CCTV Video Camera - CCTV Digital Video Camera

CCTV is increased in the areas where increased need for security, such as a banks, airports and town center. CCTV was generally developed in banks for increased security but now after time in general video surveillance and home security it is also used. For residential applications, a CCTV digital video camera can protect your home and give you the peace of mind even when you are a way of knowing that things are secure. For commercial applications, nothing provides cost effective security and surveillance as well as documentation than a CCTV digital video recorder.

The primary work of a CCTV camera is to convert light into a video signal. All CCTV cameras require an optical lens to focus the light onto an image sensor located directly behind the lens inside the CCTV camera. The function of the lens is to limit and focus light at the image sensor of the CCTV camera. A lens can automatically control the amount of light who reaches the imaging sensor, are used in where the amount of light varies and varying weather.

CCTV was used in reference to video cameras that were each connected to a video recorder. Each camera has a video transmission cable, usually a coaxial type RG-59 cable, which runs from the camera to the recording unit and monitor. The only way to receive the camera’s signal was to be in a closed circuit with it via the video transmission cable. Since these cameras didn’t broadcast their video signals publicly, they were called Closed Circuit Television or CCTV.

On these units, the CCTV digital video unit is still connected to everyone camera in the system; however, as mentioned earlier they may now be connected by a specific radio signal transmission.

The DSP interprets the digital data sent to it by each digital video camera and then creates a digital video file. Unprocessed digital video files can become extremely large in a very short period of recording time, so the DSP usually applies some sort of Compression/Decompression or CODEC utility. This CODEC utility processed the digital data in such a way as to greatly reduce the size of the file while still maintaining high video quality.

In the security camera industry, a CCTV digital video recorder is usually thought of as one of three integral components in a digital video security system. The other two are the digital video camera(s) and an LCD monitor. For residential or commercial standalone digital video CCTV systems, the DVR is basically the equivalent of a personal computer hard disk drive connected to a high specialized type of computer processor called a Digital Signal Processor or DSP.

This standalone CCTV DVRs today normally have storage capacities that range from 250 gigabytes to over 1 Terabyte. This coupled with modern CODEC utilities this translates to longer periods between overwrites when a disk becomes full and even greater capacity to store multiple cameras at once.

Any CCTV camera installation process must determine the number of cameras required and must take into account the main fields of view and the recording needs. The other conditions to consider are the amount of lighting available, the areas that require live video monitoring, and the amount of time one needs to keep the video files.

You will have to choose Types of CCTV cameras depending on its usage, location of placement, and the time of the day during which it will be used. The Indoor Dome Cameras are used for inside applications, and are mounted on ceilings. These can be configured for day/night, standard color, or infrared. The common locations for Outdoor Dome Cameras are entry and exit points, with fewer amounts of night lighting. The Day/Night Cameras are useful in conditions of low light. In the daytime, these cameras records in standard color and then switch to low–lux black and white mode during the night.

Infrared cameras used in conditions where there is now available light. The camera does a black and white recording when the infrared LEDs get illuminated.

PTZ Cameras or “Pan – Tilt – Zoom” cameras can automatically zoom in all directions. These are mounted on such a stand that these can turn full 360 degrees in order to track the object in focus. These can also turn (or tilt) to an angle to the base for the same purpose.

Choosing the kind of CCTV [closed circuit TV] video camera is hard, but if you have a little knowledge of the problems than at least you know the kind of queries you ought to request. Conversing with a specialized sales representative may also be educating when they are in advance with the particulars. Selecting the most appropriate CCTV systems can be challenging. However, understanding the problems ought to allow it to be a simpler process.


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tags; CCTV video camera, CCTV digital video camera, CCTV camera, CCTV DVRs, digital video camera

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