High-definition video (HDTV Video or HD video) is video of higher resolution and quality than standard-definition. While there is no standardized meaning for high-definition, generally any video image with considerably more than 480 vertical scan lines (North America) or 576 vertical lines (Europe) is considered high-definition.[1]
480 scan lines is generally the minimum even though the majority of systems greatly pass that.
High definition, having a great or considerable extent or reach upward or vertically; lofty; tall:a high wall. High - WordReference English dictionary, questions, discussion and forums.
References[change | change source]
- ↑Lee, Jack (2005). Scalable Continuous Media Streaming Systems: Architecture, Design, Analysis and Implementation. John Wiley & Sons. p. 25. ISBN9780470857649.
Definition of high in the Definitions.net dictionary. Meaning of high. What does high mean? Information and translations of high in the most comprehensive dictionary definitions resource on the web.
High-definition television (HDTV) is a new televisionbroadcasting system which uses a higher resolution than a normal television. With HDTV, people can watch television in higher quality than old television, giving a more vivid and clear screen.
Most HDTV systems use digital signals with a 16:9 aspect ratio (width to height). This is different to SDTV (standard-definition television) which uses analog signals and a 4:3 aspect ratio.
HDTV picture resolution is at least twice that of SDTV, so it can present a more vivid screen than analog television or DVD. HDTV can control resolution efficiently.
Some videos on the website YouTube, a free video sharing website that lets people upload and view videos, are in HD.
English Definition Words
There are different standards. Common ones are:
- 2560×1440, progressive scan, requiring about 3,68 Megapixels per frame. This is known as 1440p or WQHD. It is a new standard, which is slowly replacing many 1080p-computer-monitors in the household (everyday use).
- 1920×1080, progressive scan, requiring about 2,07 MPixels per frame. This is known as 1080p or FullHD. It has been used very frequently for different types of screens in the past few years.
- 1920×1080, interlaced, 1.04 MPixel per field. This is known as 1080i.
- 1280×720, progressive, 0.92 MPixel per frame. This is known as 720p.
As a comparison, PAL plus is at 1024x576 pixels, and NTSC at 853x480 pixels.