720p

This chart shows the most common display resolutions, 720p being one of the 16:9 formats shown in blue.

720p (720 lines progressive) is a progressive HD signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9, normally known as widescreen HD (1.78:1). All major HD broadcasting standards (such as SMPTE 292M) include a 720p format, which has a resolution of 1280×720p.

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 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).

720i (720 lines interlaced) is an erroneous term found in numerous sources and publications. Typically, it is a typographical error in which the author is referring to the 720p HDTV format. However, in some cases it is incorrectly presented as an actual alternative format to 720p. No proposed or existing broadcast standard permits 720 interlaced lines in a video frame at any frame rate.

Comparison with interlace scanning

Progressive scanning reduces the need to prevent flicker by anti-aliasing single high contrast horizontal lines. It is also easier to perform high-quality 50<->60 Hz conversion and slow-motion clips with progressive video.

Resolutions

Standard Resolution Aspect ratio
HD 960×720p 4:3
HD 1280×720p 16:9
HD 720×1280p 9:16

Notes

  1. ^ It is, however, more commonly broadcast at (60/1.001), or precisely 59.940059, matching the NTSC SDTV field rate; this and the 50.00 Hz of PAL are still the second and third highest standard framerates.

See also

References

  1. ^ "720p – AfterDawn: Glossary of technology terms & acronyms".
  2. ^ Hoffner, Randy (2008-01-09). "Will the End of NTSC Be the End of 59.94?". TVTechnology. Retrieved 2010-10-08.
  3. ^ Briere, Daniel; Patrick Hurley (2006). HDTV for Dummies. For Dummies. p. 13. ISBN 9780470096734.
  4. ^ "ATSC Standard: Video System Characteristics of AVC in the ATSC Digital Television System" (PDF). 2008-07-29. Archived from the original (PDF) on 2012-10-04. Retrieved 2011-07-24.
  5. ^ "720p". AfterDawn. 2010-08-10. Retrieved 2010-10-08.
  6. ^ "720p". CNET Glossary. Archived from the original on 2010-09-30. Retrieved 2010-10-08.

External links

Digital video resolutions
Designation
Usage examples Definition (lines) Rate (Hz)
Interlaced (fields) Progressive (frames)
Low,
MP@LL
LDTV, VCD, HTV 240, 288 (SIF)   24, 30; 25
Standard,
MP@ML
SDTV, SVCD, DVD, DV 480 (NTSC), 576 (PAL/SECAM) 60; 50 24, 30; 25
Enhanced,
HMP@HML
EDTV 480, 540 (NTSC-HQ), 576 (PAL-HQ)   24, 30; 25
High,
MP@HL
HDTV, BD, HD DVD, HDV 720   24, 30, 60; 25, 50
1080, 1440 60; 50 24, 30, 60; 25, 50
Ultra-high
UHDTV, UHD BRD 2160, 4320   60, 120, 180
Broadcast video formats
Television
Analog
405 lines
525 lines
625 lines
819 lines
1125 lines
1250 lines
Audio
Hidden signals
Historical
Digital
Interlaced
Progressive
MPEG-2 Video
AVS
AVS+
MPEG-4 Visual
MPEG-4 AVC
AVS2
MPEG-H HEVC
Audio
Hidden signals
  1. ^ a b Also used in China's DVB-S/S2 network.
  2. ^ a b Defuncted.
Technical issues