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.
CCTV is fast becoming an integral plan for crime control policies and social behavior control theory in an effort to maintain ethnical public behavior 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.
DVR stands for Digital Video Recorder. A Security DVR is capable of taking the video from digital or analog cameras and recording it into a digital format on a hard drive. It can record high quality video, maintenance free, for weeks or even months. An ideal replacement for time lapse VCRs.
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.
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
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
IR is the abbreviation for Infrared. IR cameras have image sensors that are designed to sense And process infrared light emitted from IR LEDs. Similar to Day & Night cameras, IR cameras Turned to monochrome mode when illumination falls below a certain Lux. An IR camera differs From a Day & Night camera in which an IR camera is able to capture video images in absolute
Darkness with the help of infrared light source.
Camera housings are of various shape and sizes. Different housing comes with different UP Rating, from dust proof to all weather rating. This system is governed by a number of European And British standards
Protected against dust limited ingress
Protection against low pressure jets of water from all directions limited ingress permitted
Protection against high pressure water from all directions limited ingress permitted
All DVRs are different. There are various factors to consider when purchasing a DVR besides Price comparison. The basic and most important factors to consider are:
i) Number of cameras supported, i.e. number of video inputs
ii) Recording at how many frames per second (fps)
iii) Compression technology used
iv) Hard Disk space, number of hard disk it can support
v) Network connection / remote viewing capability
vi) Motion detection or scheduling recording functions
vii) Video backup means, by USB, CD, DVD or other means.
viii) Easy and comprehensive search capabilities
Frames per second (fps) relates to how many pictures the DVR can record in a second. Real time Recording is about 30 fps. To calculate the fps per camera, take the total fps that the system could Offer and divide it by the number of video inputs. For example, a 100 fps DVR with 4 video inputs Would give u 100/4, 25fps per camera.