CCTV Camera Surveillance Systems
Closed-circuit television (CCTV) is a video recording system in which all the elements, such as the camera and monitor, are directly
connected. This is unlike broadcast television, where any receiver that is correctly tuned can pick up the signal from the airwaves.
CCTV Camera Surveillance Systems
Analogue Cameras can record straight to a recorder which is able to record analogue signals as pictures. If the analogue signals are recorded to tape, then the tape must run at a very slow speed in order to operate continuously. This is because in order to allow a 3 hour tape to run for 24 hours, it must be set to run on a time lapse basis which is usually about 4 frames a second. In one second, the camera scene can change dramatically. A person for example can have walked a distance of 1 meter, and therefore if the distance is divided into 4 parts i.e. 4 frames or 'snapshots' in time, then each frame invariably looks like a blur, unless the subject keeps relatively still.
Analogue signals can also be converted into a digital signal to enable the recordings to be stored on a PC as digital recordings. In that case the analogue video camera must be plugged directly into a video capture card in the computer, and the card then converts the analogue signal to digital. These cards are relatively cheap, but inevitably the resulting digital signals are compressed 5:1 (MPEG compression) in order for the video recordings to be saved on a continuous basis.
Another way to store recordings on a non-analogue media is through the use of a digital video recorder (DVR). Such a device is similar in functionality to a PC with a capture card and appropriate video recording software. Unlike PCs, most DVRs designed for CCTV purposes are embedded devices that require less maintenance and simpler setup than a PC-based solution, for a medium to large number of analogue cameras. Some DVRs also allow digital broadcasting of the video signal, thus acting like a network camera. If a device does allow broadcasting of the video, but does not record it, then it's called a video server. These devices effectively turn any analogue camera (or any analogue video signal) into a network tv. The different types of cameras according to its functionality are:
- Indoor Dome Cameras.
- Indoor Full Body Cameras.
- Outdoor/indoor Dome Cameras with built in Infra red lights.
- Outdoor/indoor Vandal proof Dome Cameras with and without built in Infra red lights.
- Outdoor Full Body Cameras with and without built in Infra red lights.
- Outdoor/indoor wide dynamic range Dome Cameras.
Discover more about the systems we use:
Analog CCTV Systems
Though most of our attention these days is focused on the transition to IP video technology, it's important to note that analog CCTV solutions can still be highly effective for many surveillance applications, especially those on a budget.
Camera
DVRs
Megapixel Digital Systems
The higher the resolution, the more accurate the detail in the image. With the old analogue technology, a live image has no more than 0.4 megapixels and a recorded image generally 0.1 megapixels (CIF). One Digital camera with 3.1 megapixels, on the contrary, records around 30 times more detail. As a result, larger image areas with up to 360° surround views are possible (MOBOTIX) , thus reducing the number of cameras and therefore the costs. For example, four lanes of a gas station can be recorded with one Digital Megapixel camera instead of four conventional cameras.
Systems
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32/125 Highbury Rd, Burwood, 3125, Victoria, Australia 
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