ETSI TS 103 433-2 V1.2.1 (2020-03)

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)

RTS/JTC-051-2

General Information

• Status: Published
• Publication Date: 19-Mar-2020
• Technical Committee: BROADCAS - EBU/CENELEC/ETSI on Broadcasting
• Current Stage: 12 - Completion
• Due Date: 20-Mar-2020
• Completion Date: 20-Mar-2020

Standards Content (Sample)

ETSI TS 103 433-2 V1.2.1 (2020-03)






TECHNICAL SPECIFICATION
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)

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2 ETSI TS 103 433-2 V1.2.1 (2020-03)



Reference
RTS/JTC-051-2
Keywords
broadcasting, content, digital, distribution, HDR,
HDTV, UHDTV, video
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3 ETSI TS 103 433-2 V1.2.1 (2020-03)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 7
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definition of terms, symbols, abbreviations and conventions . 10
3.1 Terms . 10
3.2 Symbols . 11
3.2.1 Arithmetic operators . 11
3.2.2 Mathematical functions . 12
3.3 Abbreviations . 12
3.4 Conventions . 13
4 End-to-end system . 13
5 HDR system architecture. 14
6 Dynamic metadata format for HDR-to-HDR/SDR adaptation . 14
7 HDR-to-HDR/SDR signal reconstruction process . 17
7.1 Input streams . 17
7.2 Reconstruction process of an SDR or HDR stream . 17
7.2.1 Introduction. 17
7.2.2 Selecting a reconstruction mode . 18
7.2.3 Luminance mapping and colour correction tables construction . 18
7.2.3.1 Luminance mapping table construction from variables (payloadMode 0) . 18
7.2.3.1.1 Introduction . 18
7.2.3.1.2 Overview of the computation of lutMapY . 19
7.2.3.1.3 Block "To perceptual uniform signal" . 19
7.2.3.1.4 Block "Black/white level adaptation" . 20
7.2.3.1.5 Block "Tone mapping curve" . 20
7.2.3.1.6 Block "Adjustment curve" . 22
7.2.3.1.7 Block "Gain limiter" . 23
7.2.3.1.8 Block "To linear signal" . 24
7.2.3.1.9 Block "Inverse EOTF" . 24
7.2.3.2 Colour correction table construction from parameter-based mode (payloadMode 0) . 24
7.2.3.3 Luminance mapping table retrieval (payloadMode 1) . 25
7.2.3.4 Colour correction table retrieval (payloadMode 1) . 26
7.2.4 HDR/SDR picture reconstruction from look-up tables and HDR picture . 26
7.3 Metadata recomputation for presentation display adaptation . 28
7.3.1 Introduction. 28
7.3.2 Scaling factor computation . 28
7.3.3 Recomputation for "Black/white level adaptation" parameters . 29
7.3.4 Recomputation for "Tone mapping curve" parameters . 29
7.3.5 Recomputation for "Adjustment curve" parameters . 30
Annex A (normative): SL-HDR reconstruction metadata using HEVC . 32
Annex B (informative): SL-HDR reconstruction metadata using AVC . 34
Annex C (informative): HDR-to-SDR decomposition principles and considerations . 35
Annex D (informative): Gamut mapping . 36
ETSI

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4 ETSI TS 103 433-2 V1.2.1 (2020-03)
Annex E (informative): Embedded data on CE digital video interfaces . 37
E.1 Introduction . 37
E.2 Supported video formats . 37
E.3 Metadata packets . 37
E.3.1 Introduction . 37
E.3.2 Metadata packet syntax . 37
E.3.3 Metadata packet semantics . 38
E.3.4 Metadata packet embedding . 39
E.4 Graphics Indicator bit . 39
E.5 Signalling SL-HDR Dynamic Metadata . 40
E.5.1 Introduction . 40
E.5.2 VSVDB to signal SL-HDR support . 40
E.5.3 SL-HDR Dynamic Metadata InfoFrame . 40
Annex F (informative): Error-concealment: recovery in post-processor from metadata loss or
corruption . 42
F.1 Introduction . 42
F.2 Metadata values for recovery mode . 42
F.3 Recovery of shadow_gain_control with MDCV SEI message . 43
F.4 Recovery of shadow_gain_control without MDCV SEI message . 43
Annex G (informative): ETSI TS 103 433 signalling in CTA-861-G. 44
Annex H (informative): Minimum and maximum value of L for display adaptation . 45
pdisp
Annex I (informative): SL-HDR2+ and adaptive presentation display adaptation . 46
I.1 Introduction & system architecture . 46
I.2 SL-HDR2+ dynamic metadata . 47
I.2.1 Introduction . 47
I.2.2 Ldistr - hdrDistributedMaxLuminance . 47
I.2.3 LHDR_o - hdrOriginalMaxLuminance . 48
I.2.4 Recovery from metadata loss or corruption. 48
I.3 SL-HDR2+ HDR-to-HDR/SDR signal reconstruction process. 48
I.3.1 Introduction . 48
I.3.2 SL-HDR2+ Luminance mapping table construction from variables (payloadMode 0) . 49
I.3.2.1 Introduction. 49
I.3.2.2 Overview of the computation of lutMapY . 50
I.3.2.3 Block "To perceptual uniform signal" . 51
I.3.2.4 Block "Black/white level adaptation" . 51
I.3.2.5 Block "Tone mapping curve" . 52
I.3.2.6 Block "Adjustment curve" . 52
I.3.2.7 Block "Gain limiter" . 52
I.3.2.8 Block "To linear signal". 52
I.3.2.9 Block "Inverse EOTF" . 52
I.3.2.10 Block "Adjustment curve up" . 52
I.3.2.11 Block "Inverse tone mapping curve" . 53
I.3.2.12 Block "Black/white level adaptation up" . 53
I.3.2.13 Block "Gain limiter up" . 54
I.3.2.14 Block "Conversion to original metadata LHDR_o" . 54
I.3.2.14.1 Introduction . 54
I.3.2.14.2 Computation of original "Tone mapping curve" parameters . 55
I.3.2.14.3 Computation of original "Black/white level adaptation" parameters . 57
I.3.2.14.4 Computation of original "Adjustment curve" parameters . 59
I.3.2.14.5 Computation of original "Saturation Gain" parameters . 60
ETSI

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5 ETSI TS 103 433-2 V1.2.1 (2020-03)
I.3.2.15 Block "Metadata recomputation to Ldistr". 61
I.3.2.16 Block "Metadata recomputation to Lpdisp" . 63
I.3.2.17 The computation of lutMapY . 64
HDR
I.3.3 Colour correction table construction from parameter-based mode (payloadMode 0) . 64
I.3.4 HDR/SDR picture reconstruction from look-up tables and distributed HDR picture . 65
I.4 SL-HDR2+ HDR-to-SDR decomposition principles and considerations . 65
I.4.1 Introduction . 65
I.4.2 Block "Picture analysis" . 66
I.4.3 Block "HDR-to-SDR reconstruction" . 67
I.4.4 Block "HDR-to-HDR reconstruction" . 67
I.4.5 Block "Metadata conversion to distribution channel" . 67
I.4.5.1 Introduction. 67
I.4.5.2 Computation of distributed "Tone mapping curve" parameters . 69
I.4.5.3 Computation of distributed "Black/white level adaptation" parameters . 70
I.4.5.4 Computation of distributed "Adjustment curve" parameters . 72
I.4.5.5 Computation of distributed "Saturation Gain" parameters. 73
I.5 Display adaptation tuning . 75
Annex J (informative): SL-HDR metadata indication for CMAF based applications . 77
Annex K (informative): Use of SL-HDR in DVB Services . 78
Annex L (informative): Change History . 79
History . 80

ETSI

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6 ETSI TS 103 433-2 V1.2.1 (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
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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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 2 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
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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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7 ETSI TS 103 433-2 V1.2.1 (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 the present document 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.
Similar to SL-HDR1, these enhancements will be 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. 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 HDR video
frame and associated dynamic metadata and the characteristic of the attached HDR compliant rendering device in order
to optimize the HDR picture for the rendering device as specified in clause 7.
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8 ETSI TS 103 433-2 V1.2.1 (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. 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 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. Eventually,
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. Annex I describes a variation (called SL-HDR2+), where the distributed signal has a
maximum luminance in between the maximum luminance of SDR and that of the original HDR signal. Decoders
according to Annex I can reconstruct the original HDR signal, the SDR signal and an output signal with any maximum
luminance in between that of SDR and the original HDR signal, where decoders according to clause 7 can reconstruct
an output signal with any maximum luminance in between that of SDR and the distributed HDR signal. Finally,
Annex J provides information on SL-HDR metadata indication for CMAF based applications, and informative Annex K
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
Normative/Informative
Clause/Annex # Description
(in the present document)
Clause 1 Scope of the document Informative
Clause 2 References used in the document Normative/Informative
Clause 3 Definitions of terms, symbols and 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-conceal
...