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dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.7.4 luminanceMappingY - Luminance Mapping y values | This variable indicates the yi values of the luminance mapping curve. It shall be in the bounded range [0 to 1 − ] and in multiples of (1 ÷ 8 192). When luminanceMappingX[ 0 ] is greater than 0, an initial linear segment shall be inferred that maps input values ranging from 0 to luminanceMappingX[ 0 ], inclusive... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.8 Colour correction table | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.8.1 Introduction | The variables defined in this clause are piece-wise linear pivot points representative of colour correction curve, implemented by the look-up table lutCC. This look-up table is taken as one input of the reconstruction process. The variables specified in this clause are present when payloadMode is set to 1 (i.e. table-b... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.8.2 colourCorrectionNumVal - Number of Colour Correction Curve Points | This variable specifies the number of pivot points in the piece-wise linear colour correction curve. The value of colourCorrectionNumVal shall be in the bounded range [0 to 65]. |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.8.3 colourCorrectionX - Colour Correction x values | This variable indicates the xi values of the colour correction curve. It shall be in the bounded range [0 to 1] and in multiples of (1 ÷ 2 048). The value of colourCorrectionX[ i + 1 ] shall be greater than the value of colourCorrectionX[ i ], for i in the range of 0 to colourCorrectionNumVal - 2, inclusive. |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.8.4 colourCorrectionY - Colour Correction y values | This variable indicates the yi values of the colour correction curve. It shall be in the bounded range [0 to 0,125 − ] and in multiples of (1 ÷ 16 384). When colourCorrectionX[ 0 ] is greater than 0, an initial linear segment shall be inferred that maps input values ranging from 0 to colourCorrectionX[ 0 ], incl... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9 Gamut mapping variables | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.1 Introduction | This clause specifies the semantics of the metadata used for the gamut mapping process (and its inverse process) documented informatively in Annex D. The index c of an array of variables that are defined in this clause represents an indicator specified as follows: the index value c equal to 0 should correspond to the r... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.2 satMappingMode - Saturation mapping mode | This variable indicates the mode of chrominance (re)mapping (a.k.a. saturation expansion or compression) used by the gamut mapping process. The value of satMappingMode shall be in the bounded range of [0 to 2] and as defined in Table 17. ETSI ETSI TS 103 433-1 V1.4.1 (2021-08) 32 Table 17: Chroma (re)mapping (saturatio... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.3 satGlobal1SegRatio | This variable specifies the WCG and SCG chrominance coordinates of the first inflection point of the three piece-wise linear expansion or compression curve. This variable shall be invoked only when satMappingMode is equal to 1. The value of satGlobal1SegRatio shall be in the bounded range [0 to (7 ÷ 8)] and in multiple... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.4 satGlobal2SegRatioWCG | This variable specifies the WCG chrominance coordinates of the second inflection point of the three piece-wise linear expansion or compression curve. This variable shall be invoked only when satMappingMode is equal to 1. The value of satGlobal2SegRatioWCG shall be in the bounded range [(7 ÷ 64) to (56 ÷ 64)] and in mul... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.5 satGlobal2SegRatioSCG | This variable specifies the SCG chrominance coordinates of the second inflection point of the three piece-wise linear expansion or compression curve. This variable shall be invoked only when satMappingMode is equal to 1. The value of satGlobal2SegRatioSCG shall be in the bounded range [(7 ÷ 64) to (56 ÷ 64)] and in mul... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.6 sat1SegRatio | This array of six variables specifies the WCG and SCG chrominance coordinates of the first inflection point of the three piece-wise linear expansion or compression curve. This array shall be invoked only when satMappingMode is equal to 2. The value of sat1SegRatio[ c ] shall be in the bounded range [0 to (7 ÷ 8)] and i... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.7 sat2SegRatioWCG | This array of six variables specifies the WCG chrominance coordinates of the second inflection point of the three piece- wise linear expansion or compression curve. This array shall be invoked only when satMappingMode is equal to 2. The value of sat2SegRatioWCG[ c ] shall be in the bounded range [(7 ÷ 64) to (56 ÷ 64)]... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.8 sat2SegRatioSCG | This array of six variables specifies the SCG chrominance coordinates of the second inflection point of the three piece- wise linear expansion or compression curve. This array shall be invoked only when satMappingMode is equal to 2. The value of sat2SegRatioSCG[ c ] shall be in the bounded range [(7 ÷ 64) to (56 ÷ 64)]... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.9 lightnessMappingMode | This variable indicates the mode of lightness (re)mapping used by the gamut mapping process. The value of lightnessMappingMode shall be in the bounded range of [0 to 3] and as defined in Table 18. Table 18: Lightness (re)mapping mode Value of lightnessMappingMode Definition 0 Lightness (re)mapping disabled 1 Lightness ... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.10 lmWeightFactor | This array of six variables specifies the weight to be applied to each primary and secondary colour during the lightness (re)mappping process. This array shall be invoked only when lightnessMappingMode is equal to 3. The value of lmWeightFactor[ c ] shall be in the bounded range [(−1 ÷ 4) to (6 ÷ 4)] and in multiples o... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.11 croppingModeSCG | This variable indicates the cropping mode of the SCG used by the gamut mapping process (or its inverse process). The value of croppingModeSCG shall be in the bounded range of [0 to 3] and as defined in Table 19. Table 19: SCG cropping mode Value of croppingModeSCG Definition 0 SCG cropping disabled 1 SCG cropping appli... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.12 cmWeightFactor | This array of six variables specifies the weight to be applied to each primary and secondary colour during the SCG cropping process. This array shall be invoked only when croppingModeSCG is equal to 3. The value of cmWeightFactor[ c ] shall be in the bounded range [0 to (63 ÷ 64)] and in multiples of (9 ÷ 64). |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.13 cmCroppedLightnessMappingEnabledFlag | This flag indicates whether the lightness (re)mapping is applied on the cropped SCG or not. When cmCroppedLightnessMappingEnabledFlag is equal to 0, it indicates that the lightness (re)mapping is not applied on the cropped SCG. When cmCroppedLightnessMappingEnabledFlag is equal to 1, it indicates that the lightness (re... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.14 hueAdjMode | This variable indicates the mode of hue (re)mapping (a.k.a. hue adjustment) used by the gamut mapping process (or its inverse process). The value of hueAdjMode shall be in the bounded range of [0 to 3] and as defined in Table 20. Table 20: Hue (re)mapping (hue adjustment) mode Value of hueAdjMode Definition 0 Hue adjus... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.15 hueGlobalPreservationRatio | This variable indicates the global preservation percentage for the hue (re)mapping. This variable shall be invoked only when hueAdjMode is equal to 2. The value of hueGlobalPreservationRatio shall be in the bounded range [0 to (7 ÷ 8)] and in multiples of (1 ÷ 8). |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.16 huePreservationRatio | This array of six variables indicates the preservation ratio to be applied to each primary or secondary colour during the hue (re)mapping process. This array shall be invoked only when hueAdjMode is equal to 3. The value of huePreservationRatio[ c ] shall be in the bounded range [0 to (7 ÷ 8)] and in multiples of (1 ÷ ... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.17 hueAlignCorrectionPresentFlag | This flag indicates the presence of hue correction parameters for each primary and secondary colour. A value of hueAlignCorrectionPresentFlag equal to 0 indicates that the parameters are not present. A value of hueAlignCorrectionPresentFlag equal to 1 indicates that the parameters are present. This flag shall be invoke... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.18 hueAlignCorrection | This array of six indices indicates the hue correction angle associated to each primary or secondary colour during the hue (re)mapping process. This array shall be invoked only when hueAlignCorrectionPresentFlag is equal to 1 and hueAdjMode is greater than 0. The value of hueAlignCorrection[ c ] shall be in the integer... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.19 chromAdjPresentFlag | This variable indicates the presence of chrominance adjustment mapping parameters for each primary and secondary colour during the hue (re)mapping process. This flag shall be invoked only when hueAdjMode is greater than 0. A value of chromAdjPresentFlag equal to 0 indicates that the parameters are not present. A value ... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 6.3.9.20 chromAdjParam | This array of six indices indicates values for tuning the chrominance adjustment parameters associated to each primary or secondary colour during the hue (re)mapping process. This array shall be invoked only when chromAdjPresentFlag is equal to 1 and hueAdjMode is greater than 0. The value of chromAdjParam[ c ] shall b... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7 HDR signal reconstruction process | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.1 Input streams | The input stream is composed of a decoded SDR video stream and associated dynamic metadata that are combined to reconstruct an HDR video signal. The dynamic metadata can be conveyed thanks to two mutually exclusive modes: a parameter-based mode (payloadMode 0) and a table-based mode (payloadMode 1). Concerning ITU-T or... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2 Reconstruction process of the HDR stream | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.1 Introduction | This clause specifies the reconstruction process enabling the generation of an HDR picture from an SDR picture with associated dynamic metadata. This process is defined for full range SDR picture signal (as defined in SMPTE RP 2077 [i.6]). For SDR picture defined as narrow-range signal, an (unspecified) conversion to f... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.2 Selecting a reconstruction mode | Clause 7.2.3 describes the processing step to construct luminance mapping and colour correction tables that are used as inputs to the HDR stream reconstruction process. The HDR reconstruction process operates on look-up tables reconstructed from variables (payloadMode 0) specified in clauses 7.2.3.1 and 7.2.3.2 or deri... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3 Luminance mapping and colour correction tables construction | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1 Luminance mapping table construction from variables (payloadMode 0) | |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.1 Introduction | The luminance mapping table construction for payloadMode 0 derives a 1D look-up table lutMapY from the luminance mapping variables as described in clause 6.2.5. This process takes as inputs: • the HDR picture characteristics variable hdrDisplayMaxLuminance (clause 6.3.3.4); • the luminance mapping variables tmInputSign... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.2 Overview of the computation of lutMapY | The look-up table lutMapY[ Ypost1 ], for luma values Ypost1 = 0..( maxSampleVal - 1 ), implements an inverse tone mapping function. The inverse tone mapping process is shown in Figure 4. For any Ypost1 in 0..( maxSampleVal - 1 ), the lutMapY[ Ypost1 ] is derived by applying the following steps: • Ypost1 is converted vi... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.3 Block "To perceptual uniform signal" | This process takes as input: • the luma value Ypost1. The process generates as output: • the perceptual uniform value Ypus. In the first step, Ypost1, which is a Recommendation ITU-R BT.1886 [8] compatible luma signal, shall be taken to the power γ = 2,4 to yield the linear-light signal Y2, see equation (1). = ... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.4 Block "Adjustment curve" | This process takes as inputs: • the perceptual uniform value Ypus ; • the variables tmOutputFineTuningNumVal, tmOutputFineTuningX[ i ] and tmOutputFineTuningY[ i ], for i=0..( tmOutputFineTuningNumVal - 1 ) (clause 6.2.5). The process generates as output: • the corrected value Yft . In this block, the input signal Ypus... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.5 Block "Inverse tone mapping curve" | This process takes as inputs: • the corrected value Yft ; • the variables shadowGain, highlightGain, midToneWidthAdjFactor (clause 6.2.5); • the variable hdrDisplayMaxLuminance (clause 6.3.3.4). The process generates as output: • the inverse tone-mapped value, in linear-light domain, Yadj . In this block, the input sig... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.6 Block "Black/white level adaptation" | This process takes as inputs: • the inverse tone-mapped value, in linear-light domain, Yadj ; • the variables tmInputSignalBlackLevelOffset and tmInputSignalWhiteLevelOffset. The process generates as output: • the stretched value Ybw . In this block, the input signal Yadj shall be adapted by the black and white stretch... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.7 Block "Gain limiter" | This process takes as inputs: • the value Ybw from clause 7.2.3.1.6; • the value Ypus from clause 7.2.3.1.3; • the variable tmInputSignalBlackLevelOffset in the structure luminance_mapping_variables( ) of the reconstruction metadata (clause 6.2.5); • the variable hdrDisplayMaxLuminance in the structure hdr_characterist... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.8 Block "To linear signal" | This process takes as inputs: • the gain limited value Yglim; • the variable hdrDisplayMaxLuminance (clause 6.3.3.4). The process generates as output: • the linear-light value Yll. In this block the computation of the value Yll, the input signal Yglim shall be converted from the perceptually uniform domain to the linea... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.1.9 Block "Inverse EOTF" | This process takes as inputs: • the linear-light value Yll ; • the variables kCoefficient[ i ] (clause 6.2.2). ETSI ETSI TS 103 433-1 V1.4.1 (2021-08) 42 The process generates as output: • the value lutMapY[ Ypost1 ]. In this block, an inverse EOTF is applied to the value Yll in order to compute the value of lutMapY[ Y... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.3 Luminance mapping table retrieval (payloadMode 1) | This process derives, for payload mode 1, a 1D look-up table lutMapY from the luminance mapping variables specified in clause 6.2.7. This process takes as inputs: • the luminance mapping table variables luminanceMappingNumVal, luminanceMappingX[ i ] and luminanceMappingY[ i ]. The process generates as output: • the lum... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.3.4 Colour correction table retrieval (payloadMode 1) | The process derives, for payload mode 1, a 1D look-up table lutCC from the colour correction table as described in clause 6.2.8. This process takes as inputs: • the colour correction table variables colourCorrectionNumVal, colourCorrectionX[ i ] and colourCorrectionY[ i ]. The process generates as output: • the colour ... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.2.4 HDR picture reconstruction from look-up tables and SDR picture | The HDR reconstruction process generates the reconstructed HDR picture from the decoded SDR picture and the luminance mapping and colour correction tables. This process takes as inputs: • an SDR picture made of two-dimensional arrays SDRY, SDRCb, SDRCr of width picWidth and height picHeight, after applying on the decod... |
dfe3953e79c1e8a904893e451e909192 | 103 433-1 | 7.3 Piecewise linear function computation | A piecewise linear function f (x) is specified by a list of { xi, yi } pairs. f (x) shall be defined on the domain [0 to 1]. f (x) shall be computed as specified in this clause. The y = f (x) values that are not in the list of { xi, yi } pairs shall be obtained through interpolation. The default processing of y = f (x)... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 1 Scope | The present document specifies the SDR-to-HDR content-based dynamic metadata and the post-decoding process enabling reconstruction of an HDR signal from an SDR signal and the specified metadata. This reconstruction process is typically invoked in a Consumer Electronics device such as a TV set, a smartphone, a tablet, o... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 2 References | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3 Definitions, symbols, abbreviations and conventions | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: colour correction: adjustment of the luma and chroma components of a signal derived from the HDR signal in order to avoid hue shift and preserve the colour look of the HDR signal in the SDR signal colour volume: solid in colorimetric s... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.2 Symbols | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.2.1 Arithmetic operators | For the purposes of the present document, the following arithmetic operators apply: + Addition − Subtraction (as a two-argument operator) or negation (as a unary prefix operator) ETSI ETSI TS 103 433 V1.1.1 (2016-08) 11 × Multiplication, including matrix multiplication y x Exponentiation. Specifies x to the power of y.... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.2.2 Bit-wise operators | For the purposes of the present document, the following bit-wise operators are defined as follows: y x >> Arithmetic right shift of a two's complement integer representation of x by y binary digits. This function is defined only for non-negative integer values y. Bits shifted into the most significant bits (MSBs) as a ... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.2.3 Mathematical functions | For the purposes of the present document, the following mathematical functions apply: Abs( x ) ⎩ ⎨ ⎧ < − ≥ 0 , 0 , x x x x Clip3( x, y, z ) ⎪⎩ ⎪⎨ ⎧ > < otherwise , , , z y z y x z x Flab( x ) ⎪ ⎪ ⎩ ⎪⎪ ⎨ ⎧ ⎟⎠ ⎞ ⎜⎝ ⎛ ⎟⎠ ⎞ ⎜⎝ ⎛ ⎟⎠ ⎞ ⎜⎝ ⎛ ⎟⎠ ⎞ ⎜⎝ ⎛ ⎟⎠ ⎞ ⎜⎝ ⎛ ≤ + × > 3 29 6 29 4 2 6 29 3 3 29 6 , , 3 1 x x x x Floor( x ) th... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: AVC Advanced Video Coding CE Consumer Electronics CIE Commission Internationale de l’Eclairage CLVS Coded Layer-wise Video Sequence CRI Colour Remapping Information CVRI Colour Volume Reconstruction Information EOTF Electro-Optical Transfer Fu... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 3.4 Conventions | Unless otherwise stated, the following convention regarding the notation is used: • Variables specified in the present document are indicated by bold Arial font 9 points camel case style e.g. camelCase. All those variables are described in clause 6. • Internal variables of the present document are indicated by italic C... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 4 End-to-end system | Figure 1 shows an end-to-end workflow supporting content production and delivery to HDR and legacy SDR displays. This HDR provision workflow primary goal is to provide direct SDR backward compatible services i.e. services which associated streams are directly compatible with SDR Consumer Electronics devices. This workf... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 5 HDR system architecture | The block diagram in Figure 2 depicts in more detail the HDR decomposition and reconstruction processes. The centre block included in dash-red box corresponds to the distribution encoding and decoding stages (e.g. based on HEVC or AVC video coding specifications). The two left and right grey-coloured boxes respectively... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.1 Introduction | Clause 6 specifies the dynamic metadata format for SDR-to-HDR reconstruction. Clause 6.2 specifies the syntax of the reconstruction metadata using pseudocode. The pseudocode is based on C language, but is simplified for ease of understanding. When the number of bits used to represent a variable is not fixed and not bou... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2 Reconstruction metadata syntax | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.1 Introduction | This clause specifies the format of the dynamic metadata used for SDR-to-HDR reconstruction. This format supports two mutually exclusive carriage modes: parameter-based mode and table-based mode. Both SDR picture and reconstructed HDR picture characteristics are common to both modes. The SDR-to-HDR-reconstruction proce... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.2 HDR reconstruction information | The syntax of hdr_reconstruction_info( ) is specified in Table 1. Table 1: Syntax of hdr_reconstruction_info( ) Syntax No. of bits hdr_reconstruction_info( ) { specVersion payloadMode hdr_characteristics( ) sdr_characteristics( ) switch (payloadMode) { case 0: luminance_mapping_variables( ) colour_correction_adjustment... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.3 Reconstructed HDR picture characteristics | HDR picture characteristics (output HDR picture format and characteristics of the reconstruction process) are specified by syntax elements present in Table 2. From the IRD viewpoint, those variables can be mapped from HEVC and AVC Mastering Display Colour Volume (SMPTE ST 2086 [2]) SEI message syntax elements as respec... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.4 SDR picture characteristics | SDR picture characteristics (input SDR format of the reconstruction process) are defined in Table 3. Table 3: Syntax of sdr_characteristics( ) Syntax No. of bits sdr_characteristics( ) { sdrPicColourSpace sdrMasterDisplayColourSpace } 2 2 |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.5 Luminance mapping variables | The luminance mapping variables are specified by syntax elements present in Table 4. Luminance mapping variables are invoked when payloadMode is equal to 0. Table 4: Syntax of luminance_mapping_variables( ) Syntax No. of bits luminance_mapping_variables( ) { tmInputSignalBlackLevelOffset tmInputSignalWhiteLevelOffset s... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.6 Colour correction adjustment variables | The colour correction adjustment variables are specified by syntax elements present in Table 5. Colour correction adjustment variables are invoked when payloadMode is equal to 0. Table 5: Syntax of colour_correction_adjustment( ) Syntax No. of bits colour_correction_adjustment( ) { saturationGainNumVal for( i = 0; i < ... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.7 Luminance mapping table | The luminance mapping variables are specified by syntax elements present in Table 6. Luminance mapping table is invoked when payloadMode is equal to 1. Table 6: Syntax of luminance_mapping_table( ) Syntax No. of bits luminance_mapping_table( ) { luminanceMappingNumVal for( i = 0; i < luminanceMappingNumVal; i++) { lumi... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.2.8 Colour correction table | The colour correction table is specified by syntax elements present in Table 7. Colour correction table is invoked when payloadMode is equal to 1. Table 7: Syntax of colour_correction_table( ) Syntax No. of bits colour_correction_table( ) { colourCorrectionNumVal for( i = 0; i < colourCorrectionNumVal; i++) { colourCor... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3 Reconstruction metadata semantics | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1 HDR reconstruction information | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1.1 Introduction | The hdr_reconstruction_info contains the dynamic metadata that enables reconstruction of an HDR picture (as described in clause 7) when combined with the associated SDR picture. |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1.2 specVersion - Specification version | This 4-bit code indicates the specification version to which the current bitstream conforms to. Dynamic metadata bitstreams that conform to the present document shall be equal to '0b0000'. |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1.3 payloadMode - Payload mode | This variable indicates the carriage mode used to implement the dynamic metadata. Dynamic metadata bitstreams that conform to the present document shall be equal to 0b0000 or 0b0001 only, see Table 8. Table 8: Payload mode Value of payloadMode Carriage mode 0b0000 Parameter-based 0b0001 Table-based 0b0010 - 0b1111 Rese... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1.4 chromaToLumaInjectionMuA | This variable shall be present when payloadMode is equal to 1. This variable indicates the ratio of the blue colour-difference component injection into the luma component. The value shall be in the bounded range [0 to 0,5] and in multiples of (1÷16 384). The variable muA shall be derived as follows: • muA = chromaToLum... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.1.5 chromaToLumaInjectionMuB | This variable shall be present when payloadMode is equal to 1. This variable indicates the ratio of the red colour-difference component injection into the luma component. The value shall be in the bounded range [0 to 0,5] and in multiples of (1÷16 384). The variable muB shall be derived as follows: • muB = chromaToLuma... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2 Reconstructed HDR picture characteristics | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2.1 Introduction | The hdr_characteristics( ) contains reconstructed HDR picture signal characteristics namely: an indication on the colour space in which the HDR picture is represented, an indication on the primaries of the HDR display used to master the HDR picture and the minimum and maximum luminance of the mastering display used to ... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2.2 hdrPicColourSpace | This variable indicates the white point and primaries chromaticity coordinates of the HDR picture colour space in terms of CIE 1931 definitions of x and y as specified in ISO 11664-1 [12] and defined in Table 9. Table 9: HDR video colour primaries and white point Value of hdrPicColourSpace Primaries NOTE 0 primary x y ... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2.3 hdrMasterDisplayColourSpace | This variable indicates the white point and chromaticity coordinates of the HDR mastering display primaries in terms of CIE 1931 definitions of x and y as specified in ISO 11664-1 [12] and defined in Table 10. ETSI ETSI TS 103 433 V1.1.1 (2016-08) 19 Table 10: HDR mastering display colour primaries and white point Valu... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2.4 hdrMasterDisplayMaxLuminance | This variable specifies the nominal maximum display luminance of the mastering display used to grade the HDR picture in candela per square metre and in multiples of 50 candelas per square metre. hdrMasterDisplayMaxLuminance shall be greater than hdrMasterDisplayMinLuminance. The proper value of this variable shall be p... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.2.5 hdrMasterDisplayMinLuminance | This variable specifies the nominal minimum display luminance of the mastering display used to grade the HDR picture in candela per square metre. hdrMasterDisplayMinLuminance shall be less than hdrMasterDisplayMaxLuminance. If the proper value of this variable is unknown, it is recommended that it is set to 0. |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.3 SDR picture characteristics | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.3.1 Introduction | The sdr_characteristics( ) contains SDR picture (coming from the HDR-to-SDR signal decomposition stage non normatively but informatively documented in the present document) signal characteristics namely: an indication on the colour space in which the SDR picture is represented and an indication on the primaries of the ... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.3.2 sdrPicColourSpace | This variable indicates the white point and primaries chromaticity coordinates of the SDR picture colour space in terms of CIE 1931 definitions of x and y as specified in ISO 11664-1 [12] and defined in Table 11. ETSI ETSI TS 103 433 V1.1.1 (2016-08) 20 Table 11: SDR video colour primaries and white point Value of sdrP... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.3.3 sdrMasterDisplayColourSpace | This variable indicates the white point and chromaticity coordinates of the SDR mastering display primaries in terms of CIE 1931 definitions of x and y as specified in ISO 11664-1 [12] and defined in Table 12. Table 12: SDR mastering display colour primaries and white point Value of sdrMasterDisplayColourSpace Primarie... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4 Luminance mapping variables | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.1 Introduction | The luminance mapping variables defined in this clause are representative of the square-root of the inverse luminance mapping curve and are used to construct the look-up table lutMapY. This look-up table is taken as one input of the SDR-to-HDR reconstruction process specified in clause 7. The variables specified in thi... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.4 shadowGain - Shadow Gain Control | This variable indicates the gain that is used to adjust the steepness of the luminance mapping curve in its shadow (darker) region. The value shall be in the bounded range [0 to 2] and in multiples of (2 ÷ 255). |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.5 highlightGain - Highlight Gain Control | This variable indicates the gain that is used to adjust the steepness of the luminance mapping curve in its highlight (brighter) region. The value shall be in the bounded range [0 to 2] and in multiples of (2 ÷ 255). |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.6 midToneWidthAdjFactor - Mid-Tone Width Adjustment Factor | This variable indicates the gain that is used to adjust the width of the luminance mapping curve in their mid-tone region. The value shall be in the bounded range [0 to 2] and in multiples of (2 ÷ 255). 6.3.4.7 tmOutputFineTuningNumVal - Number of Tone Mapping Output Fine Tuning Function Curve Points This variable spec... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.8 tmOutputFineTuningX - Tone Mapping Output Fine Tuning Function x values | This variable indicates the xi values of the tone mapping output fine tuning function. The value shall be in the bounded range [0 to 1] and in multiples of (1 ÷ 255). The value of tmOutputFineTuningX[ i + 1 ] shall be greater than the value of tmOutputFineTuningX[ i ], for i in the range of 0 to tmOutputFineTuningNumVa... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.4.9 tmOutputFineTuningY - Tone Mapping Output Fine Tuning Function y values | This variable indicates the yi values of the tone mapping output fine tuning function, fftlum( ). The value shall be in the bounded range [0 to 1] and in multiples of (1 ÷ 255). When tmOutputFineTuningX[ 0 ] is greater than 0, an initial linear segment shall be inferred that maps input values ranging from 0 to tmOutput... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.5 Colour correction adjustment variables | |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.5.1 Introduction | The colour correction variables defined in this clause are used to adjust the default colour correction curve, implemented by the look-up table lutCC. This look-up table is derived from the square-root of the inverse luminance mapping curve. The colour correction curve is a required input of the SDR-to-HDR reconstructi... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.5.2 saturationGainNumVal - Number of Saturation Gain Function Curve Points | This variable specifies the number of pivot points in the piece-wise linear saturation gain function, fsgf ( ), that maps a colour correction input value to a saturation scaling factor. The value of saturationGainNumVal shall be in the bounded range [0 to 6]. See clause 7.3 for the computation of fsgf ( ) from the list... |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.5.3 saturationGainX - Saturation Gain Function x values | This variable indicates the xi values of the saturation gain function. The value shall be in the bounded range [0 to 1] and in multiples of (1 ÷ 255). The value of saturationGainX[ i + 1 ] shall be greater than the value of saturationGainX[ i ], for i in the range of 0 to saturationGainNumVal - 2, inclusive. |
c86f5e710ab461d7d5499b4a8bbac9c2 | 103 433 | 6.3.5.4 saturationGainY - Saturation Gain Function y values | This variable indicates the yi values of the saturation gain function. The value shall be in the bounded range [0 to 1] and in multiples of (1 ÷ 255). When saturationGainX[ 0 ] is greater than 0, an initial linear segment shall be inferred that maps input values ranging from 0 to saturationGainX[ 0 ], inclusive, to tar... |
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