CCTV Camera Suppliers & Dealers in Delhi IGI Airport, Aerocity, Gurgaon & Noida
1. What is CCTV ?
2. Which type of Security Camera should I use ?
3. Is it difficult to install CCTV ?
1. What is CCTV
Most people think that CCTV is a relatively new invention, but then again, many don’t even know what it is … so first things first, what exactly is Closed Circuit Television? Well the television bit is perhaps self explanatory; it’s simply about putting a picture onto a television screen, or ‘video monitor’ to give it its correct title. Incidentally, very basic video monitors are essentially televisions, but without the additional circuitry needed, to receive and decode the Radio Frequency signals, which are transmitted through the air.
The ‘Closed Circuit’ bit is actually quite straightforward. Let’s say for example, that you subscribe to Satellite TV. If you watch your favourite television programme, you and perhaps a few million others will be able to receive the transmitted signal through the dish and ‘set top box’. As anyone with a correctly tuned ‘Telly’ can access this signal, we can safely describe this type of arrangement as an ‘Open Circuit Television’ or ‘OCTV’ system.;If a signal is being linked from any source, whether it’s a DVD player, a camcorder, or a surveillance camera, directly to a display device such as a television, this is described as a ‘Closed Circuit’ simply because it is not available to anyone else.
So you can see that in the early days of developing video camera security systems, the pictures from the cameras were almost always sent to a monitor, or a video recorder, or indeed a sealed Control Room under ‘Closed Circuit’ conditions, hence the now widely accepted term “Closed Circuit Television”.
2. Which type of Security Camera should I use?
A security camera can come in many different styles including dome, bullet, infrared and c-mount. The security camera that will work best for your application will depend on several factors such as whether you will use the security cameras inside or out, during the day, nighttime, or both.
Bullet style security cameras are the most popular. They can be used inside or out. These security cameras come in black and white or color and come with all of the required mounting hardware. Some security camera casings are weather resistant and don’t require added external protection. Most security cameras have a fixed 6mm lens that allows you to see facial features out to about 30 feet and provides a 56 degree angle of view.
Resolution levels for black and white security cameras are about 400 lines, any higher and the benefits are minimal. For color cameras, the higher the resolution the better.
Infrared security cameras are also very popular as they allow an image to be seen in little or no lighting conditions. Most infrared security cameras are bullet style and can be used inside or out. The cameras have infrared lighting installed around the outer edge of the lens which allows the security camera to see in no light.
The advantage to c-mount security cameras is that the lens can be changed. You’ll want a special camera lens if you need to see further than 35 ft. The colour c-mount security camera allows you to change lenses on the camera giving you the ability to zoom into a particular area. Varifocal camera lenses allow you to adjust the focus from 5 to 50 mm. These lenses can be used inside only unless you put it in special housing for outdoor use.
Dome security cameras basically provide a different look. Everyone has seen these security cameras in businesses and stores. Because of its shape, its difficult to tell exactly where the camera is aiming unless you see it up close. Dome cameras are generally used inside buildings
The dome camera is obviously named for its dome shape. Everyone has seen these security cameras in businesses and stores. Because of its shape, its difficult to tell exactly where the camera is aiming unless you see it up close. Dome cameras are generally used inside buildings, although the armor domes can be used outside as well
Infra Red Cameras
An infrared security camera has infrared LED lighting installed around the outside of the lens of the camera. This lighting allows the camera to capture a good image in no light at all.
Infrared cameras are often called “Night Vision” cameras because they can ‘see’ at night.
Infrared security cameras will provide a colour picture while the light is good. When it gets dark, the camera will switch to infrared mode and illuminate it’s built-in infrared LEDs. In infrared mode the image is captured in black and white.
The term Bullet Camera comes from its resemblance to a rifle bullet. Generally long and tapered like a cylinder, it looks like an oversized ammo cartridge.
Used in closed circuit television applications, bullet cameras contain essentially the same electronic components as c-mount cameras but have been modified to fit in a weatherproof casing for outdoor use.
The advantage to a c-mount camera is that the lens can be changed. If you need to see further than 35 or 40 ft then you’ll need a c-mount camera with a special lens. C-Mount lenses are available from 4mm to 50mm. A 4mm lens provides facial detail and a 70 degree angle of view focused up to about 35 ft.