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Digital resolutionAs you saw before, after going through a DVR the image is converted to the digital format. When converted to this format another measurement unit is used to refer to the resolution of the camera. The term TV lines is not used for digital resolution because the number of pixels that is available in the image is used. Nomes such as CIF, 2CIF, 4CIF, VGA, SVGA, XVGA, HD, Full HD, Mega Pixel and 4K are used to refer to CCTV digital resolution. See in the picture below that there are several dots that form an image, they are the pixels and the higher the number of pixels, the higher the digital resolution. It is possible to have thousands of pixels in an image, in this example, we could have cameras that generate 0.3 to 8 million pixels, that's the reason the resolution is referred in Mega Pixels (MP). Here a video that explain in the details how the CCTV system works. |
