1. What is CCTV?
CCTV (Closed Circuit Television) is a visual surveillance technology designed for monitoring a variety of environments and activities. CCTV systems typically involve a fixed (or "dedicated") communications link between cameras and monitors.
In the past decade, the use of CCTV has grown to unprecedented levels. In Britain between 150 and 300 million pounds (225 - 450 million dollars) per year is now spent on a surveillance industry involving an estimated 300,000 cameras Most British towns and cities are moving to CCTV surveillance of public areas, housing estates, car parks and public facilities. Growth in the market is estimated at fifteen to twenty per cent annually. 1
Many Central Business Districts in Britain are now covered by surveillance camera systems involving a linked system of cameras with full pan, tilt, zoom and infrared capacity. Their use on private property is also becoming popular. Increasingly, police and local councils are placing camera systems into housing estates and red light districts. Residents Associations are independently organizing their own surveillance initiatives. Tens of thousands of cameras operate in public places,; in phone booths, vending machines, buses, trains, taxis, alongside motorways and inside Automatic Teller (Cash) Machines.
The video surveillance boom is likely to extend even inside the home. Andrew May, Assistant Chief Constable of South Wales, has urged victims of domestic violence to conceal video cameras in their homes to collect evidence. The technology is already being used in hospitals to support covert surveillance of parents suspected of abusing their children.
The limits of CCTV are constantly extended. Originally installed to deter burglary, assault and car theft, in practice most camera systems have been used to combat 'anti-social behavior', including many such minor offenses as littering, urinating in public, traffic violations, obstruction, drunkenness, and evading meters in town parking lots. They have also been widely used to intervene in other 'undesirable' behavior such as underage smoking and a variety of public order transgressions. Other innovative uses are constantly being discovered. 2 When combined with observation of body language, the cameras are particularly effective in detecting people using marijuana and other substances. These systems are used increasingly to police public morals and public order. According to a glossy UK Home Office promotional booklet, "CCTV : Looking out for you", the technology can be a solution for such problems as vandalism, drug use, drunkenness, racial harassment, sexual harassment, loitering and disorderly behavior. 3
CCTV is very quickly becoming an integral part of crime control policy, social control theory and 'Community consciousness'. It is promoted by police and politicians as primary solution for urban dysfunction. It is no exaggeration to conclude that the technology has had more of an impact on the evolution of law enforcement policy than just about any technology initiative in the past two decades.
CCTV is a seductive technology. In a public policy domain which is notoriously rubbery, CCTV has a solid, "Sexy" and powerful image. It has become an icon for security and - for politicians - its promotion is guaranteed to create a feel-good response. When people are frightened of crime and criminals, critics of CCTV are often portrayed as enemies of the public interest.
While Britain is clearly the lead nation in implementing CCTV, other countries are quickly following. North America, Australia and some European countries are installing the cameras in urban environments which a few years ago would most likely have rejected the technology.
2. What sort of technology is used in CCTV systems?
The modern CCTV system involves a linked system of cameras with full pan, tilt, and zoom able to be operated remotely from a control room.
These systems may involve sophisticated technology. Features can include night vision, computer assisted operation, and motion detection facilities which allows the operator to instruct the system to go on red alert when anything moves in view of the cameras. Camera systems increasingly employ bullet-proof casing, and automated self defense mechanisms which - as with the Liverpool system - ensure that cameras under attack are covered by neighboring cameras These can be legitimately described as military style systems.
The clarity of the pictures is often excellent, with many systems being able to recognize a cigarette packet at a hundred metres. The systems can often work in pitch blackness, bringing images up to daylight level.
3. Can CCTV reduce crime?
Glowing reports of the effectiveness of CCTV are announced regularly. Strathclyde police in Scotland recently claimed a 75 per cent drop in crime following the installation of a £130,000 closed circuit TV system in Airdrie. Not only are people delighted because they are no longer afraid to go out shopping, say local police, but even criminals welcome the chance to prove their innocence by calling on evidence from the cameras. In King's Lynn, burglary and vandalism in the industrial estate has dropped to a tiny fraction of its original level. Crime in car parks has dropped by ninety per cent. People say they feel safer. Indeed they should. Assaults and other violent crimes appear also to have been decimated in the center of town.
The government believes this is because CCTV deters 'opportunistic' crime, where people take advantage of a situation on the spur of the moment. Phillip Edwards from the Home Office Crime Prevention Unit says the government is using CCTV as part of a long term plan to reduce overall crime. "Today's opportunist is tomorrow's professional criminal. If we decrease the number of opportunities for easy crime, we can reduce the number of people becoming professional criminals".
The logic, and the statistics, are superficially impressive, but some analysts are not convinced. In a report to the Scottish Office on the impact of CCTV, Jason Ditton, Director of the Scottish Centre for Criminology, argued that many claims of crime reduction are little more than fantasy. "All (evaluations and statistics) we have seen so far are wholly unreliable", The British Journal of Criminology went further by describing the statistics as "....post hoc shoestring efforts by the untrained and self interested practitioner ". 4
The crime reduction claims being made by CCTV proponents are not convincing. Three recent criminological reports (Home Office, Scottish Office and Southbank University) have discredited the conventional wisdom about the cameras effectiveness. In a report to the Scottish Office on the impact of CCTV, Jason Ditton, Director of the Scottish Centre for Criminology, argued that the claims of crime reduction are little more than fantasy. "All (evaluations and statistics) we have seen so far are wholly unreliable", The British Journal of Criminology described the statistics as "....post hoc shoestring efforts by the untrained and self interested practitioner." In short, the crime statistics are without credibility.
The crime statistics rarely, if ever, reflect the hypothesis that CCTV merely displaces criminal activity to areas outside the range of the cameras. One of the features of current surveillance practice is that the cameras are often installed in high-rent commercial areas. Crime may be merely pushed from high value commercial areas into low rent residential areas. Councils often find that it is impossible to resist demands for such systems. There is an additional element of displacement that should be of particularly concern to all communities. Since the growth of CCTV as the primary means of crime prevention, more traditional, community based measures have been discarded.
A Scottish Centre for Criminology report on CCTV in Airdre was unable to rule out displacement as a factor. 5 while various studies in other countries indicate that burglars and other criminals will travel long distances to commit crimes. 6 Discussing the justification for establishing a surveillance system of 16 cameras in Manchester, Gordon Conquest, chairman of the city centre sub committee of Manchester Council, candidly admitted "No crackdown on crime does more than displace it, and that's the best we can do at the moment." 7
The Crime Prevention Unit of the Home Office appears to agree. In 1993 it suppressed the findings of a survey on the crime impact of camera surveillance on the basis that the displacement effect had been all but ignored. In other words, crime may be merely pushed from high value commercial areas into low rent residential areas. One of the features of current surveillance practice is that the cameras are often installed in high-rent commercial areas. Councils often find that it is impossible to resist demands for such systems. The trend is fueled in part by the insurance industry, which in some towns is offering a thirty per cent reduction in premiums to local retailers who pay a contribution to a CCTV levy system. A nationwide insurance discount scheme is currently being negotiated, and should be in place by 1996.
Some police also concede that CCTV displaces crime. Richard Thomas, Acting Deputy Chief Constable for Gwent, recently told the BBC's Andrew Neil that he believed CCTV pushed some crime beyond the range of the cameras. 8 And in his interview with 20/20, Leslie Sharp said "Certainly the crime goes somewhere. I don't believe that just because you've got cameras in a city center that everyone says 'Oh well, we're going to give up crime and get a job".
The cameras are also creating a vastly increased rate of conviction after crimes are detected. Virtually everyone caught committing an offense on camera pleads guilty nowadays. Once people know they have been videotaped, they admit the offense immediately. Such is also the case in Newcastle, where the installation in 1992 of a 16 camera system has resulted in a 100 per cent incidence of guilty pleas. 9 Police are delighted at the time and money they are saving from long and expensive trials. Some legal experts are a little more wary of the implications of these results, arguing that - like DNA evidence - juries can be seduced and defendants intimidated in equal proportions by evidence that might not normally stand up to scrutiny. Indeed some districts are now reporting that people are surrendering after the mere mention in newspaper reports that their alleged activities had been captured on CCTV. 10
4. What does the public think of CCTV?
The picture is mixed. While proponents of CCTV are inclined to describe opposition to the technology as marginal, the reality is much less conclusive. In one survey commissioned by the UK Home Office a large proportion of respondents expressed concern about several key aspects of visual surveillance.
The extent of concern was highlighted by the outcome that more than fifty per cent of people felt neither government nor private security firms should be allowed to make decisions to allow the installation of CCTV in public places. 72 per cent agreed "these cameras could easily be abused and used by the wrong people". 39 per cent felt that people who are in control of these systems cold not be "completely trusted to use them only for the public good". 37 per cent felt that "in the future, cameras will be used by the government to control people". While this response could be interpreted a number of ways, it goes to the heart of the privacy and civil rights dilemma. More than one respondent in ten believed that CCTV cameras should be banned. 11
Another interesting conclusion of the Home Office survey was that 36 per cent of respondents did not agree with the proposition "the more of these cameras we have, the better". Contrast this with the view of Leslie Sharp, chief constable for the Scotland's Strathclyde Police Department. Referring to his forces mania for CCTV he told ABC news' 20/20 program "We will gradually drive the criminal further and further away, and eventually I hope to drive them into the sea". 12
The most crucial element of the Home Office survey was the conclusion that the public were less inclined to unconditionally support CCTV once issues were raised and discussed within groups.
FOOTNOTES
1. Davies, S (1996) Big Brother : Britain's web of surveillance and the new technological order, Pan Books, London, p. 183.
2. ibid p. 177.
3. CCTV, Looking out for you, Home Office, London, 1994 p 12.
4. cited in Davies, S (1996) Big Brother.
5. Ditton, J (1996) Does Closed Circuit Television Prevent Crime? Scottish Centre for Criminology, HSO Edinburgh.
6. Gabor, T (1978) "Crime displacement The literature and strategies for its investigation", Crime and Justice, Vol 6 no. 2 p.105.
7. City life, July 27 1994.
8. Andrew Neil Show, BBC TV, 29 May 1996.
9. ibid p. 11.
10. Dawson T, "Fraing the villains", New Statesman, 28 January 1994.
11. Honess T, and Charman E (1992) ; "Closed Circuit Television in public places" Crime Prevention Unit paper no. 35 London HMSO.
12. ABC News, 20/20, September 7, 1995.
CCTV systems
In the recent years, people are really concerned about theft as the burglars are increasing everyday and causing harm both to public places and your own home. With the introduction of CCTV systems criminal activities can be prevented to a great extent. The CCTV systems consist of some powerful video cameras, which are able to identify a trespasser and thus decrease crime rates considerably. Though previously this system was used only in public places but at present it is also used at homes to ensure residential security.
CCTV or Closed Circuit Television is an elegant system, which is created with the most updated technologies. CCTV systems are mainly used for surveillance by employing its point-to-point wireless links. These powerful security systems are widely used in important areas, which need special security such as banks, casinos, airports, shopping malls or military installations, army bases etc. CCTV systems were invented with a motto of observing the launch and take off of v2 rockets. In addition, the CCTV systems are also used to monitor the launch pad, before the launch.
Nowadays, the CCTV cameras are also installed outside government offices. The said systems have proved to be great for maintaining security in banks. As a matter of fact, CCTV systems are now holding a superior position amongst all other security systems. It is expected that the CCTV systems would potentially develop into the greatest security system ever invented. CCTV systems can be purchased very easily as the prices are stipulated according to your comfort.
Whether it is at your home or office, CCTV systems are just the best with an entire television network devoted for assured security. Unlike broadcast television, the different components of CCTV systems are hooked directly to each other through cables or direct wireless means. CCTV systems offer you with useful features like Multiple channel audio input, Pan/tilt/zoom, USB backup and Multiple channel video input. These features help you to observe several areas in your home at the same time.
While installing CCTV systems, it is important to maintain the prescribed laws. To be on the safe side, you can consult with your local law enforcement or a lawyer to ensure that local, state, and federal CCTV laws are strictly followed by you. CCTV systems would offer you with a complete protection both at home and outside.
Feel free to get in touch with Alarm Broker.
CCTV or Closed Circuit Television is an elegant system, which is created with the most updated technologies. CCTV systems are mainly used for surveillance by employing its point-to-point wireless links. These powerful security systems are widely used in important areas, which need special security such as banks, casinos, airports, shopping malls or military installations, army bases etc. CCTV systems were invented with a motto of observing the launch and take off of v2 rockets. In addition, the CCTV systems are also used to monitor the launch pad, before the launch.
Nowadays, the CCTV cameras are also installed outside government offices. The said systems have proved to be great for maintaining security in banks. As a matter of fact, CCTV systems are now holding a superior position amongst all other security systems. It is expected that the CCTV systems would potentially develop into the greatest security system ever invented. CCTV systems can be purchased very easily as the prices are stipulated according to your comfort.
Whether it is at your home or office, CCTV systems are just the best with an entire television network devoted for assured security. Unlike broadcast television, the different components of CCTV systems are hooked directly to each other through cables or direct wireless means. CCTV systems offer you with useful features like Multiple channel audio input, Pan/tilt/zoom, USB backup and Multiple channel video input. These features help you to observe several areas in your home at the same time.
While installing CCTV systems, it is important to maintain the prescribed laws. To be on the safe side, you can consult with your local law enforcement or a lawyer to ensure that local, state, and federal CCTV laws are strictly followed by you. CCTV systems would offer you with a complete protection both at home and outside.
Feel free to get in touch with Alarm Broker.
วันจันทร์, พฤศจิกายน 24, 2008
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CCTV: Closed Circuit Television
Closed Circuit Television (CCTV) is an installation of directly connected components creating a circuit which cannot be viewed by anybody outside of the circuit.
This is different to a terrestrial television broadcast system which anybody with an antenna and reception equipment can view.
Who needs a CCTV system?
CCTV systems can be found virtually everywhere in these days. They are no longer considered an expensive luxury item, especially when you consider your increased level of security.
CCTV systems can be found in both the private and commercial sector and are used for security/ crime prevention purposes and providing Health and Safety protection to the members of the general public.
You will have seen CCTV systems operating in town centres, football stadiums, high street shops, sports centres, petrol stations, on public transport - the list is endless.
A CCTV system is a proven method of increasing the level of security of your premises. Its visual appearance alone will deter a criminal from approaching or entering your property for fear of being captured and identified on the system.
CCTV solutions can be tailor made to suit individual requirements. They can be as simple as one camera and a monitor, but it is quite common to have multiple cameras/monitors and recording devices in one installation.
The Elements of a CCTV System
There are three basic elements to a CCTV system,
1. Camera 2. Lens 3. Monitor unit
The camera is the element which captures the image and transmits the picture back to a monitor. The camera needs a lens to be able to focus on the subject. There are a wide variety of lenses to suit different applications.
The monitor is the receiver unit which converts the captured image into a picture, allowing you to see it.
Colour or Monochrome?
This is a very common question, but ultimately only you can decide.
A CCTV system should be designed to suit your needs, to fit into the environment on your property. The installing company should provide guidance on the suitability of different options, features and benefits - including colour and monochrome units. It may be that you need a camera that will work in colour during the day and automatically switch to monochrome at night!
Recording
As circumstances don't normally permit the luxury of having a dedicated person to sit and watch a monitor 24 hours a day, the image captured by the camera needs to be recorded so that it can be viewed later, if necessary.
Traditionally, this was done with a time lapse Video Cassette Recorder (VCR) which worked on the same principle as a domestic video but with the ability to record for a much longer period of time.
However, the VCR has now been superseded by the digital Hard Disk Recorder (HDR). Rather than using tapes, the HDR stores the images on to a hard disk drive similar to the way a home computer stores data. More than one camera?! Most systems today comprise of more than one camera, but you don't; a monitor and recorder for each camera. Equipment is available that will split the monitor into four separate screens displaying four cameras, or a four way sequence unit can be used which allows you to choose which camera you would like to view. Alternatively, the automatic mode it will sequence through the four cameras that are connected. However, the most common way of controlling multiple cameras is via a multiplexer. To keep it simple, a multiplexer incorporates the above facilities but also has the ability to individually code mark each image from each camera and because of this, a multiplexer allows all of the cameras on a system to be recorded onto one tape or hard drive unit. The multiplexer then uses these code marks to play back the recorded picture from the camera that you wish to view. Historically multiplexers and recording units were separate pieces of equipment, but recently a number of manufactures have developed units that do both jobs.
I want......I need....... These days, a CCTV system can be designed to fit any scenario you care to imagine, using options from the vast range of equipment available from manufactures worldwide. For example, cameras can be internal, external, highly visible or covert. They can be static or fully controllable/movable from a remote location. You can have one camera or hundreds; you can record for one day or 21 days. With a suitable internet connection, you can even view your property when you are abroad. Get the picture??!!!
Quality Counts. Although an avid DIY-er can buy equipment that claims to be a CCTV system from their local store, and electrical companies have jumped onto the CCTV bandwagon and will install systems too, it is always advisable to seek the advice of a specialist company. Why? In around 70% of cases, CCTV footage is found to be inadmissible as evidence in a Court of Law because the quality of the evidence is considered inadequate. This can result from the poor design and bad installation of the system and highlights the importance to seek professional advice from the outset Only a specialist company who are professional in their approach and can demonstrate experience in design and installation should be approached. Most importantly, you must feel confident that the company you choose will listen to and understand your individual CCTV requirements. Their experience with lens optics and camera technology will guarantee you satisfaction with your system.
A specialist company will also ensure the best value for money, for example by using a different lens or camera mounting positions which can not only monitor the area at risk but also give an outline view of the surrounding area at the same time.
Data protection A CCTV system must be registered in order to comply with the data protection act of 1998. Since 24 October 2001, it has been a criminal offence to have an unregistered CCTV system that records people in a public or a private place (conditions apply). The Code of Practice contains legally enforceable 'Standards' that must be met to ensure compliance with the Data Protection Act 1998. There are also a further 30 points of good working practice which, when used in conjunction with the Standards, are designed to build and maintain public confidence in CCTV systems and to ensure that installers and users operate within the law. The Code of Practice is available for you to view at www.dataprotection.gov.uk.
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