ETSI TS 103 433-3 V1.1.1 (2020-03)

ETSI TS 103 433-3 V1.1.1 (2020-03)






TECHNICAL SPECIFICATION
High-Performance Single Layer High Dynamic Range (HDR)
System for use in Consumer Electronics devices;
Part 3: Enhancements for Hybrid Log Gamma (HLG)
transfer function based High Dynamic Range (HDR)
Systems (SL-HDR3)

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2 ETSI TS 103 433-3 V1.1.1 (2020-03)



Reference
DTS/JTC-040-3
Keywords
broadcasting, content, digital, distribution, HDR,
HDTV, UHDTV, video
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3 ETSI TS 103 433-3 V1.1.1 (2020-03)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 5
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols, abbreviations and conventions . 8
3.1 Terms . 8
3.2 Symbols . 9
3.2.1 Arithmetic operators . 9
3.2.2 Mathematical functions . 9
3.3 Abbreviations . 9
3.4 Conventions . 10
4 End-to-end system . 10
5 HDR system architecture. 11
6 Dynamic metadata format for HDR-to-HDR/SDR adaptation . 11
7 HDR-to-HDR/SDR signal reconstruction process . 12
7.1 Input streams . 12
7.2 Reconstruction process of an SDR or HDR stream . 12
Annex A (normative): SL-HDR reconstruction metadata using HEVC . 14
Annex B (informative): SL-HDR reconstruction metadata using AVC . 16
Annex C (informative): HDR-to-SDR decomposition principles and considerations . 17
Annex D (informative): Gamut mapping . 19
Annex E (informative): Embedded data on CE digital video interfaces . 20
Annex F (informative): Error-concealment: recovery in post-processor from metadata loss or
corruption . 21
Annex G (informative): ETSI TS 103 433 signalling in CTA-861-G. 22
Annex H (informative): Minimum and maximum value of L for display adaptation . 23
pdisp
Annex I (informative): SL-HDR metadata indication for CMAF based applications . 24
Annex J (informative): Use of SL-HDR in DVB Services . 25
Annex K (informative): Change History . 26
History . 27

ETSI

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4 ETSI TS 103 433-3 V1.1.1 (2020-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by Joint Technical Committee (JTC) Broadcast of the European
Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European
Telecommunications Standards Institute (ETSI).
The present document is part 3 of a multi-part deliverable. Full details of the entire series can be found in part 1 [1].
NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the
specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body
by including in the Memorandum of Understanding also CENELEC, which is responsible for the
standardization of radio and television receivers. The EBU is a professional association of broadcasting
organizations whose work includes the co-ordination of its members' activities in the technical, legal,
programme-making and programme-exchange domains. The EBU has active members in about
60 countries in the European broadcasting area; its headquarters is in Geneva.
European Broadcasting Union
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: +41 22 717 21 11
Fax: +41 22 717 24 81
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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5 ETSI TS 103 433-3 V1.1.1 (2020-03)
Introduction
Motivation
Today Ultra HD services have been launched or are being launched by broadcasters and network operators in many
regions of the world. Besides higher resolution, wider colour gamut and higher frame rate, High Dynamic Range is a
highly demanded feature.
The goal of ETSI TS 103 433-1 [1], SL-HDR1, is to standardize a single layer HDR system addressing direct SDR
backwards compatibility i.e. a system leveraging SDR distribution networks and services already in place and that
enables high quality HDR rendering on HDR-enabled CE devices including high quality SDR rendering on SDR CE
devices.
The goal of ETSI TS 103 433-2 [2], SL-HDR2, is to specify enhancements for single layer Perceptual Quantization
(PQ) transfer function based HDR systems, enabled by signal processing blocks that are similar/the same to those in
SL-HDR1.
The goal of the present document is to specify enhancements for single layer Hybrid Log Gamma (HLG) transfer
function based HDR systems, enabled by signal processing blocks that are similar/the same to those in SL-HDR1 and
SL-HDR2. Similar to SL-HDR1 and SL-HDR2, these enhancements are enabled by use of dynamic metadata and a post
processor in the Consumer Electronics device.
Pre-processing
At the distribution stage, an incoming HDR signal is analysed and content-dependent dynamic metadata is produced.
This dynamic metadata can be produced in an automatic process or in a manual process where the image quality
resulting of the metadata that has been set manually is judged on an SDR grading monitor and/or on a distribution
channel grading monitor. This dynamic metadata can be used to create an optimal picture for a display that has different
characteristics, most noticeably a different maximum luminance, than the display used when grading the HDR content.
The HDR signal is encoded with any distribution codec (e.g. HEVC as specified in part 1 [1], Annex A) and carried
throughout an HDR distribution network with accompanying metadata conveyed on a specific channel or embedded in
an HDR bitstream. The dynamic metadata can for instance be carried in an SEI message when used in conjunction with
an HEVC codec. The pre-processor that produces dynamic metadata is not a normative requirement of the present
document. Nonetheless, the pre-processor is expected to produce a dynamic metadata stream matching the syntax
specified in Annex A and Annex B.
Post-processing
The post-processing stage occurs just after HDR bitstream decoding. The post-processing takes as input an HLG video
frame and associated dynamic metadata and the characteristic of the attached rendering device in order to optimize the
HDR picture for the rendering device as specified in clause 7.
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6 ETSI TS 103 433-3 V1.1.1 (2020-03)
Structure of the present document
The present document is structured as follows. Clause 1 provides the scope of the present document. Clause 2 provides
references used in the present document. Clause 3 gives essential definition of terms, symbols and abbreviations used in
the present document. Clause 4 provides information on the end to end system. Clause 5 details the architecture of the
HDR system. Clause 6 specifies the format of the content-based dynamic metadata common to systems based on ETSI
TS 103 433 multi-part documents [i.2]. Specifically to the present document, the metadata are produced during the
HDR-to-SDR decomposition stage and they enable reconstruction of the SDR signal from the decoded HDR signal
using those metadata. Clause 7 specifies the reconstruction process of the SDR signal and an HDR signal that is adapted
to the maximum luminance of the presentation display. The dynamic metadata format specified in clause 6 is
normatively mapped from SEI messages representative of the SL-HDR system that are specified for HEVC and AVC
respectively in Annex A and Annex B. Informative Annex C and Annex D provide information on an HDR-to-SDR
decomposition process, and a gamut mapping process. Informative Annex E describes a way to transfer dynamic
metadata by embedding it in the video transferred over a CE digital video interface. Informative Annex F proposes a
recovery procedure when dynamic metadata are detected as missing by the post-processor during the HDR signal
reconstruction. The recovery procedure may also be applied in case it is desirable to replace the original metadata by a
fixed tone mapping function, e.g. when graphics overlays are inserted on the decoded video by a mid-device (e.g. STB)
which transmits SL-HDR reconstruction metadata as well as the mixed video to an SL-HDR capable TV. Informative
Annex G gives reference to a standard mechanism to carry SL-HDR reconstruction metadata through interfaces and
Annex H provides a recommendation on the maximum presentation display luminance that display adaptation can be
used with. Finally,Annex I provides information on SL-HDR metadata indication for CMAF based applications, and
informative Annex J provides information on the use of SL-HDR in DVB Services.
The structure of the present document is summarized in Table 1.
Table 1: Structure of the present document
Clause/Annex Description Normative/Informative
# (in the present document)
Clause 1 Scope of the document Informative
Clause 2 References used in the document Normative/Informative
Clause 3 Definition of terms, symbols, abbreviations Informative
Clause 4 End-to-end system Informative
Clause 5 Architecture of the HDR system Informative
Clause 6 Metadata format abstraction layer (agnostic to the Normative
distribution format)
Clause 7 HDR-to-HDR/SDR reconstruction process Normative
Annex A SL-HDR reconstruction metadata using HEVC Normative
Annex B SL-HDR reconstruction metadata using AVC Informative
Annex C HDR-to-SDR decomposition principles and Informative
considerations
Annex D Gamut mapping Informative
Annex E Embedded data on CE digital video interfaces Informative
Annex F Error-concealment and recovery procedure Informative
Annex G ETSI TS 103 433 [i.2] signalling in CTA-861-G Informative
Annex H
Minimum and maximum value of for display Informative
adaptation
Annex I SL-HDR metadata indication for CMAF based Informative
applications
Annex J Use of SL-HDR in DVB Services Informative
Annex K Change History Informative

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7 ETSI TS 103 433-3 V1.1.1 (2020-03)
1 Scope
The present document specifies the HDR-to-HDR/SDR content-based dynamic metadata and the post-decoding process.
The post-decoding process takes the specified metadata and an HLG HDR signal as input, and enables the
2
reconstruction of an SDR signal (typically 100 cd/m ) or an HDR signal with a maximum luminance ranging from
2
100 cd/m to a maximum luminance that is greater than that of the original HDR signal. This reconstruction process is
typically invoked in a Consumer Electronics device such as a TV set, a smartphone, a tablet or a Set Top Box. Besides,
it provides information and recommendations on the usage of the described HDR system.
2 References
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 are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 103 433-1: "High-Performance Single Layer High Dynamic Range (HDR) System for
use in Consumer Electronics devices; Part 1: Directly Standard Dynamic Range (SDR)
Compatible HDR System (SL-HDR1)".
[2] ETSI TS 103 433-2: "High-Performance Single Layer High Dynamic Range (HDR) System for
use in Consumer Electronics devices; Part 2: Enhancements for Perceptual Quantization (PQ)
transfer function based High Dynamic Range (HDR) Systems (SL-HDR2)".
[3] Recommendation ITU-R BT.709-6 (06-2015): "Parameter values for HDTV standards for
production and international programme exchange".
[4] Recommendation ITU-R BT.2020-2 (10-2015): "Parameter values for ultra-high definition
television systems for production and international programme exchange".
[5] Recommendation ITU-R BT.2100-2 (07/2018): "Image parameter values for high dynamic range
television for use in production and international programme exchange".
[6] Recommendation ITU-R BT 2390-6 (04/2019): "High dynamic range television for production
and international programme exchange".
[7] Recommendation ITU-T H.264 (04-2017): "Advanced video coding for generic audiovisual
services".
[8] Recommendation ITU-T H 265 (12-2016): "High efficiency video coding".
[9] SMPTE ST 2086:2014: "Mastering Display Color Volume Metadata Supporting High Luminance
and Wide Color Gamut Images".
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8 ETSI TS 103 433-3 V1.1.1 (2020-03)
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 included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] CTA Standard CTA-861-G, November 2016: "A DTV Profile for Uncompressed High Speed
Digital Interfaces".
[i.2] ETSI TS 103 433 (all parts): "High-Performance Single Layer High Dynamic Range (HDR)
System for use in Consumer Electronics devices".
[i.3] Recommendation ITU-R BT 2035: "A reference environment for evaluation of HDTV program
material or completed programmes".
[i.4] SMPTE Engineering Guideline EG 28-1993: "Annotated Glossary of Essential Terms for
Electronic Production".
[i.5] SMPTE ST 2094-20:2016: "Dynamic Metadata for Color Volume Transform - Application #2".
[i.6] SMPTE ST 2094-30:2016: "Dynamic Metadata for Color Volume Transform - Application #3".
3 Definition of terms, symbols, abbreviations and
conventions
3.1 Terms
For the purposes of the present document, the following terms 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
display adaptation: adaptation of a video signal to the characteristics of the targeted Consumer Electronics display
(e.g. maximum luminance of the CE display)
dynamic metadata: metadata that can be different for different portions of the video and can change at each associated
picture
gamut: complete subset of colours which can be represented within a given colour space or by a certain output device
NOTE: Also known as colour gamut.
gamut mapping: mapping of the colour space coordinates of the elements of a source image to colour space
coordinates of the elements of a reproduction
NOTE: Gamut mapping intent is not to change the dynamic range of the source but to compensate for differences
in the source and output medium colour gamut capability.
High Dynamic Range (HDR) system: system specified and designed for capturing, processing, and reproducing a
scene, conveying the full range of perceptible shadow and highlight detail, with sufficient precision and acceptable
artefacts, including sufficient separation of diffuse white and specular highlights
luma: linear combination of non-linear-light (gamma-corrected) primary colour signals
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luminance: objective measure of the visible radiant flux weighted for colour by the CIE Photopic Spectral Luminous
Efficiency Function [i.4]
luminance mapping: adjustment of the luminance representative of a source signal to the luminance of a targeted
system
post-production: part of the process of filmmaking and video production gathering many different processes such as
video editing, adding visual special effects, transfer of colour motion picture film to video
presentation display: display that the IRD outputs to
reconstructed picture: output picture of SL-HDR post-processing stage
Single Layer High Dynamic Range (SL-HDR) system: system implementing at least one of the parts of the
ETSI TS 103 433 multi-part document [i.2]
source picture: input picture of SL-HDR pre-processing stage
NOTE: Typically an HDR picture coming from post-production facilities.
Standard Dynamic Range (SDR) system: system having a reference reproduction using a luminance range
constrained by Recommendation ITU-R BT 2035 [i.3], section 3.2
NOTE: Typically no more than 10 stops.
Supplemental Enhancement Information (SEI) message: carriage mechanism defined in Recommendation
ITU-T H.264 [7] and Recommendation ITU-T H 265 [8] that is intended to assist in processes related to decoding,
display or other purposes
3.2 Symbols
3.2.1 Arithmetic operators
Void.
3.2.2 Mathematical functions
Void.
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
EOTF Electro-Optical Transfer Function
HDMI High-Definition Multimedia Interface
HDR High Dynamic Range
HEVC High Efficiency Video Coding
IRD Integrated Receiver Decoder
MDCV Mastering Display Colour Volume
OETF Opto-Electrical Transfer Function
PQ Perceptual Quantization
SEI Supplemental Enhancement Information (as in AVC and HEVC)
SL-HDR Single Layer High Dynamic Range
SL-HDRI Single Layer High Dynamic Range Information
SMPTE Society of Motion Picture and Television Engineers
STB Set Top Box
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10 ETSI TS 103 433-3 V1.1.1 (2020-03)
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 lower camel case style
e.g. camelCase. All those variables are described in clause 6.
• Internal variables of the present document are indicated by italic Cambria math font 10 points style
e.g. variable.
• Structures of syntactic elements or structures of variables are indicated by Arial font 9 points C-style with
parentheses e.g. structure_of_variables( ). Those structures are defined in clause 6 of part 1 [1], Annex A of
part 1 [1], and Annex B of part 1 [1].
• Bitstream syntactic elements are indicated by bold Arial font 9 points C-style e.g. syntactic_element. All
those variables are defined in Annex A of part 1 [1] and in Annex B of part 1 [1].
• Functions are indicated as func( x ).
• Tables are indicated as table[ idx ].
4 End-to-end system
Figure 1 shows an end-to-end workflow supporting content production and delivery to HDR and SDR displays and to
displays with any maximum luminance level in-between SDR and HDR. The primary goal of this HDR workflow is to
provide direct HLG backwards compatible services i.e. services which associated streams are directly compatible with
HLG Consumer Electronics devices. This workflow is based on technologies and standards that facilitate an open
approach.
It includes a single-layer HDR encoding-decoding, and uses static and dynamic metadata:
• Mastering Display Colour Volume (MDCV) standardized in HEVC [8] and SMPTE ST 2086 [9]
specifications; and
• SL-HDR Information (SL-HDRI) based on both SMPTE ST 2094-20 [i.5] and SMPTE ST 2094-30 [i.6]
specifications.
Single-layer encoding/decoding requires only one encoder instance at HDR encoding side, and one decoder instance at
player/display side. It supports the real-time workflow requirements of broadcast applications.
The elements specifically addressed in the present document are related to the HDR/SDR reconstruction process and the
associated dynamic metadata format.

Figure 1: Example of an HDR end-to-end system
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11 ETSI TS 103 433-3 V1.1.1 (2020-03)
5 HDR system architecture
The block diagram in Figure 2 depicts in more detail the HDR decomposition and reconstruction processes of
SL-HDR3. The SL-HDR3 system makes use of the SL-HDR2+ extension in SL-HDR2, see Annex I of [2], to which the
diagonally shaded boxes are added. These boxes show "bridge point" conversions, see Recommendation
ITU-R BT.2390-6 [6], section 7.2. The centre block included in dash-red box corresponds to the distribution encoding
and decoding stages (e.g. based on HEVC video coding specifications). The left and right grey-coloured boxes
respectively enable format adaptation to the input video signal of the HDR system and to the targeted system (e.g. a
STB, a connected TV, etc.) connected with the HDR system. The black solid line boxes show the HDR specific
processing. The additional HDR dynamic metadata are transmitted on distribution networks typically by way of the SEI
messaging mechanism. The present document relates to both the HDR-to-HDR/SDR signal reconstruction process and
the HDR metadata format. The core components of the HDR decomposition stage are the HDR-to-distributed signal
2 2
decomposition that maps the input HDR with a maximum luminance larger than 1 000 cd/m to 1 000 cd/m for HLG
distribution, see the "bridge point" conversion in Recommendation ITU-R BT.2390-6 [6], section 7.2, and the
HDR-to-SDR decomposition that generates an SDR video from the HDR signal.
Using the additional HDR dynamic metadata, an SL-HDR3 decoder is able to:
• recreate the original HDR input at the production stage;
• recreate the SDR generated by the HDR-to-SDR decomposition at the production stage; and
2
• create outputs that are adapted to the maximum luminance of the attached display between 100 cd/m (SDR)
and values higher than that of the original HDR input at the production stage.
Optionally in the IRD, a block of gamut mapping may be used when the output HDR/SDR picture is represented in a
colour space or colour gamut different from the one of the connected display. The parameters of the optional gamut
mapping and their impact on the rendering may be controlled during the post-production stage.
Optionally in the IRD, a block of HDR-to-HDR signal reconstruction may be used as a display adaptation process. The
dynamic range output of the display adaptation process may be less and may be more than the dynamic range of the
HDR signal input to the HDR-to-SDR signal decomposition process. Figure
...