An HD analog camera is a special type of analog, or CCTV, security camera that can record surveillance video in 720p to 1080p high definition (HD). To incorporate new HD analog cameras into an existing CCTV system, you will need to use an HD DVR capable of handling the HD video files.
1080p Full HD security cameras produce images with the resolution of 1920*1080. They are suitable for the general-purpose video surveillance but sometimes may fail to figure out small details from a distance.
Also, the height of an image is used to symbolize the resolution and thus, you can say 1080p resolution when talking about an image with 2 million pixels. The most common resolution for home security camera in the market includes 2MP (1080p), 4MP (1440p), 5MP (1920p) and 8MP (4K/2160p).
For many, there will be little to no noticeable difference between 1080p—known as Full HD—and 720p—known as HD—. However, those who pay more attention will definitely notice that 1080p results in a smoother, clearer image, and that 1080p is clearer than 1080i.