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CCTV Bradfordkeepmemag2019-07-18T11:16:03+00:00

CCTV Bradford

Latest CCTV Reviews

Jenna Timmins

Mar 29, 2018

by Jenna Timmins on CCTV Installation Huddersfield

CCTV

Thank you Gary for fitting my 4 camera CCTV System

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Gary Pearce
9 York Road
Batley
West Yorkshire
WF170LG
01924505112
07860244274

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CCTV Frequently Asked Questions
1. What is CCTV? Why is there a need for CCTV?
CCTV is the abbreviation for Closed Circuit Television. It is a visual surveillance technology
system designed to monitor the desired surrounding environment and its activities. In recent
years, the role of CCTV has grown to unprecedented levels. Originally used to deter crime and
‘anti-social behavior’ such as minor offenses like littering, urinating in public and etc, CCTV now
plays a more important role, assisting the police and security organizations in their investigations.
Britain is currently the leading nation in implementing CCTV, most British towns and cities are
moving to CCTV surveillance in public areas, housing estates, car parks and public facilities.
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
In Singapore, an extensive round-the-clock CCTV surveillance system covers majority of the
highways and roads island wide, providing 24 hours visual surveillance on traffic situations. With
the system, authorities are able to response faster to traffic situations. In recent years, there is a
vast increase in demand for CCTV applications. Thousands of cameras are installed island wide.
They can be found in various places such as shopping malls, boutiques, bus terminals, MRT
stations, underpasses, Automatic Teller Machines ATM, sensitive government buildings, private
estates and even extending its application to red-light districts, in an attempt to monitor and deter
illegal activities.
CCTV is fast becoming an integral plan for crime control policies and social behaviour control
theory in an effort to maintain ethnical public behaviour and public order. It has become an icon
for security and its presence is guaranteed to generate a sense of security and welcomed by
many.
2. Can CCTV prevent crime?
CCTV acts as deterrence rather than prevention to crime. CCTV deters ‘opportunistic’ crime,
where people take advantage of a situation on the spur of the moment.
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.
3. Will the Camera’s work anywhere in the World?
The output of CCTV cameras is composite video. U.S, Japan and Canada uses NTSC system
whereas most Asia and European countries uses PAL system
4. What is NTSC and PAL system?
NTSC stands for National Television Standards Committee. It is the colour video signal television
standard: 525 lines, 60Hz
PAL stands for Phase Alternate Line. It is the colour video signal television standard: 625 lines,
50Hz
6. How to choose a suitable CCTV camera for your needs.
Choosing the correct CCTV Camera that fits your digital surveillance requirements is very
important. Below is a simplified set of guidelines when choosing the correct CCTV camera for
you application.
a) Location: Indoor or outdoor application
b) Requirement for day and night surveillance
c) The angle of view requirement. Wide angle coverage or a narrow field of view is
required.
d) Budget
7. How does focal length affect angle of view?
Focal length is measured in mm. A short focal length (e.g. 3.6mm) represents a wide angle of
view while a long focal length (16mm) represents a narrow angle of view.
8. What is Auto and Manual Iris?
Auto Iris lenses are lenses that are able to change the size of their iris in accordance to its
surrounding light condition. When the camera mechanism detect that there is insufficient light, the
lens will automatically enlarge its iris to accommodate more light in so it could focus properly and
produce images that are not too bright or too dark to see. It will do the reverse when it’s too bright.
For outdoor applications, where the light conditions are constantly changing, auto iris lenses are
needed.
For indoor applications, where light conditions are constant most of the time, a manual Iris lens
would be sufficient for the application. Manual iris lenses provide an effective solution for
applications where the surrounding environment and its lighting conditions are relatively stable. It
gives the best performance when used with cameras that are equipped with electronic shutters.
8. What is the difference between video driver and a DC driver in an auto iris lens?
Auto iris lenses need a driving circuit to control and operate a motor to adjust the aperture range
in accordance to varying light conditions. The driving circuit can be placed on either the camera
lens or inside the camera itself.
For video driver function, the control circuit is found on the camera lens. DC driver function
camera has the control circuit built-in in the camera itself.
Depending on the type of lens and camera you are using, you should always set it to the correct
setting in order for the auto iris function to operate correctly.

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