What is the SD, HD, Full HD, Ultra HD
Time:2016-03-25
Over the past few years As the technology upgrading and the video surveillance is adopting HDTV monitor, we usually hear several resolution standards like SD, HD, Full HD, Ultra HD. Compared with traditional CCTV video surveillance system, the higher definition means more superior image quality. Now we are going to discuss that what‘s these abbreviations mean.
Ultra HD (Ultra High Definition)
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SD (Standard Definition)
The so-called SD, is the physical resolution below 720p (1280x720) format. Standard definition refers to full D1 (720x576), that is SMPTE 259M standard.
HD (High Definition)
The physical resolution higher than 720p called as High Definition (HD). 720p means the vertical resolution is 720 television lines with progressive scan. About HD standard, internationally recognized two criteria: video vertical resolution higher than 720p or 1080i; video aspect ratio is 16:9.
From video quality, we can easily know the difference between "HD" and "SD".
In video surveillance market, based on H.264 IP camera and network video recorder supports HD resolutions, typically reaches 720p, 1080p, even much higher resolution such as 3 megapixel, 5 megapixel based on H.264+.
Full HD (Full High Definition)
The so-called full HD, refers to the physical resolution up to 1920x1080 (including 1080i and 1080p), it is the abbreviation of interlace, 1080p picture quality is better than 1080i. Apparently, 1080p can ensure the high resolution, excellent image quality, it‘s widely used in high definition video surveillance systems.
Ultra HD (Ultra High Definition)
Ultra high definition also known as UHD/4K, this standard includes 4K UHD and 8K UHD. 4K UHD reaches approximate 8.29 megapixels resolution (3840x2160), while 8K UHD reaches approximate 33.18 megapixels (7680x4320). To provide smooth and low bit-rate video streaming, Ultra high definition devices adopt the latest H.265/HEVC compression format. Compared with H.264, the latest H.265 can improve compression efficiency, using its own technology to reduce lagging and block effects in motion scenes, maintain high image quality while reducing bit-rate 50%.
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