1、 Recommendation ITU-R BT.814-3 (12/2017) Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of displays BT Series Broadcasting service (television) ii Rec. ITU-R BT.814-3 Foreword The role of the Radiocommunication Sector is to ensure the rational, e
2、quitable, 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 Radiocommunica
3、tion 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 Resolu
4、tion 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 da
5、tabase can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed
6、 service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems S
7、M Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2017 ITU 2017 All rights r
8、eserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.814-3 1 RECOMMENDATION ITU-R BT.814-3 Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of displays (1992-1994-2007-201
9、7) Scope This Recommendation defines test signals and alignment procedures for the adjustment of displays used for programme production and monitoring. The signal may be used to set displayed image values for standard definition television, high definition television and ultra high definition televi
10、sion including the PQ and HLG high dynamic range television systems. Keywords PLUGE, display adjustment, HDR, HDR-TV, brightness, contrast The ITU Radiocommunication Assembly, considering a) that precision picture monitors are used in a variety of applications including subjective laboratory testing
11、 and control room monitoring of operational systems; b) that variations in the set-up and adjustment of displays may lead to variations in displayed pictures; c) that special signals that assist with the set-up and adjustment of monitors have been developed and have been in operational use for many
12、years, recommends 1 that the PLUGE test signal (see Note 1) described in Annex 1 should be used for setting of displays used for subjective assessments, and for operational monitoring of systems described in Recommendations ITU-R BT.17001 and ITU-R BT.6012; 2 that the PLUGE test signal described in
13、Annex 2 should be used for setting of displays used for subjective assessments, and for operational monitoring of systems described in Recommendations ITU-R BT.7093, ITU-R BT.20204 and ITU-R BT.21005; 1 Recommendation ITU-R BT.1700 Characteristics of composite video signals for conventional analogue
14、 television systems. 2 Recommendation ITU-R BT.601 Studio encoding parameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios. 3 Recommendation ITU-R BT.709 Parameter values for the HDTV standards for production and international programme exchange. 4 Recommendation ITU-R B
15、T.2020 Parameter values for ultra-high definition television systems for production and international programme exchange. 5 Recommendation ITU-R BT.2100 Image parameter values for high dynamic range television for use in production and international programme exchange. 2 Rec. ITU-R BT.814-3 3 that t
16、he procedure to be followed for the use of the PLUGE test signal should be as described in Annex 3, further recommends that further studies on methods for black level adjustment of HDR displays be conducted and that informative Annexes 4 and 5 of this Recommendation be updated to reflect improved me
17、thods. NOTE 1 The acronym, PLUGE, was originally derived from “Picture Line Up Generating Equipment”. Annex 1 (Normative) Specifications of PLUGE signal for SDTV The PLUGE signal (see Fig. 1) is composed of: a) three closely spaced narrow vertical stripes on the left-hand side of the picture. The ce
18、ntral vertical stripe is at waveform black level. The left-hand stripe is slightly darker, and the right-hand stripe is slightly lighter than the central stripe; b) a broad bar signal located on the right-hand side of the picture. It is divided into four areas, one at white level and the other three
19、 at descending grey levels. This grey scale is in approximately equal steps, as seen by eye, over a contrast range of 30:1. The peak white area is sufficiently large to enable the peak luminance to be set by a measuring instrument; c) a uniform background surrounding the vertical stripes and the bro
20、ad bar described above. Two different levels for this background are specified according to the application: for operational monitoring the background level is set to signal black level; for subjective assessments the background level is set to the grey level shown in Table 1. This background level
21、has been optimized to give a picture display of subjective quality similar to that used in sequences used in subjective assessment. Rec. ITU-R BT.814-3 3 FIGURE 1 PLUGE active field and waveform To take account of the characteristics of the human eye, the luminance specified for the vertical stripes
22、 described in c) is slightly different for the two applications (see Table 1). To ensure that in analogue composite systems the colour decoder of a display is working in its colour mode, it is recommended that a standard colour burst is included in the analogue waveform. The horizontal sample count
23、is less than the 720 horizontal samples defined in Recommendation ITU-R BT.601. The PLUGE signal should be centred within the active line of digital and analogue systems 2 samples. 4 Rec. ITU-R BT.814-3 TABLE 1 Levels of waveform Operational monitoring Subjective assessment monitoring % Level mV dig
24、ital % Level mV digital 625-line 525-line 625-line 525-line A black level 0% 0 mV (16)64 0% 0 mV (16)64 7.5% 54 mV (16)64 0% 0 mV (16)64 0% 0 mV (16)64 7.5% 54 mV (16)64 B white level 100% 700 mV (235)940 100% 714 mV (235)940 100% 714 mV (235)940 100% 700 mV (235)940 100% 714 mV (235)940 100% 714 mV
25、 (235)940 C grey level 3 63.0% 441 mV (154)616 63.0% 450 mV (154)616 65.8% 470 mV (154)616 63.0% 441 mV (154)616 63.0% 450 mV (154)616 65.8% 470 mV (154)616 D grey level 2 35.2% 246 mV (93)372 35.2% 251 mV (93)372 40.0% 286 mV (93)372 35.2% 246 mV (93)372 35.2% 251 mV (93)372 40.0% 286 mV (93)372 E
26、grey level 1 15.1% 105 mV (49)196 15.1% 108 mV (49)196 21.4% 153 mV (49)196 15.1% 105 mV (49)196 15.1% 108 mV (49)196 21.4% 153 mV (49)196 F background level 0% 0 mV (16)64 0% 0 mV (16)64 7.5% 54 mV (16)64 70.3% 492 mV (170)680 70.3% 502 mV (170)680 72.5% 518 mV (170)680 G black stripe level 1.8% 13
27、 mV (12)48 1.8% 13 mV (12)48 5.8% 42 mV (12)48 2.7% 19 mV (10)40 2.7% 20 mV (10)40 5.0% 35 mV (10)40 mid-level between G black stripe and background levels NA NA NA 33.8% 237 mV (90)360 33.8% 237 mV (90)360 38.8% 277 mV (90)360 H grey stripe level 1.8% 13 mV (20)80 1.8% 13 mV (20)80 9.2% 66 mV (20)8
28、0 2.7% 19 mV (22)88 2.7% 20 mV (22)88 10.0% 72 mV (22)88 mid-level between H grey stripe and background levels NA NA NA 36.5% 256 mV (96)384 36.5% 256 mV (96)384 41.3% 295 mV (96)384 Note 1 The 10 bit digital levels are defined as the primary values, and the rest are derived. The 8 bit digital level
29、s are in parentheses. Note 2 Digital levels are expressed in the same way as described in Recommendation ITU-R BT.601. Note 3 For the subjective assessment monitoring waveform, mid-levels between stripes and background are introduced to avoid ringing due to the sharp transition of the waveform. Note
30、 4 NA: the mid-level is not applied, and the level for this area is the same as the background. Rec. ITU-R BT.814-3 5 Annex 2 (Normative) PLUGE for HDTV, UHDTV and HDR-TV systems6 A PLUGE signal for HDTV, UHDTV and HDR displays is shown in Figs 2 and 3. Corresponding sample numbers (horizontal) are
31、given in Table 4 and line numbers are given in Table 5 for HDTV SDR and HDR image formats and sample numbers (vertical) are given in Table 6 for UHDTV SDR and HDR image formats. Code values of signal levels are given in Table 2 for SDR and in Table 3 for HDR. The central Higher level patch is used t
32、o set the luminance level of the display by means of the user gain control. In the case of HDR, the code value of the central Higher level patch is identical for both PQ and HLG. This differs from that of the peak white luminance level of PLUGE signals for SDR. Two types of signal can be used to set
33、 the brightness of the black level of the display by means of the user black level lift control. The signal on the left-hand side of the picture consists of narrow horizontal stripes (a width of 10 scanning lines). The stripes extend from approximately 2% above the black level of the waveform to app
34、roximately 2% below the black level. The signal on the right-hand side of the picture consists of two coarse stripes (a width of 138 lines) one stripe is approximately 2% above black level the other is approximately 2% below black level. This signal is suitable for setting display values. TABLE 2 Co
35、de values for HDTV and UHDTV (SDR) Parameter values, Figs 2 and 3 for SDR 8-bit digital value 10-bit digital value 12-bit digital value Higher level 235 940 3 760 Black level 16 64 256 Slightly lighter level 20 80 320 Slightly darker level 12 48 192 6 Sample and line numbers are as represented in Re
36、commendation ITU-R BT.709 for HDTV and as in Recommendation ITU-R BT.2020 for UHDTV. 6 Rec. ITU-R BT.814-3 TABLE 3 Narrow range code values for HDR Parameter values, Figs. 2 and 3 for HDR 10-bit digital value 12-bit digital value Higher level1, 2 399 1 596 Black level 64 256 Slightly lighter level 8
37、0 320 Slightly darker level 48 192 NOTE 1 This level corresponds to 38.2% PQ and HLG and results in the same luminance for both PQ and HLG signals (approximately 27 cd/m2) when displayed on a PQ display or on an HLG display with peak luminance of 1 000 cd/m2 (a “1 000 cd/m2 display”). NOTE 2 Luminan
38、ce value LH of the Higher level for an HLG display of peak luminance Lw is derived using the HLG EOTF in Table 5 of Recommendation ITU-R BT.2100 in conjunction with the system gamma obtained in accordance with Note 5e of Recommendation ITU-R BT.2100, and may be calculated as follows: )1000/(l o g 0
39、. 4 2 ( 1 . 20 . 0 4 8 7 4 8 10 wwH LLL FIGURE 2 PLUGE signal for adjusting black level Rec. ITU-R BT.814-3 7 TABLE 4 Sample numbers (horizontal) for corresponding image formats Sample number (horizontal) HDTV 4K UHDTV 8K UHDTV Sa 0 0 0 Sb 312 624 1 248 Sc 599 1 199 2 399 Sd 888 1 776 3 552 Se 1 031
40、 2 063 4 127 Sf 1 320 2 640 5 280 Sg 1 607 3 215 6 431 Sh 1 919 3 839 7 679 TABLE 5 Line numbers for HDTV image formats Line number as per Rec. ITU-R BT.709 HDTV (interlaced) HDTV (progressive) La 21, 584 42 Lb 183, 746 366 Lc 194, 756 387 Ld 254, 817 509 Le 255, 818 510 Lf 326, 889 653 Lg 327, 890
41、654 Lh 388, 950 776 Li 398, 961 797 Lj 560, 1 123 1 121 TABLE 6 Sample numbers (vertical) for UHDTV image formats Sample number (vertical) as per Rec. ITU-R BT.2020 4K UHDTV 8K UHDTV La 0 0 Lb 648 1 296 Lc 690 1 380 Ld 935 1 871 Le 936 1 872 Lf 1 223 2 447 Lg 1 224 2 448 Lh 1 469 2 939 Li 1 511 3 02
42、3 Lj 2 159 4 319 8 Rec. ITU-R BT.814-3 FIGURE 3 Analogue waveform of the signal for adjusting black level Annex 3 (Normative) Procedure for use of PLUGE test signals 1 Standard Dynamic Range (SDR) Television The adjustments described below are very dependent on the viewing conditions and it is prefe
43、rable to conform to the conditions for viewing distance and ambient illumination contained in Recommendations ITU-R BT.2022 and ITU-R BT.2035: using a photometer, the user gain control (legacy “contrast” control) is adjusted such that the centre of the white area (100% video level) reaches the desir
44、ed luminance of the display; the user black level lift control (legacy “brightness” control) is adjusted such that the blackest stripe just disappears, whilst the brighter stripe remains visible. 2 High Dynamic Range (HDR) Television The adjustments described below must be conducted in the following
45、 order and are very dependent on the viewing conditions. It is preferable to conform to the conditions for the reference viewing environment contained in Recommendation ITU-R BT.2100: 1. in the case of HLG only, the displays system gamma control is adjusted in accordance with the target nominal peak
46、 luminance of the display, appropriate for the viewing environment, according to Note 5e of Recommendation ITU-R BT.2100; 2. for both PQ and HLG, using a photometer, the user gain control is adjusted such that the centre of the Higher level area has the nominal luminance value corresponding to code
47、value specified in Table 3; Rec. ITU-R BT.814-3 9 3. in the case of HLG only, a further adjustment to the system gamma can be made to compensate for non-reference viewing environments. See Note 5f of Recommendation ITU-R BT.2100 and Annex 5; 4. for both PQ and HLG, the user black level lift control
48、is adjusted such that the blackest stripe just disappears, whilst the brighter stripe remains visible. In a non-reference viewing environment, a black level control for a PQ display may be applied as described in Annex 4 with respect to the PQ EOTF specified in Recommendation ITU-R BT.2100. Annex 4
49、(Informative) Black level control for PQ displays To enable the PQ PLUGE adjustment, the signal E that is applied in the PQ EOTF7 is replaced by the signal ),0max( bEa : ),0m a x (E O T F bEaF D where: E denotes a non-linear PQ colour value R, G, B FD is the luminance of an adjusted displayed linear component RD, GD, BD in cd/m2 b is the variable for user black level lift control wLba 1/E O T F1 is a gain to maintain the display peak luminance Lw whilst b is changed. Lw is the display peak luminance, adjusted by th
