720p is an acronym for 1920 × 1080i, which is not to be confused with 1920 × 720p. The 720p term is rarely used for 720 × 576i, which is used in some digital camcorders or digital television receivers. When applied to camcorders, 720p usually refers to the 1920 × 1080i footage output from the camcorder at 50 or 60 frames per second, which is not the same as the 1920 × 1080p resolution (0.96 megapixels) of the camcorder sensor. When applied to HDTVs, 720p usually refers to 720 × 576i, which is the native resolution of the HDTV and has a resolution of 1280 × 720 px (0.9 megapixels). The term is used specifically to indicate progressive scan format (as opposed to interlaced) with a native resolution of 1920 × 1080 (1.0 megapixels).
720p (1280×720) is a video format developed by Digital Video Broadcasting (DVB) for digital television broadcasting, and is used in the DVB formats ATSC and ISDB-T. It is similar to 720p, but it is interlaced and has a native resolution of 1280×720 (1.0 megapixels). The term is also used to describe the resolution of the camera used to shoot a video. Like 1080i, 720p can use either 50 or 60 frames per second to create video.
720p is used to describe an output resolution of 1280×720 pixels (1.0 megapixels), typically at a frame rate of 50 or 60 frames per second. 720p is also commonly used to refer to the resolution of the output of the video picture in a camcorder. 720p is not a specification for the resolution of the video picture in a camcorder. The term is used because of the name of the format and the fact that it is a progressive scan format, the same reason that 1080i is referred to as 1080i when discussing video formats.
The term 720i is rarely used today. The standard HD broadcast formats are 720p and 1080i. Although 720i is a common term in many publications, Roger Scruton , John A. Chirgwin , Roger Manvell and Damon Rye have argued that the term has been used incorrectly as a synonym for 720p, and that it should be replaced with the term HDTV.
The 1080 pixel format is also sometimes called 1080i, where i stands for interlaced (averaged). The 1080i format was developed by the HD-MAC group at the University of Southampton in the UK, and was used for example in the 2006 DVD release of The Lord of the Rings.
The number 720 stands for the 720 horizontal scan lines of image display resolution (also known as 720 pixels of vertical resolution). The p stands for progressive scan, i.e. non-interlaced. When broadcast at 60[note 1] frames per second, 720p features the highest temporal resolution possible under the ATSC and DVB standards. The term assumes a widescreen aspect ratio of 16:9, thus implying a resolution of 1280×720 px (0.9 megapixels).
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