HDR-TVに関するITU-R SG6会合結果



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資 料 HDR 作 3-3 HDR-TVに 関 する ITU-R SG6 会 合 (2016 年 1-2 月 )の 結 果 2016 年 2 月 29 日

概 要 勧 告 案 :HDRテレビの 番 組 制 作 及 び 国 際 番 組 交 換 用 の 映 像 パラメータ 空 間 解 像 度 :2K, 4K, 8K 時 間 解 像 度 :24~120Hz BT.2020 広 色 域 背 景 輝 度 :5cd/m 2 ピーク 輝 度 1000cd/m 2 以 上 黒 :0.005cd/m 2 以 下 伝 達 関 数 :HLGとPQの2 方 式 のOETF EOTF OOTFを 規 定 HLGのOETFはARIB STD-B67と 同 等 PQのEOTFはSMPTE ST 2084と 同 等 輝 度 色 差 信 号 : YʹCʹBCʹ R とIC T CP の2 通 り 非 低 輝 度 YʹCʹBCʹRはBT.2020と 同 等 定 輝 度 IC T C P は 新 規 定 デジタル 表 現 :narrow rangeとfull rangeの 整 数 表 現 及 び 浮 動 小 数 点 表 現 採 択 承 認 手 続 きに5ヶ 月 程 度 を 要 する 見 込 み レポート: 番 組 制 作 及 び 国 際 番 組 交 換 用 のHDRテレビ HDRテレビの 技 術 的 な 説 明 今 後 の 主 要 な 検 討 課 題 IC T C の 妥 当 性 P PQ 方 式 のOOTFの 妥 当 性 1000cd/m 2 超 のディスプレイ 輝 度 に 対 応 するHLGのシステムガンマ 2

OETF( 光 - 電 気 ) EOTF( 電 気 - 光 ), OOTF( 光 - 光 ) OETF, EOTF, OOTF HLG PQ 3

HLGとPQの 相 互 変 換 PQ HLG ディスプレイのピーク 輝 度 HLG PQ ディスプレイのピーク 輝 度 (Scene Lightを 介 した 変 換 も 可 能 ) 4

TABLE 1 映 像 の 空 間 時 間 特 性 映 像 形 状 16:9 画 素 数 ( 水 平 垂 直 ) サンプル 構 造 画 素 形 状 画 素 順 序 7 680 4 320 3 840 2 160 1 920 1 080 Orthogonal 1:1 (square pixels) Pixel ordering in each row is from left to right, and rows are ordered from top to bottom. フレーム 周 波 数 (Hz) 120, 120/1.001,100, 60, 60/1.001, 50, 30, 30/1.001, 25, 24, 24/1.001 走 査 Progressive 5

TABLE 2 カラリメトリ Optical spectrum (informative) Chromaticity coordinates (CIE, 1931) x y 赤 (R) monochromatic 630 nm 0.708 0.292 三 原 色 緑 (G) monochromatic 532 nm 0.170 0.797 青 (B) monochromatic 467 nm 0.131 0.046 D65 per 基 準 白 色 0.3127 0.3290 ISO 11664-2:2007 等 色 関 数 CIE 1931 6

TABLE 3 厳 密 な 観 視 の 場 合 の 基 準 観 視 条 件 背 景 周 囲 Neutral grey at D65 背 景 輝 度 5 cd/m 2 周 囲 輝 度 5 cd/m 2 照 明 視 距 離 Avoid light falling on the screen For 1920x1080 format: 3.2 picture heights For 3840x2160 format: 1.6 to 3.2 picture heights For 7680x4320 format: 0.8 to 3.2 picture heights ディスプレイピーク 輝 度 1 000 cd/m 2 黒 レベル 0.005 cd/m 2 7

TABLE 4 PQ 方 式 の 基 準 非 線 形 伝 達 関 数 PQ EOTFの 入 力 信 号 PQ EOTF Non-linear PQ encoded value. The EOTF maps the non-linear PQ signal into display light. F = EOTF[ E D ] =10000 Y 2 max [( E c 1),0] Y = 1 m where c c E 2 2 3 1 m 1 m1 Eʹ denotes a nonlinear colour value {R, G, B } or { L, M, S } in PQ space [0,1] F D is the luminance of a displayed linear component {R D, G D, B D } or Y D or I D, in cd/m 2. So that when R =G =B, the displayed pixel is achromatic. Y denotes the normalised linear colour value, in the range [0:1] m 1 = m 2 = c 1 = c 2 = c 3 = 8

TABLE 4( 続 き) PQ OOTFの 入 力 信 号 Scene linear light. The OOTF maps relative scene linear light to display linear light. F D = OOTF[E] = G 1886 [G 709 [E]] PQ OOTF where E = {Rs, Gs, Bs; Ys; or Is} is the signal determined by scene light and scaled by camera exposure E is a non-linear representation of E F D is the luminance of a displayed linear component (R D, G D, B D ; Y D ; or I D ) The values E, Rs, Gs, Bs, Ys, Is are in the range [0:1] F D = G 1886 [ G 709 [E]] = G 1886 E E = G 709 [E] = 1.099 (59.5208 E) 0.45 0.099 for 1 > E > 0.0003024 = 267.84 E for 0.0003024 E 0 FD = G E 2.4 1886 [E ] = 100 9

TABLE 4( 続 き) PQ OETFの 入 力 信 号 PQ OETF Scene linear light. The OETF maps relative scene linear light into the non-linear PQ signal value. where E = OETF[ E ] = EOTF [ [ ] OOTF E ]= EOTF [F D ] 1 1 c + c Y m1 1 1 2 EOTF [F ]= D m 1+ c Y 1 3 Y = FD 10000 E is the resulting non-linear signal (R,G,B ) in the range [0:1] m 2 F D, E, are as specified in the opto-optical transfer function m 1, m 2, c 1, c 2, c 3 are as specified in the electro-optical transfer function 10

TABLE 5 HLG 方 式 の 基 準 非 線 形 伝 達 関 数 HLG OETFの 入 力 信 号 HLG OETF Scene linear light. The OETF maps relative scene linear light into the non-linear signal value. where: E = OETF [ ] E 2 0 E 1 E = a ln(e b)+ c 1 < E E is the signal for each colour component {Rs, Gs, Bs} proportional to scene linear light and scaled by camera exposure, normalised to the range [0:12] 5b. E is the resulting non-linear signal {R, G, B } in the range [0:1]. a = 0.17883277, b = 0.28466892, c = 0.55991073 Note 5b: If E is normalised to the range [0:1] then the equivalent equation for the OETF is: 3E 0 E 1 12 E = OETF [ E] = a ln( E b) + c 1 12 < E where a= 0.17883277, b= 0.02372241, c= 1.00429347 11

TABLE 5( 続 き) HLG EOTFの 入 力 信 号 HLG EOTF Non-linear HLG encoded value. The EOTF maps the non-linear HLG signal into display light. 1 F D = OOTF [ E ] = OOTF[ OETF [ E ] Thus, γ 1 R D = αys R S + β γ 1 G = αy G + β D S S γ 1 D S S B = αy B + β where: R s, G s, B s are the scene linear light signals, E, for each colour component normalised in the range [0:12] 5c. 4E 0 E E = OETF [ E ] = exp (( E c)/ a)+ b 1 2 < E Y = 0.2627R + 0.6780 G + 0.0593B 2 1 1 2 S S S S α = (L W L )/12 γ B β = L B F D is the luminance of a displayed linear component {R D, G D, or B D }, in cd/m 2. Note 5c: If E is normalised to the range [0:1] then the equivalent equation for the E is: E = OETF where a, b, and c are as defined in Note 5b. 1 [ E ] = exp E 2 3 (( E c) / a) + b 0 E 1 2 < E 1 2 12

HLG EOTF( 続 き) TABLE 5( 続 き) Eʹ is the non-linear signal {R,G,B } as defined for the OETF. R D, G D, B D are the displayed light for each colour component 5d, in cd/m 2. The values of parameters a, b, and c are as defined for the OETF. The OOTF is defined below. γ = 1.2 at the nominal display peak luminance of 1000 cd/m 2. L W is nominal peak luminance of the display in cd/m 2. L B is the display luminance for black in cd/m 2. The nominal signal range of E, Rs, Gs, Bs, and Y S is [0:12]. 5g 5e, 5f The reference display shall not display values greater than E' = 1.0. Such values should be clipped to 1.0 prior to display 5h. Note 5d: This EOTF applies gamma to the luminance component of the signal, whereas some legacy displays may apply gamma separately to colour components. Such legacy displays approximate this reference OOTF. Note 5e: For displays with nominal peak luminance (LW) greate r than 1000 cd/m 2, or where the effective nominal peak luminance is reduced through the use of a contrast control, the system gamma value should be adjusted according to the formula below, and may be rounded to three significant digits: γ = 1.2 + 0.42 Log 10 (L W 1000) Note 5f: The system gamma value may be decreased for brighter background and surround conditions. Note 5g: When E is normalised to the range [0:1] then the equation for α is:α = (L W L B ) Note 5h: Values exceeding 1.0 should not be shown on reference displays. Values below 0.0 should not be clipped in reference displays (even though they represent negative light) to allow the black level of the signal (L B ) to be properly set using test signals known as PLUGE see Recommendation ITU-R BT.814. 13

TABLE 5( 続 き) HLG OOTFの 入 力 信 号 HLG OOTF Scene linear light. The OOTF maps relative scene linear light to display linear light. where: F = [ ] D OOTF E = αy γ 1 R D = αys R S + β γ 1 D S S γ 1 B D = αys B S + β G = αy G + β Y = 0.2627R + γ 1 S E + β 0.6780 G + 0.0593B s S S S F D is the luminance of a displayed linear component {R D, G D, or B D }, in cd/m 2. E is the signal for each colour component {Rs, Gs, Bs} proportional to scene linear light and scaled by camera exposure, normalised to the range [0:12]. Y S is the normalised linear scene luminance. α, β, and γ are as defined for the EOTF. 14

TABLE 6 非 定 輝 度 YʹCʹBCʹ 信 号 形 式 R PQ R, G, B {R, G, B }=EOTF -1 (F D ) where F D = {R D, G D, B D } HLG {R, G, B }=OETF(E) where E = {R S, G S, B S } 輝 度 信 号 色 差 信 号 Y' = 0.2627R' + 0.6780G' + 0.0593B' B' Y' C B = 1.8814 R' Y' C R = 1.4746 15

TABLE 7 定 輝 度 IC T C 信 号 形 式 P PQ HLG L, M, S 色 空 間 L = (1688R + 2146G + 262B) 4096 M = (683R + 2951G + 462B) 4096 S = ( 99R + 309G + 3688B) 4096 L, M, S {L, M, S }=EOTF -1 (F D ) where F D = {L D, M D, S D } {L, M, S }=OETF(E) where E = {L S, M S, S S } I I = 0.5L' + 0.5M ' 色 差 信 号 C T = (6610L' 13613M '+7003S') 4096 C P = (17933L' 17390M ' 543S') 4096 YʹCʹBCʹ R信 号 の 使 用 がdefault IC T C P 信 号 の 使 用 は 関 係 者 の 合 意 が 条 件 16

TABLE 8 信 号 サンプリング 信 号 サンプリング 構 造 R', G', B', Y', I R', G', B' or Y', C' B, C' R,, or I, C T, C P 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 or I samples. サンプリング 構 造 C' B, C' R, C T, C P 4:4:4 system 4:2:2 system 4:2:0 system Each has the same number of horizontal samples as the Y' or I component. Horizontally subsampled by a factor of two with respect to the Y' or I component. Horizontally and vertically subsampled by a factor of two with respect to the Y' or I component. 17

TABLE 9 10-bit 12-bit 整 数 表 現 信 号 R', G', B' or Y', C' B, C' R,, or I, C T, ビット 数 n = 10, 12 per component R, G, B, Y, I の 量 子 化 Narrow range Full range C' B, C' R, C T, C P の 量 子 化 量 子 化 レベル 10-bit coding 12-bit coding 10-bit coding 12-bit coding 黒 (R = G = B = Y = I = 0) DR', DG', DB', DY', DI C P 64 256 0 0 無 彩 色 (C B = C R = 0) DC' B, DC' R, DC T, DC P 512 2048 512 2048 Nominalピーク (R = G = B = Y = I = 1) 940 3760 1023 4092 DR', DG', DB', DY', DI Nominalピーク (C B = C R = ±0.5) 960 3840 1023 4092 DC' B, DC' R, DC T, DC P 4 through 16 through 0 through 0 through 映 像 データ 1019 4079 1023 4092 Narrow rangeの 使 用 がdefault Full rangeの 使 用 は 関 係 者 の 合 意 が 条 件 18

TABLE 10 浮 動 小 数 点 表 現 信 号 Linear R, G, B. 信 号 表 現 16-bit floating point per IEEE standard 754-2008. PQの 正 規 化 HLGの 正 規 化 A value of 1.0 for each of R, G, B yields 1.0 cd/m 2 on the reference display. A value of 1.0 represents nominal peak white of the signal. 19