Interior cameras : they are cameras that are installed inside the building
PTZ cameras : these are mobile cameras that are controlled and moved according to the user's desire
Hidden cameras : they are hidden cameras and there is a difficulty in detecting them
Wireless cameras : they are cameras that work without wires
Office cameras : they are cameras that do not need a recording device and recording is done through a memory card
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The surveillance camera industry has been witnessing a tremendous development in recent years to keep pace with customer requirements and achieve security in the best possible and available ways. At the beginning of the emergence of surveillance cameras, they worked with the analog system, or as it is called(analog), and in it the image quality was measured by the TVL unit, short for ( Television line ). Cameras with a resolution ranging from 450 to 1200 TV were available on the market .And we can conclude from its name that it is of low quality ( low definition) and it needed Analog Devices similar to it to display and record the image received from the cameras.
After that, digital or (High definition) systems appeared on us, called HD for short, and the quality of their cameras is measured in megapixels, and currently there are qualities ranging from 1 to 10 megapixels. It is worth noting here that the more megapixels, does not necessarily mean that the camera has become of unparalleled quality. There are other factors that need to be taken into account, such as the diameter of the lens used, whether the camera used supports the WDR (White dynamic range) feature, which is white balance, night vision range, the lowest lux number is sufficient for the camera to work in color, and other characteristics.
Hd systems are divided into several types, such as HDCVI, which supports image transmission via coaxial cable to long distances .There is also the HDTVI type, which is the technology used by Hikvision in its products. There is also AHD (analog HD) technology, which is slightly cheaper than cvi .CVBS technology is also available, which is the closest to the image of analog cameras. And it should be taken into account when choosing a surveillance camera of a certain diameter that the more megapixels of the cameras and the higher their quality, the higher their price, and they need more storage space. To keep up with the rapid development of camera systems, manufacturers