Closed Circuit Television (CCTV) is a system where the circuit in which the video is transmitted is closed and all devices in this circuit are connected together. In the past, these signals would be transmitted by using a videocassette recorder, but these have been all but totally replaced by digital video recorder (DVR) systems that can first transfer data from analog to digital and then store far more video and back up data automatically.
What is CCTV?
Modern CCTV systems are better than older because many reasons. Modern CCTV displays can be color, high-resolution displays and can include the ability to zoom to see more details.
Why CCTV surveillance is important?
- Reduce Cost and Risk
- Prevent and Deter Crime
- Fool-Proof Coverage
- Keep Your Employees Honest
- Encourage Good Behavior
- Prevent Safety Incidents
Types of CCTV surveillance systems:
We have to types of surveillance system:
- DVR system
- NVR system
NVR is better than DVR but each of them have its usage depends on the conditions.
Comparison between DVR and NVR systems:
|Differences||DVR system||NVR system|
|The meaning||DVR stands for digital video recorder||NVR stands for network video recorder|
|Kinds of system||DVR is an electronic device||NVR is a software program|
|Kinds of data||DVR system received data in analog and converts it to digital||NVR system is a direct way to use data in digital without converter device|
|resolution||High resolution||Low resolution|
|Kinds of camera||Analog camera||IP camera|
|Usage||For small distance||For long distance|
Types of cameras:
We have indoors and outdoors cameras our between them depends on the conditions we will use the camera for.
- Box Camera
Can be used in Outdoor Environmental Housings or for Indoor mountings if aesthetics are not a concern
- Dome Camera
It is available in indoor or outdoor housings. Its advantages is that it is small.
- PTZ Camera
Pan, Tilt and Zoom features. its benefits we can use it for zooming and see in all directions
- Bullet Camera
Requires no separate housing or lens, Good for low-light situations
- Day/Night Camera
IR filter that is lifted as lighting levels decrease
- Thermal (FLIR) Camera
Uses heat sensing to distinguish objects and people