ITU-R Recommendation BT.2020, more commonly known by the abbreviations Rec. 2020 or BT.2020, defines various aspects of UHDTV such as display resolution, frame rate, chroma subsampling, bit depth, and color space. It was posted on the International Telecommunication Union (ITU) website on August 23, 2012
Recommendation ITU-R BT.2020 (08/2012) Parameter values for ultra-high definition television systems for production and international programme exchange
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BT Series Broadcasting service television The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR)ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http://www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU‑T/ITU‑R/ISO/IEC and the ITU-R patent information database can also be found.
Parameter values for ultra-high definition television systems for production and international programme exchange
Scope Ultra-high definition television (UHDTV) will provide viewers with an enhanced visual experience primarily by having a wide field of view both horizontally and vertically with appropriate screen sizes relevant to usage at home and in public places. UHDTV applications require system parameters that go beyond the levels of HDTV. This Recommendation specifies UHDTV image system parameters for production and international programme exchange.
The ITU Radiocommunication Assembly, considering a) that digital terrestrial television broadcasting (DTTB) service has been introduced by some administrations since 1997 and can provide high quality television programmes through HDTV systems;
b) that viewers expect future TV systems beyond HDTV to provide improved characteristics compared with the current HDTV systems in terms of a more realistic sensation, greater transparency to the real world, and more accurate visual information;
c) that ultra-high definition television (UHDTV) is expected to become available in the near future with, inter alia, larger screens, higher spatial/temporal resolution, wider colour gamut, wider dynamic range, etc. taking into account developments of display technology;
d) that ITU‑R has been studying extremely high-resolution imagery (EHRI) and an expanded hierarchy of large screen digital imagery (LSDI) image formats and has established ITU‑R Recommendations: Recommendation ITU-R BT.1201-1 providing the guidelines of image characteristics for extremely high-resolution imagery, and Recommendation ITU-R BT.1769 offering the parameter values for an expanded hierarchy of LSDI image formats;
e) that LSDI is a system providing a display on a very large screen, typically for public viewing. This can be used in a wide variety of applications including programme presentations such as dramas, plays, sporting events, concerts, etc.;
f) that EHRI is a system offering higher resolution than HDTV and can be used for both broadcasting and non-broadcasting applications (e.g. computer graphics, printing and medical applications);
g) that UHDTV provides viewers with an enhanced visual experience primarily by a wider field of view that covers a considerable part of the human natural visual field with appropriate screen sizes relevant to usage at home and in public places;
h) that signal formats contributing to increasing the compression efficiency are desirable for UHDTV systems since they have a larger number of pixels than HDTV systems,
recommends
1 that for UHDTV programme production and international exchange, the specifications described in this Recommendation should be used[1], and further recommends
2 that if it is shown that an alternative electro-optical transfer function (EOTF) will provide significant benefits without also imposing significant disadvantages, then this Recommendation should be extended to enable use with an improved EOTF.
NOTE – Future consideration should be given to extend this Recommendation in a complementary manner to include extended image parameters.
TABLE 1
Picture spatial characteristics
TABLE 2
Picture temporal characteristics
TABLE 3
System colorimetry
TABLE 4 Signal format
TABLE 4 (end)
TABLE 5 Digital representation
TABLE 5 (end)
[1] Both 3840 × 2160 and 7680 × 4320 systems of UHDTV will find their main applications for the delivery of television programming to the home where they will provide viewers with an increased sense of “being there” and increased sense of realness by using displays with a screen diagonal of the order of 1.5 metres or more and for large screen (LSDI) presentations in theatres, halls and other venues such as sports venues or theme parks. Presentation on tablet displays with extremely high resolution will also be attractive for viewers. The 7680 × 4320 system will provide a more enhanced visual experience than the 3840 × 2160 system for a wider range of viewing environments. An increase in the efficiency of video source coding and/or in the capacity of transmission channels, compared to those currently in use, will likely be needed to deliver such programs by terrestrial or satellite broadcasting to the home. Research is under way to achieve this goal. The delivery of such programming will initially be possible by cable or fibre. [2] R'G'B' may be used for programme exchange when the best quality programme production is of primary importance. [3] Constant luminance Y'CC'BCC'RC may be used when the most accurate retention of luminance information is of primary importance or where there is an expectation of improved coding efficiency for delivery (see Report ITU-R BT.2246). [4] Conventional non-constant luminance Y'C'BC'R may be used when use of the same operational practices as those in SDTV and HDTV environments is of primary importance through a broadcasting chain (see Report ITU-R BT.2246).
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