A video camera is one of the most important elements of a video surveillance system. In order to correctly determine the purchase of a camera, you need to know its main parameters. What technical characteristics should you pay attention to when creating or choosing a video surveillance system?
Size of the matrix. There are the following formats: 1/3 inch (ca. 8 cm), 1/2 inch (ca. 5 cm), 2/3 inch (ca. 8 cm), and 1 inch (2.54 cm). The larger the format, the better the camera image. 1/3 inch (ca. 8 cm) is the most common format.
The second important parameter is light sensitivity. It is calculated by multiplying the illumination index, measured in Lux, by a given coefficient F. The resulting figure affects how high-quality the image will be in low light. The lower the result, the higher the camera’s light sensitivity. But if you do not want to get into the technical wilds and do calculations, you need to consult a specialist before buying or in the place where you are going to make a purchase.
Camera resolution — the higher the resolution, the clearer and clearer the image. For indoor cameras, the figure of 380 TV lines is sufficient. As a rule, this indicator should be higher for outdoor cameras. This applies to analog video cameras.
Depending on the installation location, video cameras are divided into two categories: internal and external (outdoor). When choosing external cameras, you should pay attention to such features as IR illumination (the possibility of video surveillance at night, in poor lighting), the camera body (cameras in an anti-vandal housing are characterized by the increased shock resistance and a more reliable mount), the operating temperature range.