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GY/T 326-2019 English PDF

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GY/T 326-2019: Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of monitors
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Standard similar to GY/T 326-2019

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Basic data

Standard ID GY/T 326-2019 (GY/T326-2019)
Description (Translated English) Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of monitors
Sector / Industry Radio, Film & TV Industry Standard (Recommended)
Classification of Chinese Standard M61
Word Count Estimation 14,187
Date of Issue 2019-10-11
Date of Implementation 2019-10-11
Regulation (derived from) Broadcasting TV Bullitin (2019) No.86
Issuing agency(ies) State Administration of Radio and Television

GY/T 326-2019: Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of monitors


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(PLUGE test signal specification and calibration procedure for monitor brightness and contrast calibration) GY Radio and Television Industry Standards of the People's Republic of China Monitor brightness and contrast calibration using PLUGE test Signal specifications and calibration steps Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of monitors (ITU-R BT.814-4..2018, Specifications of PLUGE test signals and alignment procedures for setting of brightness and contrast of displays, MOD) 2019-10-11 released 2019-10-11 Implementation Published by the State Administration of Radio and Television

Contents

Foreword ... II 1 Scope ... 1 2 Normative references ... 1 3 Acronyms ... 1 4 PLUGE test signal specifications ... 1 4.1 Overview ... 1 4.2 Ultra HD and HD PLUGE test signals ... 2 4.3 SD PLUGE test signal ... 4 5 Monitor brightness and contrast calibration steps ... 6 5.1 HDR monitor ... 6 5.2 SDR Monitor ... 7 Appendix A (informative) Structural changes of this standard compared to ITU-R BT.814-4..2018 ... 8 Appendix B (informative) Gamma adjustment for HLG monitors in non-reference viewing environments ... 9 Appendix C (Informative) Black Level Control of PQ Monitor in Non-Reference Viewing Environment ... 10

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the redrafting method to modify the ITU-R BT.814-4..2018 "PLUGE test signal for display brightness and contrast calibration Specifications and Calibration Procedures. Compared with ITU-R BT.814-4..2018, this standard has more structural adjustments. Appendix A lists this standard and ITU-R BT.814-4. Cross-reference list of chapter number changes in.2018. The technical differences between this standard and ITU-R BT.814-4..2018 and their causes are as follows. -According to China's television system, content related to the 525-line television system has been deleted; -In order to enhance the operability of this standard, the first step is added to the monitor brightness and contrast calibration step, which clarifies that it should be based on The monitor monitors the image format, and inputs and displays the PLUGE test signal in the corresponding format. Please note that some elements of this document may involve patents. The issuer of this document is not responsible for identifying these patents. This standard is under the jurisdiction of the National Radio, Film and Television Standardization Technical Committee (SAC/TC 239). This standard was drafted. Radio and Television Planning Institute of the State Administration of Radio and Television. The main drafters of this standard. Wang Huiming, Ning Jinhui, Deng Xiangdong, Zhang Qian, Ou Zhenyan. PLUGE test signal specification and calibration procedure for monitor brightness and contrast calibration

1 Scope

This standard specifies the PLUGE test signal and calibration procedures for the calibration of brightness and contrast of monitors used in the broadcasting and television industry. This standard applies to the R & D, production, testing and operation of ultra-high-definition, high-definition and standard-definition monitors for the broadcast and television industry. Line maintenance.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB 3174-1995 PAL-D TV broadcasting technical specifications GB/T 14857-1993 Studio digital television coding parameter specification GY/T 155-2000 High-definition TV program production and exchange video parameter values GY/T 307-2017 Ultra high definition television system program production and exchange parameter values GY/T 315-2018 High dynamic range TV program production and exchange of image parameter values ITU-R BT.2022 General viewing conditions for subjective evaluation of standard definition television and high definition television images using flat panel displays (General viewing conditions for subjective assessment of quality of SDTV and HDTV television pictures on flat panel displays) ITU-R BT.2035 A reference viewing environment for the evaluation of high-definition television program materials and finished product programs environment for evaluation of HDTV program material or completed programmes)

3 Acronyms

The following abbreviations apply to this document. EOTF Electro-optical Transfer Function HDR High Dynamic Range HLG Hybrid Log-Gamma PLUGE Picture Line Up Generating Equipment PQ Perceptual Quantization SDR Standard Dynamic Range

4 PLUGE test signal specifications

4.1 Overview Monitor brightness and contrast calibration should use the PLUGE test signal. See the classification, image format and signal structure of PLUGE test signals Table 1. Table 1 PLUGE test signal classification, image format and signal structure No. PLUGE test signal classification image format signal structure 1 Ultra HD HDR PLUGE Complies with GY/T 315-2018 See 4.2 2 Ultra HD SDR PLUGE Complies with GY/T 307-2017 3 HD HDR PLUGE Complies with GY/T 315-2018 4 HD SDR PLUGE meets GY/T 155-2000 5 SD SLU PLUGE meets GB/T 14857-1993 See 4.3 4.2 Ultra HD and HD PLUGE test signals Figures 1 and 2 show the effective area and waveform diagrams of the Ultra HD and HD PLUGE test signals. Sample point numbers (horizontal) in Figures 1 and 2 See Table 2 for the rules and Table 3 and 4 for the row number (vertical) rules. See Table 5 and Table 6 for sample level specifications. Image of Ultra HD and HD PLUGE test signals The left side signal consists of two horizontal narrow bars, each group contains 10 narrow bars, each narrow The width of the bar is several scanning lines (10 lines for HD, 20 lines for 4K UHD, and 40 lines for 8K UHD). Narrow bar level on top The level above the black level is about 2%, and the level of the narrow bar in the lower part is about 2% below the black level. The signal on the right side of the image consists of two rectangles. On the upper side The rectangular level is about 2% higher than the black level, and the rectangular level in the lower part is about 2% lower than the black level. In the middle is a higher level window signal. Horizontal positive sampling point Black level Dim level Dim level Higher level Dim level Dim level Sampling point number Figure 1 Valid area of UHD and HD PLUGE test signals BT.0814-03 Higher level Slightly lighter levelSlightly lighter level Black level Slightly darker levelSlightly darker level Sa Sb Sc Sd Se Sf Sg Higher level Dim level Dim level Black level Figure 2 UHD and HD PLUGE test signal waveforms Table 2 Sampling point numbers (horizontal) corresponding to ultra-high-definition and high-definition PLUGE test signals Sampling point serial number (horizontal) HD 4K Ultra HD 8K Ultra HD Sa 0 0 0 Sb 312 624 1248 Sc 599 1199 2399 Sd 888 1776 3552 Se 1031 2063 4127 Sf 1320 2640 5280 Sg 1607 3215 6431 Sh 1919 3839 7679 Table 3 Line number corresponding to HD PLUGE test signal (vertical) Line number in GY/T 155-2000 HD (interlaced) HD (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, 890 654 Lh 388, 950 776 Li 398, 961 797 Lj 560, 1123 1121 Table 4 Line numbers corresponding to the Ultra HD PLUGE test signals (vertical) Line numbers in GY/T 307-2017 and GY/T 315-2018 4K UHD 8K UHD La 0 0 Lb 648 1296 Lc 690 1380 Ld 935 1871 Le 936 1872 Lf 1223 2447 Lg 1224 2448 Lh 1469 2939 Li 1511 3023 Lj 2159 4319 Table 5 Signal level samples corresponding to Ultra HD SDR and HD SDR PLUGE Figure 1 and Figure 2 Parameter Signal Level Sample (8bit) Signal Level Sample (10bit) Signal Level Sample (12bit) Higher level 235 940 3760 Black level 16 64 256 Light level 20 80 320 Dim level 12 48 192 Table 6 Signal level samples (narrow range) corresponding to Ultra HD HDR and HD HDR PLUGE Figure 1 and Figure 2 Parameter signal level samples (10bit) Signal level samples (12bit) Higher level 399 1596 Black level 64 256 Slight level 80 320 Dim level 48 192 Note 1. "Higher level" is 38.2% level for both PQ and HLG signals. When a PQ or HLG monitor with a peak brightness of 1000cd/m2 is used to display the signal level At the same time, the display brightness of both PQ and HLG is approximately 27cd/m2. Note 2. When an HLG monitor with a peak brightness of Lw is used to display "higher level", the corresponding display brightness value LH is calculated as shown in equation (1). )) 1000/lg (0.42 (1.20.048748 wwH LLL  ... (1) 4.3 SD PLUGE test signal SD PLUGE test signals are used in two applications. operational monitoring and subjective evaluation. In both cases, the signal structure is the same. However, the waveform amplitude is slightly different. The effective area and waveform of this signal are shown in Figure 3, and the signal level is shown in Table 7. The left side of the image of this signal consists of three adjacent narrow vertical bars. The middle vertical bar A is black, and the left vertical bar G is darker than the middle vertical bar. The right vertical bar H is brighter than the middle vertical bar. Taking into account the characteristics of the human eye, the brightness of the vertical bars is slightly different in different applications. See Table 7 for body level values. The right side of the image is a wide bar signal. The signal is divided into four areas, and the top area B is white level, which is large enough to be full. Sampling requirements for measuring instruments. The other three areas are decreasing gray levels. The background of the narrow vertical bars and wide bars is a uniform background. Has two different levels. -For operating monitoring occasions, the background level is set to the black level; -For subjective evaluation, the background level is set to the gray level shown in Table 7. The gray level is optimized for the monitor The subjective quality when displaying this signal is close to the quality when displaying a subjective evaluation image sequence. a) Effective area map b) Waveform graph Figure 3 SD PLUGE test signal valid area and waveform In Figure 3, the number of horizontal sampling points of the SD PLUGE test signal is less than the 720 sampling points specified in GB/T 14857-1993. It should be in the center of the digital valid line, and the error should be within ± 2 sampling points. Table 7 SD PLUGE test signal levels Parameter brightness signal level in Figure 3 Area number level name for operation monitoring occasions and subjective evaluation occasions A black level 0% 0mV (16) 64 B white level 100% 700mV (235) 940 C gray level 3 63.0% 441mV (154) 616 D Gray level 2 35.2% 246mV (93) 372 E gray level 1 15.1% 105mV (49) 196 F background level 0% 0mV (16) 64 70.3% 492mV (170) 680 G black bar level -1.8% -13mV (12) 48 -2.7% -19mV (10) 40 Intermediate level between G´ black bar level and background level 0% 0mV (16) 64 33.8% 237mV (90) 360 H gray bar level 1.8% 13mV (20) 80 2.7% 19mV (22) 88 H´ middle level between gray bar level and background level 0% 0mV (16) 64 36.5% 256mV (96) 384 Note 1. The 10-bit digital level value is the reference value, and other values can be derived by derivation. The 8-bit digital level value is in parentheses. Note 2. The representation of digital level is the same as GB/T 14857-1993. The expression of analog level is the same as GB 3174-1995. Note 3. For subjective evaluation, G´ and H´ are designed to avoid ringing caused by waveform jumps.

5 Monitor brightness and contrast calibration steps

5.1 HDR monitor The calibration of HDR monitor brightness and contrast has a strong dependence on viewing conditions. The viewing distance and ambient lighting conditions should conform to GY/T 315-2018 regulations. The steps for HDR monitor brightness and contrast calibration are as follows. a) Input and display the PLUGE test signal of the corresponding format according to the monitoring image format of the monitor, including Ultra HD HDR or HD HDR b) For HLG only, the monitor should be adjusted according to the target peak brightness in accordance with footnote e in GY/T 315-2018 Table 5 System gamma to adapt the display brightness to the viewing environment; c) For HLG1) only, the user black level boost control should be set to 0 first, and then the user gain control should be adjusted so that the screen center The higher level region has the nominal brightness value specified in Table 6; d) For HLG only, in a non-reference viewing environment, refer to footnote f in Table 5 of GY/T 315-2018 and Appendix B of this standard. One-step adjustment of the system's gamma value for compensation; e) For PQ and HLG, the user's black level boost control should be adjusted so that the horizontal bar on the screen that is about 2% below the black level just disappears. A horizontal bar about 2% above the black level is still visible. For non-reference viewing environments, refer to Appendix C for PQ monitors Perform user black level control. 5.2 SDR Monitor The calibration of the brightness and contrast of the SDR monitor has a strong dependence on viewing conditions. The viewing distance and ambient lighting conditions should conform to ITU-R BT.2022 and ITU-R BT.2035. The SDR monitor brightness and contrast calibration steps are as follows. a) Input and display the PLUGE test signal in the corresponding format according to the monitoring image format of the monitor, including Ultra HD SDR PLUGE, HD SDR PLUGE or SD PLUGE; b) Adjust the monitor's user gain control (traditional "contrast" control) so that the brightness corresponding to the peak white level on the screen Achieve the desired brightness; c) Adjust the monitor ’s user black level boost control (traditional “brightness” control) so that the screen is about 2% below the black level The horizontal bars just disappear, while horizontal bars about 2% above the black level are still visible. 1) For PQ images, the user gain control does not need to be adjusted, because the brightness of the monitor is determined by the PQ EOTF curve (the highest peak brightness that can be displayed is still Depends on the display capability of the monitor (rated maximum brightness)).

Appendix A

(Informative appendix) Structural changes of this standard compared with ITU-R BT.814-4..2018 Compared with ITU-R BT.814-4..2018, this standard has a lot of adjustments in structure. The comparison of specific chapter numbers is shown in Table A.1. Table A.1 Comparison of Article Numbers between this Standard and ITU-R BT.814-4..2018 Corresponding ITU Standard Article Number

1 Scope

- Key words -Think about it - Suggest -Further suggestions 2 - 3- 4- 4.1- 4.2 Annex 2 4.3 Annex 1 5- 5.1 Article 3 of Annex 3 5.2 Article 3 of Annex 3 Appendix A- Appendix B Annex 5 Appendix C Annex 4

Appendix B

(Informative appendix) Gamma adjustment of HLG monitor in non-reference viewing environment The footnote f of Table 5 in GY/T 315-2018 states that if the ambient light and ambient light are brighter, the system gamma value should be lowered to compensate the eye. Response status differences. In the non-reference environment, the adjustment method of the display gamma is shown in formula (B.1). ... (B.1) In the formula. γbright--Ambient brightness exceeds 5cd/m Monitor system gamma at 2 o'clock; γref-systematic gamma calculated according to footnote e of Table 5 in GY/T 315-2018; Lamb-ambient brightness in candela per square meter (cd/m 2). By adjusting the display's gamma to compensate for non-reference viewing environments, you can achieve more consistent results in a wide range of production environments.

Appendix C

(Informative appendix) Black level control of PQ monitor in non-reference viewing environment In a non-reference environment, in order to perform PQ PLUGE adjustment, E 'in PQ EOTF2) is available), 0max (bEa  instead. Therefore, EOTF The calculation is shown in equation (C.1).  ), 0max (EOTF bEaFD  ... (C.1) In the formula. FD-The brightness value of the linear component {RD, GD or BD} displayed after adjustment 3), the unit is candela per square meter (cd/m2); E´--represents a non-linear PQ color value {R´, G´ or B´}; b-variable for user black level boost control; a-attenuation factor 4). Applying this factor, after b is adjusted, it can still make FD maintain a constant brightness Lm when E´ = E´m. a The calculation is shown in equation (C.2).  mLba 1/EOTF1  ... (C.2) In the formula. Lm-The rated maximum brightness of the display. Note. E m´ refers to the E´ value corresponding to the rated maximum brightness of the display. The calculation of E m´ is shown in equation (C.3).  mm LE 1EOTF ' ... (C.3) 2) PQ EOTF has been specified in GY/T 315-2018. 3) In this standard, the brightness of a single color component (RD, GD or BD) is equivalent to the brightness value of a black and white signal when three color components are equal to this value. 4) If there is no attenuation factor compensation, an increase in b will increase the FD corresponding to all E´ values. This overall increase in brightness can result in brighter PQ monitors. Pixels in the degree range exceed their brightness range. Lm is the maximum rated brightness of the display. If the attenuation factor a is applied, even if b is adjusted, when E´ = E´m, FD can still maintain a constant Lm value.

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