With the rapid development of CMOS technology, high-definition video monitoring is mainly to solve the problem that people can’t see the details clearly in the normal monitoring process. “HD” refers to “high resolution”. The definition of HD originated from the field of digital TV, which is the standard format of HDTV determined by the American Society of film and television engineers. The definition of TV is measured by the number of horizontal scanning lines. Its centralized HD division is as follows:
(1) 1080i/1080p format is a standard digital TV display mode, with 1125 vertical scanning lines, 1080 visible vertical scanning lines, 16:9, resolution of 1920 × 1080, interlace / 60Hz, and line frequency of 33.75khz.
(2) 720p format is a standard digital TV display mode, with 750 vertical scanning lines and 720 visible vertical scanning lines, 16:9, resolution of 1280 × 720, line by line / 60Hz, and line frequency of 45khz.