping and counting; * Control in the kitchen of fast food restaurants; * Change of settings, reports and other official functions.
Each of these operations is transmitted with a description, allowing detailed monitoring of all actions of the operator. Some systems allow the user to search for a specific event by time of occurrence and text description, and perform statistical evaluation of operator behaviour. This allows the software to predict deviations from the standard workflow and record only anomalous behaviour.
USE IN SCHOOLS
In the United States, Britain, Australia and New Zealand, CCTV is widely used in schools due to its success in preventing bullying , vandalism , monitoring visitors and maintaining a record of evidence in the event of a crime. There are some restrictions on installation, with cameras not being installed in an area where there is a "reasonable expectation of privacy ", such as bathrooms, gym locker areas and private offices (unless consent by the office occupant is given). Сameras are generally acceptable in hallways, parking lots, front offices where students, employees, and parents come and go, gymnasiums, cafeterias, supply rooms and classrooms. The installation of cameras in classrooms may be objected to by some teachers.
Criminals may use surveillance cameras to monitor the public. For example, a hidden camera at an ATM can capture people's PINs as they are entered, without their knowledge. The devices are small enough not to be noticed, and are placed where they can monitor the keypad of the machine as people enter their PINs. Images may be transmitted wirelessly to the criminal.
In the early to mid 2000s, companies including ADT , LiveWatch , and SimpliSafe started offering CCTVs to the consumer market for home safety and security. Cameras typically come as part of alarm monitoring packages that may also include fire and flood detection.
A crowdsourced map of CCTV cameras near
Grande Arche using
There are an estimated 350 million surveillance cameras worldwide as of 2016 compared with about 160 million in 2012. About 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years.
There were an estimated 30 million surveillance cameras in the United
States in 2011.
In the United Kingdom, the vast majority of CCTV cameras are not
operated by government bodies, but by private individuals or
companies, especially to monitor the interiors of shops and
businesses. According to 2011 Freedom of
Although specific legalities of running a home CCTV system in the UK are rather vague there are published rules and regulations that although are mostly common sense, do include some laws that most people may not be aware of, including registering with ICO as a data controller if any CCTV camera catch images of any of the public on, or outside of your property.
An article published in CCTV
The Cheshire figure is regarded as more dependable than a previous
study by Michael McCahill and Clive Norris of UrbanEye published in
2002. Based on a small sample in
Putney High Street, McCahill and
Norris extrapolated the number of surveillance cameras in Greater
The CCTV User Group estimated that there were around 1.5 million private and local government CCTV cameras in city centres, stations, airports, and major retail areas in the UK. This figure does not include the smaller surveillance systems such as those that may be found in local corner shops and is therefore broadly in line with the Cheshire report.
Research conducted by the Scottish Centre for
Defra made it legal in 2017 to have all Abbatoirs in the UK now covered by CCTV to prevent cruelty to animals during the slaughter process.
Project SCRAM is a policing effort by the Halton Regional Police Service to register and help consumers understand the complex issues of privacy and safety that confront households when dealing with installations of home security systems. "The SCRAM program enables community members to voluntarily identify and register their residential video surveillance equipment through a simple, secure, confidential, online form .". It has not been extended to commercial businesses. A wide-ranging effort to provide registration and monitoring of home security and systems. "Security camera registration and monitoring is a community-based crime prevention opportunity and investigative tool that enlists the help of residents and can help prevent crime on three levels. Residential video surveillance cameras can deter criminals from entering the area, can prevent crimes from occurring and help solve crimes by providing valuable evidence to the police ."
In South Africa due to the high crime rate CCTV surveillance is widely prevalent but the country has been slow to implement the latest technology e.g. the first IP camera was released in 1996 by Axis Communications but IP cameras didn't arrive in South Africa till 2008. In order to regulate the number of suppliers in 2001 the Private Security Industry Regulation Act was passed requiring all security companies to be registered with the Private Security Industry Regulatory Authority (PSIRA).
AROUND THE WORLD
In Latin America, the CCTV market is growing rapidly with the increase of property crime. In Asia, different human activities attracted the use of surveillance camera systems and services, including but not limited to business and related industries, transportation, sports, and care for the environment.
VIDEO SURVEILLANCE AND TERRORISM
Material collected by surveillance cameras has been used as a tool in post-event forensics to identify tactics, techniques and perpetrators of terrorist attacks. Furthermore, there are various projects − such as INDECT − that aim to detect suspicious behaviours of individuals and crowds. It has been argued that terrorists won't be deterred by cameras, that terror attacks aren't really the subject of the current use of video surveillance and that terrorists might even see it as an extra channel for propaganda and publication of their acts. In Germany calls for extended video surveillance by the country's main political parties, SPD , CDU and CSU have been dismissed as "little more than a placebo for a subjective feeling of security".
A mobile closed-circuit TV van monitoring a street market
Many civil liberties campaign groups, academics and consultants have
published research papers into CCTV systems. Opponents of CCTV point
out the loss of privacy of people under surveillance, and the negative
impact of surveillance on civil liberties . Furthermore, they argue
that CCTV displaces crime, rather than reducing it. Critics often dub
CCTV as "Big Brother surveillance", a reference to
Proponents of CCTV cameras argue that cameras are effective at deterring and solving crime, and that appropriate regulation and legal restrictions on surveillance of public spaces can provide sufficient protections so that an individual's right to privacy can reasonably be weighed against the benefits of surveillance. However, anti-surveillance activists have held that there is a right to privacy in public areas. Furthermore, while it is true that there may be scenarios wherein a person's right to public privacy can be both reasonably and justifiably compromised, some scholars have argued that such situations are so rare as to not sufficiently warrant the frequent compromising of public privacy rights that occurs in regions with widespread CCTV surveillance. For example, in her book Setting the Watch: Privacy and the Ethics of CCTV Surveillance, Beatrice von Silva-Tarouca Larsen argues that CCTV surveillance is ethically permissible only in "certain restrictively defined situations", such as when a specific location has a "comprehensively documented and significant criminal threat". Her central reasoning is that widespread CCTV surveillance violates citizens' rights to privacy and anonymity within the public sphere by jeopardizing both their liberty and dignity. She concludes that CCTV surveillance should therefore be reserved for specific circumstances in which there are clear and reasonably demonstrated benefits to its implementation and few ethical compromises.
All countries in the
A 2007 report by the UK
In 2012, the UK government enacted the Protection of Freedoms Act
which includes several provisions related to controlling and
restricting the collection, storage, retention, and use of information
about individuals. Under this Act, the
COMPUTER-CONTROLLED ANALYTICS AND IDENTIFICATION
Computer-controlled cameras can identify, track, and categorize objects in their field of view.
VIDEO CONTENT ANALYSIS (VCA) is the capability of automatically analyzing video to detect and determine temporal events not based on a single image . As such, it can be seen as the automated equivalent of the biological visual cortex .
A system using VCA can recognize changes in the environment and even identify and compare objects in the database using size, speed, and sometimes colour. The camera's actions can be programmed based on what it is "seeing". For example; an alarm can be issued if an object has moved in a certain area, or if a painting is missing from a wall, or if a smoke or fire is detected, or if running people are detected, or if fallen people are detected and if someone has spray painted the lens, as well as video loss, lens cover, defocus and other so called camera tampering events.
VCA analytics can also be used to detect unusual patterns in an environment. The system can be set to detect anomalies in a crowd, for instance a person moving in the opposite direction in airports where passengers are only supposed to walk in one direction out of a plane or in a subway where people are not supposed to exit through the entrances.
VCA can track people on a map by calculating their position from the images. It is then possible to link many cameras and track a person through an entire building or area. This can allow a person to be followed without having to analyze many hours of film. Currently the cameras have difficulty identifying individuals from video alone, but if connected to a key-card system, identities can be established and displayed as a tag over their heads on the video.
There is also a significant difference in where the VCA technology is placed, either the data is being processed within the cameras (on the edge) or by a centralized server. Both technologies have their pros and cons.
FACIAL RECOGNITION SYSTEM Is a computer application for automatically identifying or verifying a person from a digital image or a video frame from a video source. One of the ways to do this is by comparing selected facial features from the image and a facial database .
The combination of CCTV and facial recognition has been tried as a form of mass surveillance , but has been ineffective because of the low discriminating power of facial recognition technology and the very high number of false positives generated. This type of system has been proposed to compare faces at airports and seaports with those of suspected terrorists or other undesirable entrants. CCTV surveillance camera with IP audio PA horn watching from a high steel pole
Computerized monitoring of CCTV images is under development, so that a human CCTV operator does not have to endlessly look at all the screens, allowing an operator to observe many more CCTV cameras. These systems do not observe people directly. Insta Types of body-movement behavior, or particular types of clothing or baggage.
To many, the development of CCTV in public areas, linked to computer databases of people's pictures and identity, presents a serious breach of civil liberties . Conservative critics fear the possibility that one would no longer have anonymity in public places . Demonstrations or assemblies in public places could be affected as the state would be able to collate lists of those leading them, taking part, or even just talking with protesters in the street.
Comparatively harmless are people counter systems. They use CCTV equipment as front end eyes of devices which perform shape recognition technology in order to identify objects as human beings and count people passing pre-defined areas.
RETENTION, STORAGE AND PRESERVATION
Most CCTV systems may record and store digital video and images to a digital video recorder (DVR) or, in the case of IP cameras, directly to a server, either on-site or offsite.
There is a cost in the retention of the images produced by CCTV systems. The amount and quality of data stored on storage media is subject to compression ratios, images stored per second, image size and is effected by the retention period of the videos or images. DVRs store images in a variety of proprietary file formats . Recordings may be retained for a preset amount of time and then automatically archived, overwritten or deleted, the period being determined by the organisation that generated them.
CLOSED-CIRCUIT DIGITAL PHOTOGRAPHY (CCDP)
See also: Closed-circuit television camera
Closed-circuit digital photography (CCDP) is more suited for capturing and saving recorded high-resolution photographs, whereas closed-circuit television (CCTV) is more suitable for live-monitoring purposes.
However, an important feature of some CCTV systems is the ability to take high resolution images of the camera scene, e.g. on a time lapse or motion-detection basis. Images taken with a digital still camera often have higher resolution than those taken with some video cameras. Increasingly, low-cost high-resolution digital still cameras can also be used for CCTV purposes.
Images may be monitored remotely when the computer is connected to a network.
A growing branch in CCTV is internet protocol cameras (IP cameras). It is estimated that 2014 was the first year that IP cameras outsold analog cameras. IP cameras use the Internet Protocol (IP) used by most Local Area Networks (LANs) to transmit video across data networks in digital form. IP can optionally be transmitted across the public internet, allowing users to view their cameras through any internet connection available through a computer or a phone, this is considered remote access. For professional or public infrastructure security applications, IP video is restricted to within a private network or VPN , or can be recorded onto a remote server.
NETWORKING CCTV CAMERAS
The city of
The system is used by Chicago's Office of Emergency Management in case of an emergency call: it detects the caller's location and instantly displays the real-time video feed of the nearest security camera to the operator, not requiring any user intervention. While the system is far too vast to allow complete real-time monitoring, it stores the video data for later usage in order to provide possible evidence in criminal cases.
New York City
The Glynn County
An integrated systems unit.
Integrated systems allow different security systems, like CCTV, access control, intruder alarms and intercoms to operate together. For example, when an intruder alarm is activated, CCTV cameras covering the intrusion area are recorded at a higher frame rate and transmitted to an Alarm Receiving Centre.
WIRELESS SECURITY CAMERAS
Main article: Wireless security camera Wireless security camera
Many consumers are turning to wireless security cameras for home surveillance. Wireless cameras do not require a video cable for video/audio transmission, simply a cable for power. Wireless cameras are also easy and inexpensive to install, but lack the reliability of hard-wired cameras. Previous generations of wireless security cameras relied on analog technology; modern wireless cameras use digital technology which delivers crisper audio, sharper video, and a secure and interference-free signal.
Other towns have had such cameras installed. In 2007 several of the devices were installed in Bridlington town centre, East Riding of Yorkshire .
Due to the widespread implementation of surveillance cameras, glasses
are being built which can defeat CCTV cameras. In December 2016 a form
of anti-CCTV and facial recognition sunglasses called 'reflectacles'
were invented by a custom-spectacle-craftsmen based in
CCTV CAMERA VANDALISM
Unless physically protected, CCTV cameras have been found to be vulnerable against a variety of (mostly illegal) tactics:
* Some people will deliberately destroy cameras. Some cameras can come with dust-tight, pressurized, explosion proof , and bullet-resistant housings. * Spraying substances over the lens can make the image too blurry to view. * Lasers can blind or damage them. However, since most lasers are monochromatic, color filters can reduce the effect of laser pointers. However, filters will also impair image quality and overall light sensitivity of cameras (see laser safety article for details on issues with filters). Also, complete protection from lasers of any wavelength would require use of completely black filters, rendering the camera useless.
The security camera installation cost in
FACTORS AFFECTING SECURITY CAMERA INSTALLATION COST
Among other factors, the specific type of camera being used has the
most significant impact on its cost. The average cost of two digital
cameras packaged with an LCD monitor is around
The specific type of software that is being used also has a role to play on its price. On average, professional level software is offered at US$75, with some of them requiring annual fees for membership. Network attached storage or DVR , used for storing recorded video, will also be part of the cost. On average, that can cost about US$499. This will depend on the storage capacity and other features of the device chosen by the user.
Artificial intelligence for video surveillance
Closed-circuit television camera
Eye in the sky (camera)
Fake security camera
* ^ Another estimate put the number at about 100 million worldwide in 2011.
This article NEEDS ADDITIONAL CITATIONS FOR VERIFICATION . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed. (August 2013) (Learn how and when to remove this template message )
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