Super Hi-Vision Technology. Torkel Aa. Thoresen and Anders Prytz

Transcription

1 Super Hi-Vision Technology Torkel Aa. Thoresen and Anders Prytz

2 Agenda About us What is Super Hi-Vision ITU recommendation BT.2020 The human eye vision acuity Super Hi-Vision 22.2 Audio Super 2012

3 About us Torkel Aamodt Thoresen Chief Technologist, Broadcast Speaker / Paper at IBC2007, IBC2008, IBC2010 and several other conferences Member of the DVB steering Board Anders Prytz Test Engineer DVB Speaker at IBC2011 with the article Video Quality Assessment a practical approach awarded Best article by a young professional

4 Super Hi-Vision / Ultra High Definition / 8K Developed by NHK (Japan s NRK) Standardized by ITU and SMPTE BBC involved in the development First demonstration in NHK did the first HDTV demonstration in 1981 Up to 120Hz Frame rate Uncompressed video bitrate ~80 Gbps 22.2 Audio system Demonstrated during London 2012

5 Standard definition 720 x 576 pixels

6 High definition (HDTV) 1920 x 1080 pixels

7 Super Hi-Vision (UHDV) 4K = 3840 x 2160 pixels

8 Super Hi-Vision (UHDV) 8K = 7680 x 4320 pixels

9 ITU-R Recommendation BT.2020 (rec. 2020) Released August 23, 2012 Display resolution - 4K: K: Aspect ratio :16:9, square pixels Frame rate - 120, 60, 60/1.001, 50, 30, 30/1.001, 25, 24, 24/ p is not defined! - Only progressive scan Chroma subsampling

10 Color depth Parameters Quantization levels 10-bit coding Values 12-bit coding Black level DR', DG', DB', DY', DY' C Achromatic DC' B, DC' R, DC' BC, DC' RC Nominal Peak DR', DG', DB', DY', DY' C DC' B, DC' R, DC' BC, DC' RC and and Quantization level assignment Video data Timing reference 10-bit coding 4 through and bit coding 16 through and

11 Colorimetri Parameter Opto-electronic transfer characteristics before non-linear precorrection Primary colours and reference white (2) Chromaticity coordinates (CIE, 1931) Values Assumed linear (1) Red primary (R) Green primary (G) Blue primary (B) Reference white (D65) x y (1) Picture information can be linearly indicated by the tristimulus values of RGB in the range of 0-1. (2) The colorimetric values of the picture information can be determined based on the reference RGB primaries and the reference white.

12 Signal format Parameter Values R'G'B' Signal format Constant luminance Y C C BC C RC Non-constant luminance Y C B C R E 4.5E, E 0.45 ( 1), 0 E E 1 Non-linear transfer function where E is voltage normalized by the reference white level and proportional to the implicit light intensity that would be detected with a reference camera colour channel R, G, B; E' is the resulting non-linear signal. α = and β = for 10-bit system α = and β = for 12-bit system

13 Signal format Parameter Values Derivation of Y C and Y Y C R G B Y' R' G' B' Derivation of colour difference signals C C BC RC B' YC, B' YC, R' YC, R' YC, B' Y C 0 R' Y C B' YC R' Y 0 C C C B R B' Y' R' Y'

14 Digital representation Parameters Coded signal Sampling lattice R', G', B', Y', Y' C Values R', G', B' or Y', C' B, C' R or Y' C, C' BC, C' RC Orthogonal, line and picture repetitive co-sited Orthogonal, line and picture repetitive co-sited with each other. The first (top-left) sample is co-sited with the first Y samples. Sampling lattice C' B, C' R or C' BC, C' RC Coding format 4:4:4 system 4:2:2 system 4:2:0 system Each has the same number of horizontal samples as the Y' (Y' C ) component. Horizontally subsampled by a factor of two with respect to the Y' (Y' C ) component. 10 or 12 bits per component Horizontally and vertically subsampled by a factor of two with respect to the Y' (Y' C ) component. Quantization of R', G', B', Y', Y' C, C' B, C' R, C' BC, C' RC DR DG DB INT INT INT R G B n 8 n 8 n 8 DY ( DYC ) INT 219 Y (YC ) 16 DC ( DC ) INT 224 C (C DC B BC B BC ) R ( DC RC ) INT 224 CR(CRC ) 2 n n 8 n 8

15 The Human Eye Visual acuity Visual acuity is "the ability to distinguish fine detail It is often measured in cycles per degree (CPD), which measures an angular resolution, or how much an eye can differentiate one object from another in terms of visual angles Resolution in CPD can be measured by bar charts of different numbers of white/black stripe cycles - A pattern 1.75 cm wide at 1 m distance equals an angle of 1 degree - The number of white/black bar pairs on the pattern will be a measure of the cycles per degree of that pattern - The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye - The maximum theoretical resolution is 50 CPD (1.2 arcminute per line pair, or a 0.35 mm line pair) at 1 m

16 Resolution vs. screen size The maximum theoretical resolution is 50 CPD (1.2 arcminute per line pair, or a 0.35 mm line pair) at 1 m At 1 m viewing distance, the largest theoretical TV screen for 1080p is then less than 38 cm high 4K-screen: Less than 76 cm 1 meter 8K-screen: Less than 152 cm 1 meter Alternatively: 3 meter: Screen less than 114 cm high (NHK recommends 100 cm) 3 meter: Screen less than 228 cm high (NHK recommends 200 cm) 3 meter: Screen less than 456 cm high (NHK recommends 400 cm)

17 Super Hi-Vision viewing principle HDTV 4k Super Hi-Vision (8k) 7680 pixels 1080 pixels 1920 pixels 30deg 2160 pixels 3840 pixels 55 deg 4320 pixels 100 deg 3.0 x picture height 1,5 x picture height 0.75 x picture height Visual acuity=1.0=20/20 Standard viewing distance

18 Super Hi-Vision transmission bitrates HEVC under standardization for up to 120Hz Frame rate Bitrate calculation example with H.264 (MPEG-4 layer10): - Today: 1080i@25Hz = 10 Mbps p@50Hz = 10 Mbps (EBU tests have shown no or little bitrate increment from i25 to p50) - 4K@50Hz = 3*1080p@50Hz = 30Mbps (due to similarity in the picture) - 8K@50Hz = 3*4K@50Hz = 90Mbps HEVC can possibly reduce bitrate need with up to 50% - 8K@50Hz = 45 Mbps (in some years.) 120Hz will increase the rate again - 8K@120Hz = 1,4*8K@120Hz = 65 Mbps (due to similarity between frames) - Figure one service per transponder - Super Hi-Vision is not defined for 100Hz!

19 Super Hi-Vision camera

20 Super Hi-Vision equipment Hitachi SHV camera - weighs just 4kg, compared to 20kg for the models being used to film Olympic events, and 80kg for the original SHV camera, made in 2001 Panasonic 145 plasma display Sharp 85 LCD prototype screen JVC Projector Test transmissions could begin in Japan as early as 2016!

21 Equipment One of the only three SHV cameras in the world

22 Panasonic P2 Tower SHV setup Video: /60P Audio: 22.2ch 24bit Recording Media: 17 P2 cards X 2 slots Compression Scheme: AVC-Intra100 x16 File Format: MXF+XML (P2HD)

23 Panasonic P2 Tower SHV setup Video: /60P Audio: 22.2ch 24bit Recording Media: 17 P2 cards X 2 slots Compression Scheme: AVC-Intra100 x16 File Format: MXF+XML (P2HD)

24 22.2 audio system Upper layer: Nine speakers above ear level - Three front - Two side + one ceiling - Three back Middle layer: Ten speakers at ear level - Five front - Two side - Three back Lower layer: Five speakers below ear level NHK - Three front - Left and right subwoofer

25 Loudspeakers How? Multi-channel microphone NHK

26 Super London 2012 Test transmissions from Opening ceremony, Swimming, Bicycling (track), Athletics and others Transmitted to - UK, three sites (BBC London, National Media Museum in Bradford and BBC Glasgow) - USA, one site - Japan, three sites Encoded bitrate 280 Mbps (MPEG 4) Three cameras The only three cameras in the world 1 hour highlights each day

27 National Media Museum in Bradford

28 Screenshots

29 Screenshots

30 Screenshots

31 Screenshots

32 Screenshots

33 Questions?

34 34 00 Month 0000