To ensure constant visual control over a certain object, people use a video surveillance system. It consists of a camera and a recording device. This system is used in different ways. Some people need it to prevent theft, others to monitor personnel, and some generally use it to track someone.
Components of video surveillance
The DVR is the main device of such a system. It is connected to sensors, various control devices and cameras. The recording is saved to the hard disk, its capacity varies and can be expanded with additional media.
Getting it right A medium-sized hard drive is capable of recording images for up to 20 days. Recording can be done in different ways: by the presence of motion, full day or according to a special schedule.
An important component of a video surveillance system is a camera. The image on different cameras can be color or black and white. CCTV cameras can do their job both indoors and outdoors. Such cameras are not afraid of various weather conditions, even in the dark, they can record with IR illumination. It is important to purchase reliable and durable cameras in order not to face problems in the future (for example, at http://happy-comp.ru )
Camera views
Cameras are different in structure and properties. The most common type are cased IP cameras . They are stationary and only give an image of one area. Fortunately, the lens in such cameras is wide-angle and can be monitored over a wide area.
PTZ cameras are able to change their observation area in all directions. They are equipped with a rotary mechanism and built-in zoom, which helps them even scale the image.
Dome cameras also have a rotary device and allow you to display a panoramic image by rotating 180 degrees vertically and 360 degrees horizontally. They are indispensable for observing a large area.
If video surveillance is carried out in secret, then miniature cameras are the best option. They use a lens the size of a needle's eye. They can be installed in hidden places and due to their small size are completely invisible
Ensuring the work of video surveillance
In order for video surveillance not to stop working, it needs to receive electricity. Power is supplied to such systems using a special power supply unit. Cameras with wires are supplied with current through one wire, where both the signal and the image are fed. But for �
