ARIB STD-B67

Parameter Values for the Hybrid Log-Gamma(HLG) High Dynamic Range Television(HDR-TV) System for Programme Production

ARIB STANDARD
ARIB STD-B67 Version 2.0

Version 1.0 July3, 2015
Version 2.0 January 22, 2018

Association of Radio Industries and Businesses

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ARIB STD-B67

Foreword
The Association of Radio Industries and Businesses (ARIB) investigates and summarizes thebasic technical requirements for various radio systems in the form of “ARIB Standards”. Thesestandards are developed with the participation of and through discussions amongst radio
equipment manufacturers, telecommunication operators, broadcasting equipment manufacturers,
broadcasters and users.
ARIB Standards include “government technical regulations” (mandatory standard) that are set
for the purpose of encouraging effective use of frequency and preventing interference with otherspectrum users, and “private technical standards” (voluntary standards) that are defined in orderto ensure compatibility and adequate quality of radio equipment and broadcasting equipment aswell as to offer greater convenience to radio equipment manufacturers, telecommunication
operators, broadcasting equipment manufacturers, broadcasters and users.
This ARIB Standard is developed for “Parameter Values for the Hybrid Log-Gamma (HLG)
High Dynamic Range Television (HDR-TV) System for Programme Production”. In order toensure fairness and transparency in the defining stage, the standard was set by consensus at theARIB Standard Assembly with the participation of both domestic and foreign interested parties
from radio equipment manufacturers, telecommunication operators, broadcasting equipment
manufacturers, broadcasters and users.
ARIB sincerely hopes that this ARIB Standard will be widely used by radio equipment
manufacturers, telecommunication operators, broadcasting equipment manufacturers,
broadcasters and users.
NOTE:
Although this ARIB Standard contains no specific reference to any Essential Industrial Property
Rights relating thereto, the holders of such Essential Industrial Property Rights state to the effectthat the rights listed in the Attachment 1 and 2, which are the Industrial Property Rights relating
to this standard, are held by the parties also listed therein, and that to the users of this standard, inthe case of Attachment 1, such holders shall not assert any rights and shall unconditionally granta license to practice such Industrial Property Rights contained therein, and in the case ofAttachment 2, the holders shall grant, under reasonable terms and conditions, a non-exclusive
and non-discriminatory license to practice the Industrial Property Rights contained therein.
However, this does not apply to anyone who uses this ARIB Standard and also owns and lays
claim to any other Essential Industrial Property Rights of which is covered in whole or part in thecontents of the provisions of this ARIB Standard.

Attachment 1（N/A）(selection of option 1)

Attachment 2（N/A）(selection of option 2)

ARIB STD-B67

Contents
Foreword
Chapter 1 General Descriptions ................................................................................................. 1
1.1 Objective .......................................................................................................................... 1
1.2 Scope ................................................................................................................................ 1
Chapter 2 System parameters for HDR-TV ............................................................................... 3
2.1 Image spatial and temporal characteristics ....................................................................... 3
2.2 System colorimetry .......................................................................................................... 3
2.3 Signal format .................................................................................................................... 3
2.4 Digital representation ....................................................................................................... 3-i-ARIB STD-B67

Chapter 1 General Descriptions
1.1 Objective
This standard specifies the system parameters for the Hybrid Log-Gamma (HLG) high dynamic
range television (HDR-TV) including image spatial and temporal characteristics, system
colorimetry, signal format and digital representation. The signal format is characterized by
opto-electronic transfer function (OETF).
1.2 ScopeThis standard applies to the video equipment for programme production of the Hybrid
Log-Gamma (HLG) high dynamic range television (HDR-TV).

-1-ARIB STD-B67<Blank Page>-2-

ARIB STD-B67

Chapter 2 System parameters for HDR-TV
2.1 Image spatial and temporal characteristics
The image spatial and temporal characteristics specified in TABLE 2-1 should be used forHDR-TV.

2.2 System colorimetry
The system colorimetry specified in TABLE 2-2 should be used for HDR-TV.

2.3 Signal format
The signal format specified in TABLE 2-3 should be used for HDR-TV.

2.4 Digital representation
The digital representation specified in TABLE 2-4 should be used for HDR-TV.

-3-ARIB STD-B67

TABLE 2-1 Image spatial and temporal characteristics
ParameterValues

Image Container1 Shape

16:9
7 680 × 4 320

Container Pixel count

3 840 × 2 160

Horizontal × Vertical

1 920 × 1 080

Sampling lattice

Orthogonal

Pixel aspect ratio

1:1 (square pixels)

Pixel addressing

Pixel ordering in each row is from left to right,
and rows are ordered from top to bottom.

Frame frequency (Hz)120, 120/1.001, 60, 60/1.001

Image Format

Progressive

NOTE 1 – Container is used to define the horizontal and vertical constraints of the image format.

TABLE 2-2 System colorimetry
ParameterValues

Opto-electronic transfer
characteristics before non-linear
pre-correction

Assumed linear
Chromaticity coordinates(CIE, 1931)

Primary colours
and reference white2xy

Red primary (R)

0.708

0.292

Green primary (G)

0.170

0.797

Blue primary (B)

0.131

0.046

Reference white (D65)

0.31270.3290NOTE 2 – The colorimetric values of the picture information can be determined based on the reference RGB
primaries and the reference white.

-4-ARIB STD-B67

TABLE 2-3 Signal format
Parameter

ValuesSignal format

R', G', B' or Y', C'B, C'R

3E0  E  1 / 12E   OETF E   a  ln 12 E  b   c 1 / 12  E  1

Reference opto-electronictransfer function (OETF)

where E is the signal for each colour component {RS, GS, BS} proportional toscene linear light and scaled by camera exposure, normalized to the range [0:1].
E' is the resulting non-linear signal {R', G', B'}.
a = 0.17883277, b  1 4a , c  0 .5  a  ln 4 a  3Derivation of Y’

Y'  0.2627 R'  0.6780G'  0.0593 B'
B'  Y'1.8814R'  Y'C R 1.4746

C B Derivation of colour
difference signals

NOTE 3 – The values of b and c are calculated to b = 0.28466892, c = 0.55991073.

-5-ARIB STD-B67

TABLE 2-4 Digital representation
Parameter

ValuesCoded signal

R', G', B' or Y', C'B, C'R

Sampling lattice

Orthogonal, line and picture repetitive co-sited– R', G', B', Y'Orthogonal, line and picture repetitive co-sited with each other.
The first (top-left) sample is co-sited with the first Y’ samples.
4:4:4 system

Sampling lattice

4:2:2 system
Horizontallysubsampled by afactor of two withrespect to the Y'component.

Each has the same
number of horizontal
samples as the Y'
component.

– C'B, C'R

Coding format

4:2:0 system
Horizontally andvertically subsampled
by a factor of two withrespect to the Y'
component.

10 or 12 bits per component

DR' = Round [(219  R' + 16)  2n−8]
DG' = Round [(219  G' + 16)  2n−8]
DB' = Round [(219  B' + 16)  2n−8]
DY' = Round [(219  Y' + 16)  2n−8]
DC'B = Round [(224  C'B + 128)  2n−8]Quantization of R', G', B',
Y', C'B, C'R

DC'R = Round [(224  C'R + 128)  2n−8]
Where:Round( x ) = Sign( x ) * Floor( | x | + 0.5 )Floor( x ) = the largest integer less than or equal to x
1 ; x0Sign( x ) =  0 ; x  0
 1 ; x  0
The n represents the bit depth of coding format.

Quantization levels

10-bit coding

12-bit coding

0 - 3 and 1 020 - 1 023

0 - 15 and 4 080 - 4 095

4 - 1 019

16 - 4 079

Nominal Peak (100%)

940

3 760

Black (0%)

64

256

Nominal Peak (+50%)

960

3 840

Achromatic (0%)

512

2 048

Nominal Peak (-50%)

64

256

Timing ReferenceVideo data
DR', DG',
DB', DY'

DC'B, DC'R

-6-

ARIB STD-B67

Version 2.0 Revision History
Page

Item No.

Description

ReasonTitle andForeword

Essential Parameter Values for the Hybrid Log-Gamma (HLG)
Extended Image High Dynamic Range Television (EIHDR-TV)
System for Programme Production

Clarification ofspecifiedcontents.

11.1

This standard specifies the system parameters essential for theHybrid Log-Gamma (HLG)extended image high dynamic range
television (EIHDR-TV) including image spatial and temporalcharacteristics, system colorimetry, signal format and digital
representation. The signal format is characterized by
opto-electronic transfer function (OETF). For the other systemparameters, other television system standards may be referredto.

Ensureconsistency
with ITU-R
BT.2100-1.

11.2(Editorial revision due to title change.)1

Footnote 1(Delete all text because it is no longer needed.)3

Chapter title(Editorial revision due to title change.)3

2.1(Add full text to ensure consistency with Recommendation ITU-R BT.2100-1.)

3

2.2 - 2.4

(Renumber the sections 2.1 – 2.3 to the sections 2.2 – 2.4 due to newly added
section 2.1.)

4

TABLE 2-1

(Add the whole table to ensure consistency with Recommendation ITU-R
BT.2100-1.)

4

TABLE 2-2

(Renumber TABLE 2-1 and NOTE 1 to TABLE 2-2 and NOTE 2, respectively,
due to the insertion of TABLE 2-1 and NOTE 1, and fix a typo.)

4-7

TABLE 2-3 ~2-4(Renumber TABLEs 2-2 and 2-3 to TABLEs 2-3 and 2-4, respectively.)

5

TABLE 2-3

(Use the same mathematical expression as Recommendation ITU-R BT.2100-1.)

6

TABLE 2-4

(Use the same mathematical expression as Recommendation ITU-R BT.2100-1,
and delete constant “r”. )(1)

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Parameter Values for the Hybrid Log-Gamma (HLG)
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/Parameter Values for the Hybrid Log-Gamma (HLG) HighDynamic Range Television (HDRTV) System
for Programme Production
ARIB STANDARD
ARIB STD-B67

Version 2.0

Version 1.0

July

Version 2.0

January 22, 2018

Published

3, 2015

byAssociation of Radio Industries and Businesses
11F, Nittochi Building,
1-4-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-0013, JapanTEL 03-5510-8590
FAX03-3592-1103