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What determines video resolution?


The resolution of each camera is determined by the size of the image sensor. These sensors are classified by their number of megapixels (approximately one million pixels). 

For example, a 1080p security camera will typically use a 2mp image sensor (1920 x 1080 = 2 million pixels). 2K cameras are a little trickier. Since they are defined as having approximately 2000 horizontal pixels, 2K cameras can use either 3mp, 4mp, or 5mp image sensors. The video quality between a 3mp and 5mp image sensor is quite drastic though, even if they are both classified as 2K. Following suit, a 4K camera will have an 8mp image sensor at its core (3840 x 2160 = 8 million pixels).