HD standards for megapixel cameras

The rapid development of high-definition video surveillance is mainly to solve the problem that people cannot see clearly the "details" during normal surveillance. "High definition" means "high resolution". The definition of high definition originated from the field of digital television. High definition television, also called "HDTV", is a high-definition television standard format determined by the American Society of Motion Picture and Television Engineers. The definition of TV is measured by the number of horizontal scanning lines. Its centralized high-definition division method is as follows:

(1) 1080i format is a standard digital TV display mode, 1125 vertical scanning lines, 1080 Visible vertical scanning lines, 16:9, resolution 1920×1080, interlaced/60Hz, line frequency 33.75KHz. (2) 720p format is a standard digital TV display mode, with 750 vertical scanning lines, 720 visible vertical scanning lines, 16:9, resolution of 1280×720, progressive/60Hz, and line frequency of 45KHz. (3) 1080p format is a standard digital TV display mode, 1125 vertical scanning lines, 1080 visible vertical scanning lines, 16:9, resolution of 1920×1080 progressive scanning, professional format.

HD TV refers to TV standards that support 1080i, 720p and 1080p.

In the security industry, traditional surveillance systems can reach up to standard definition. After digital encoding, they can generally reach a resolution of 4CIF or D1, which is about 440,000 pixels, and the resolution is between 300 and 500 TV lines. time; if IP surveillance using high-definition network cameras is to achieve a resolution of 800 TV lines, the resolution of the network camera must at least reach the standard of 1280x720, which is about more than 900,000 pixels; if a 2-megapixel network camera is used, it will reach To meet the requirements of ultra-high-definition images, a network camera with an aspect ratio of 16:9 has a corresponding resolution of 1920x1080, and a network camera with an aspect ratio of 4:3 has a corresponding resolution of 1600x1200. The security industry mostly borrows the high-definition classification standards from the television field, commonly known as "high definition" and "standard definition." Network cameras with resolutions up to 1080i and 720p have appeared in the security market. This is because the network provides a high guarantee for the transmission of high-definition videos. Of course, there are also analog cameras with high-definition transmission interfaces, such as box cameras or all-in-one cameras with Y/Pb/Pr and VGA interfaces.