What is the difference between 1080i and 1080p?

Answer 1

HDTV 1080i is an interlaced picture and 1080p is progressive. HDTV 1080p is the shorthand name for a category of video modes. The number 1080 represents 1,080 lines of vertical resolution[1], while the letter p stands for progressive scan or non-interlaced. 1080p is considered an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal (display) resolution of 1920 dots across and a frame resolution of 1920 × 1080 or exactly 2,073,600 pixels. The frame rate in hertz can be either implied by the context or specified after the letter p (such as 1080p30, meaning 30 frames per second). 1080p is sometimes referred to in marketing materials as "True High-Definition" or "Full High-Definition". Although 2K/4K digital cinema technology is commercially available, and ultra-high definition video is in the research phase, 1080p and 1080i are currently the highest-resolution formats widely used for broadcasting and consumer distribution of video content. 1080i (pronounced "ten eighty I") is shorthand name for a category of video modes. The number 1080 stands for 1080 lines of vertical resolution, while the letter i stands for interlaced or non-progressive scan. 1080i is considered to be an HDTV video mode. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920 × 1080 or about 2.07 million pixels. The frame rate in hertz can be either implied by the context or specified after the letter i. The two frame rates in common use are 25 and 30 Hz, with the former (1080i25) generally being used in traditional PAL and SECAM countries (Europe, Australia, much of Asia, Africa), the latter (1080i30) in traditional NTSC countries (e.g. United States, Canada and Japan). Both variants can be transported by both major digital television formats, ATSC and DVB. 1080i vs 1080p To compare 1080i and 1080p it is important to compare framerates. Due to interlacing 1080i has twice the frame-rate but half the resolution of a 1080p signal using the same bandwidth. This is especially useful in sport-shows and other shows with fast-moving action. However, on some flat screens that don't support interlacing, this instead becomes smeared or jarred artifacts. Current digital television broadcast systems and standards are not equipped for 1080p50/60 transmission. Also, the majority of consumer televisions offered for sale are currently not equipped to receive or decode a 1080p signal at any frequency. It is less bandwidth-intensive to broadcast a film at 1080p24 than 1080i30, since 20% less data would be transferred. In addition, when the source material is 24 frames per second, as are most films, it would be easy to convert a 1080p24 broadcast to an NTSC 1080i30 format using a 3:2 pulldown process (see telecine). Moreover, displaying a p24 broadcast on an i50 system (such as PAL) requires the speed of video and audio be increased by over 4% (to 25 frames per second). For movies the frames (25 or 30 per second) are segmented into two interlaced fields with equal time index (psf, progressive in or with segmented frames). The deinterlacer has to perform a simple weave only. This ensures compatibility with 1080i25/30 with only little less coding efficiency than 1080p25/30 and half the bandwidth requirement of 1080p50/60, but the SDTV problems of PAL speed-up and Telecine judder remain. 1080i is better

Answer 2

Both formats have a resolution of 1920 x 1080 pixels. The difference is in the way the picture is refreshed.
"i" stands for interlaced. The image is drawn one line at a time starting with all the odd numbered lines, 1, 3, 5 and so on to line1079. Then the image is completed by drawing all the even numbered lines from line 2 to line 1080. Each pass is known as a field and 1080i normally uses a field rate of 50Hz or 60Hz. A complete refresh is completed 25 or 30 times each second.

"p" stands for progressive scanning. In this case, the image is drawn during a single field. Lines are drawn consecutively starting with lines 1, 2, 3, through line 1079 and 1080. As each field is normally drawn 50 or 60 times each second so the image is fully refreshed 50 or 60 times each second. To display a 1080p image needs data at twice the rate of a 1080i image because lines are drawn at twice the rate.

Some comments about frame and field rates: In Europe, the field rate is 50Hz while in North America it is 60Hz, hence the two frequencies mentioned above. They are not the only frame and field rates however. Some other rates are used as well. For example, film is normally shot at 24 frames per second. It is quite possible to capture film to a 1080p format but at 24 frames per second. The full format is identified as 1080p 24. Based on the information above, you can see that the data rate for 1080p 24 will be less than 1080p 50 and less than 1080i 25.

Answer 3

720p and 1080i are both high definition television formats and both use the same data rate. The two different resolutions were adopted into the HD specifications and any HD television can display either of them.

1080i has 1080 lines in each picture which are refreshed 25 or 30 times each second. It displays the full image in two passes called fields. The first field displays all the odd numbered lines and the next displays all the even numbered lines. The field rate is of course twice the frame rate so there are 50 or 60 fields each second. The alternating field method is known as interlacing, hence the "i" in the format.

720p has, as the number suggests, 720 lines in the picture. The "p" stands for progressive scanning and the full picture is refreshed from top to bottom 50 or 60 times each second. There are no alternating fields with progressive scanning. Although the spatial resolution is lower, the picture is updated twice as fast. Therefore, the same amount of data is used for both formats. For those who are interested, HD raw data uses 1.483 Gigabits per second, compared to SD which uses 270 Megabits per second.

720p was included to allow broadcasters the option of using higher refresh rates for content such as sports. The fast movement typically seen in sports material is better captured with the faster refresh rate as the expense of a slightly lower resolution.

All HD televisions and recorders will handle either format without any user intervention. For viewers, it is a little academic as the television will simply display the format that the broadcaster delivers.

1080p is mentioned frequently. At present, broadcasters are not offering 1080p and it is not being used for live production. Because it is a progressive scan, it uses twice the data rate of 1080i and 720p. Current live production equipment rarely supports the format and transmission channels are not given the bandwidth too properly carry the format. It is currently limited to local sources such as games consoles, Bluray players and computer displays.

Answer 4

All flat panel HDTVs (i.e., plasma and LCD), as opposed to CRT tube sets, are inherently progressive in nature. For marketing reasons, however, some manufacturers promote 720p (p for progressive) HDTV as 1080i (i for interlaced), mainly to signal, I suppose, that it supports 1080i signal and to improve their sales. The so called '1080i HDTVs' take a 1080i signal and downconvert the picture to the 720p resolution. Additionally, they de-interlace the 1080i signal and display it in progressive scan mode but in 720p resolution. So, a 1080i TV set is in reality a 720p set, but many manufactures designated 720p sets as such as soon as 1080p sets came along. 1080p sets, on the other hand, take 1080i cable or satellite signal and only deinterlace it, creating a progressive scan, meaning the picture is painted from the top to the bottom line (there are 1080 such horizontal lines) in a single pass and this process happens 60 times per second (in the US). This means that same size HDTV sets designated as 720p and 1080i have identical native resolution of the display. Quality of the picture depends only in part from resolution, however, and according to some professionals the most important aspect of picture quality is contrast ratio, the second most important is color saturation, the third is color accuracy, and only the fourth is resolution.

Answer 5

Both 1080 line and 720 line picture formats are HD signals. 720p is a lower spatial resolution but a higher temporal resolution than 1080i broadcast signal. That means that the 1080 line image is refreshed at half the rate of the 720p signal.

720p is regarded as a better format for high speed movement, hence it has some popularity for some sports broadcasts although 1080i is by far the more common format for Broadcast Television.

Note that 1080p is not a format that is being broadcast at present and for the time being it is limited to local sources such as Bluray players and games consoles.

Answer 6

720p and 1080i are both HD television formats. They use the same data rate but 720p updates the image twice as fast as the 1080i format. 1080i has twice the number of pixels in each frame, hence the same data rate.

720i is not a recognized television format.

Answer 7

720p = 720 pixel of video quality

1080p = 1080 pixel of video quality

1080p image quality is better than 720p .

Answer 8

720P is HD.