Standard-definition television is a
television system that uses a resolution that is not considered to be either
high-definition television or resolution below 720p format. The two common SDTV
signal types are 576i, with 576 interlaced lines of resolution, derived from
the European-developed PAL and SECAM systems, and 480i based on the American
National Television System Committee NTSC system. SDTV and high definition
television (HDTV) are the two categories of display formats for digital television
(DTV) transmissions, which are becoming the standard.
High-definition
video is video of higher resolution (higher than 720p) and quality than
standard-definition. While there is no standardized meaning for
high-definition, generally any video image with considerably more than 480
horizontal lines (North America) or 576 horizontal lines (Europe) is considered
high-definition. 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". Since different image quality and data bandwidth, making video
signal divide into High Definition Television (HDTV), Standard Definition
Television (SDTV), Low Definition Television (LDTV). Apparently, HDTV is the
highest standard, its resolution reaches approximate 35mm wide-screen film
level, it requires video and display equipment supports horizontal resolution
reaches above 1000 television lines, resolution reaches 1920x1080. On image
quality perspective, HD resolution is four times higher than traditional analog
television resolution, image clarity, color reproduction are superior than
traditional TV. Meanwhile, the 16:9 video aspect ratio brings a broader vision.
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.
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%.
4K
resolution, also called 4K, refers to a horizontal resolution in the order of
4,000 pixels and vertical resolution in the order of 2,000 pixels. Several 4K
resolutions exist in the fields of digital television and digital
cinematography. In the movie projection industry, Digital Cinema Initiatives
(DCI) is the dominant 4K standard. In television and consumer media, 4K UHD or
UHD-1 is the dominant 4K standard. By 2015, 4K television market share had
increased greatly as prices fell dramatically during 2014 and 2015. By 2025,
more than half of U.S. households are expected to have a 4K-capable TV (2160p),
which would be a much faster adoption rate than that of Full HD (1080p).
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Posted by -Tech4step
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Posted by -Tech4step
Watch related video on youtube-Video
https://youtu.be/pnVD0RmOVAc
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