3D display devices - Part 12-2: Measuring methods for stereoscopic displays using glasses - Motion blur

IEC 62629-12-2:2019 specifies the measuring methods of motion artifacts for stereoscopic displays using glasses. This document is applicable to stereoscopic displays using glasses, which consist of transmissive type active matrix liquid crystal display modules (without a post image processing).

Dispositifs d'affichage 3D - Partie 12-2 : Méthodes de mesure pour les écrans stéréoscopiques utilisant des lunettes - Flou de mouvement

L'IEC 62629-12-2:2019 spécifie les méthodes de mesure des artéfacts de mouvement pour les écrans stéréoscopiques utilisant des lunettes. Le présent document s’applique aux écrans stéréoscopiques utilisant des lunettes, qui consistent en des modules d'affichage à cristaux liquides à matrice active de type transmissif (sans post-traitement d’image).

General Information

Status
Published
Publication Date
27-Mar-2019
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
28-Mar-2019
Ref Project

Buy Standard

Standard
IEC 62629-12-2:2019 - 3D display devices - Part 12-2: Measuring methods for stereoscopic displays using glasses - Motion blur
English and French language
47 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 62629-12-2
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
3D display devices –
Part 12-2: Measuring methods for stereoscopic displays using glasses –
Motion blur
Dispositifs d'affichage 3D –
Partie 12-2: Méthodes de mesure pour les écrans stéréoscopiques utilisant
des lunettes – Flou de mouvement
IEC 62629-12-2:2019-03(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2019 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary

details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and

once a month by email. French extracted from the Terms and Definitions clause of

IEC publications issued since 2002. Some entries have been

IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and

If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org

webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au

La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en

en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans

comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire

projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary

Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais

Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des

Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées

antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
---------------------- Page: 2 ----------------------
IEC 62629-12-2
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
3D display devices –
Part 12-2: Measuring methods for stereoscopic displays using glasses –
Motion blur
Dispositifs d'affichage 3D –
Partie 12-2: Méthodes de mesure pour les écrans stéréoscopiques utilisant
des lunettes – Flou de mouvement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.120; 31.260 ISBN 978-2-8322-6687-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62629-12-2:2019  IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 7

4 Standard measuring conditions ........................................................................................ 7

4.1 Temperature, humidity and pressure conditions ...................................................... 7

4.2 Illumination conditions ............................................................................................ 7

5 Standard motion-blur measurement methods ................................................................... 8

5.1 General ................................................................................................................... 8

5.2 Direct measurement method ................................................................................... 8

5.2.1 Standard measuring process ........................................................................... 8

5.2.2 Analysis method ............................................................................................ 11

5.3 Indirect measurement method ............................................................................... 12

5.3.1 General ......................................................................................................... 12

5.3.2 Measurement system ..................................................................................... 12

5.3.3 Measurement process ................................................................................... 13

5.3.4 Data analysis ................................................................................................. 14

6 Test report ..................................................................................................................... 15

6.1 General ................................................................................................................. 15

6.2 Items to be reported .............................................................................................. 15

6.2.1 Environmental conditions ............................................................................... 15

6.2.2 Display parameters ........................................................................................ 15

6.2.3 Measuring method and conditions.................................................................. 16

6.2.4 Analysis method ............................................................................................ 16

Annex A (informative) Effect of binocular saccade on 3D motion blur ................................... 18

Annex B (informative) Motion contrast degradation .............................................................. 19

Annex C (informative) Activation of external 3D signal emitter ............................................. 21

Bibliography .......................................................................................................................... 22

Figure 1 – Example of edge blur test pattern of top/bottom 3D format ..................................... 8

Figure 2 – Example of pivoting pursuit camera system ............................................................ 9

Figure 3 – Example of linear pursuit camera system ............................................................... 9

Figure 4 – Example of luminance cross-section profile of a blurred edge with BET................ 11

Figure 5 – Example of luminance cross-section profile of a blurred edge with EBET ............. 12

Figure 6 – Set-up to measure the temporal step response .................................................... 13

Figure 7 – Example of temporal response of left or right view ............................................... 14

Figure 8 – Example of motion picture response curves ......................................................... 15

Figure 9 – Example of visually reporting BET analysis data .................................................. 16

Figure A.1 – Example of binocular saccade to follow the motion of 3D image ........................ 18

Figure B.1 – Example of motion contrast degradation test pattern ......................................... 19

Figure B.2 – Example of motion contrast degradation due to line spreading. ......................... 20

---------------------- Page: 4 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 3 –

Table 1 – Step response data for different luminance transitions .......................................... 10

Table 2 – Example of measuring conditions .......................................................................... 10

Table 3 – BET analysis data in 2D mode ............................................................................... 17

Table 4 – BET analysis data in 3D mode ............................................................................... 17

---------------------- Page: 5 ----------------------
– 4 – IEC 62629-12-2:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
3D DISPLAY DEVICES –
Part 12-2: Measuring methods for stereoscopic displays using
glasses – Motion blur
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62629-12-2 has been prepared by IEC technical committee 110:

Electronic displays.
The text of this International Standard is based on the following documents:
CDV Report on voting
110/978/CDV 110/1049/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

A list of all parts in the IEC 62629 series, published under the general title 3D display devices,

can be found on the IEC website.
---------------------- Page: 6 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 5 –

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 62629-12-2:2019  IEC 2019
3D DISPLAY DEVICES –
Part 12-2: Measuring methods for stereoscopic displays using
glasses – Motion blur
1 Scope

This part of IEC 62629 specifies the measuring methods of motion artifacts for stereoscopic

displays using glasses. This document is applicable to stereoscopic displays using glasses,

which consist of transmissive type active matrix liquid crystal display modules (without a post

image processing).

NOTE Motion blur measurement methods and analysis methods introduced in this document are not universal

tools for all different LCD motion enhancement technologies due to their complexity, and displays with some motion

quality enhancement technologies cannot be measured or analysed by the methods introduced in this document. If

this is the case, users are made aware of this.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 61747-30-1, Liquid crystal display devices – Part 30-1: Measuring methods for liquid

crystal display modules – Transmissive type
3 Terms, definitions and abbreviated terms

For the purposes of this document, the following terms, definitions and abbreviated terms

apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
motion picture response curve

curve, representing the convolution of the temporal step response with a moving window

function of 1-frame wide

Note 1 to entry: This shows how the luminance is integrated over time during smooth pursuit eye tracking and

combines the effects of the display response time and the hold-type characteristics of the device under test.

[SOURCE: IEC 61747-6-3:2011, 3.1, modified – the second part of the definition has been

made into a note.]
3.1.2
motion induced edge profile

luminance profile of an intrinsically sharp moving luminance transition when this transition is

followed with smooth pursuit eye tracking along its motion trajectory
---------------------- Page: 8 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 7 –

Note 1 to entry: The profile can be calculated from the motion picture response curve for any given motion speed.

[SOURCE: IEC 61747-6-3:2011, 3.2]
3.1.3
edge blur

blur that becomes visible on an intrinsically sharp transition between two adjacent areas, with

a different luminance level, when the transition smoothly moves across the display as a

function of time

Note 1 to entry: Preconditions for this type of edge blur are smooth pursuit eye tracking of the object, and no

obvious flicker, indicating that luminance integration with a frame period is allowed. This blur phenomenon is

mainly caused by a slow response time of the display device in combination with the hold-type characteristics.

[SOURCE: IEC 61747-6-3:2011, 3.3]
3.2 Abbreviated terms
BET blurred edge time
CCD charge-coupled device
CIE Commission Internationale de l’Eclairage (International Commission on
Illumination)
CMOS complimentary metal-oxide semiconductor
DUT display under test
DVI digital visual interface
EBET extended blurred edge time
IEC International Electrotechnical Commission
ISO International Organization for Standardization
LCD liquid crystal display
LMD light measuring device
LPF low-pass filtering
LVDS low-voltage differential signaling
MCD motion contrast degradation
MPRC motion picture response curve
4 Standard measuring conditions
4.1 Temperature, humidity and pressure conditions

The standard environmental conditions for the motion artifact measurement are as follows:

– temperature: (25 ± 3) °C
– relative humidity: 25 % to 85 %
– air pressure: 86 kPa to 106 kPa
4.2 Illumination conditions

The illuminance at the measuring spot of the DUT shall be below 1 lx (standard dark room

conditions as defined in IEC 61747-30-1).
---------------------- Page: 9 ----------------------
– 8 – IEC 62629-12-2:2019  IEC 2019
5 Standard motion-blur measurement methods
5.1 General

Motion induced object blur is the result of a slow response of the liquid crystal cells and a

stationary representation of the temporal image (related to the hold time of the display), in

combination with smooth pursuit eye-tracking of an object over the display surface. When an

object moves across the display and the eye is tracking this object, a spatiotemporal

integration of the object luminance is taking place at the human retina. There are several

ways to measure and characterize this spatiotemporal integration, via a direct measurement

or via an indirect measurement technique. For direct measurements a pursuit camera system

can be used, and the indirect measurement is based on measuring the temporal response

curves, and from those curves the motion induced object blur that will occur on the retina can

be calculated. Both direct and indirect measurements will be described in this document. In

addition to the characteristics of motion blur of two-dimensional (2D) LCD modules, there

exist influences from the 3D operation of the display device and the 3D glasses, which result

in a change in the perceived hold time. The direction of image motion is another factor to be

considered regarding the fact that the 3D image can be perceived to move in a 3D space –

not in a 2D plane. See Annex A for an example.
5.2 Direct measurement method
5.2.1 Standard measuring process
5.2.1.1 Test patterns

The test pattern shall be displayed to fill the entire screen to measure the motion blur of

stereoscopic 3D display modules. In order to preserve the horizontal resolution in the 3D

driving mode, the top/bottom or frame sequential test pattern shall be used. In order to

prevent influences from the 3D crosstalk between the left-eye and the right-eye patterns, the

test pattern shall be located in the left-eye pattern while the right-eye pattern shall be a black

screen (see Figure 1). The details of the test pattern(s) used shall be reported. When using a

pursuit system, the width of the test pattern should be sufficiently wide, for example 5 times

the advancement (step-width) per frame, to capture the total temporal response of the display.

It is recommended that a minimum of seven equally divided gray levels, including black and

white, be used for the gray level of each part of a test pattern in Figure 1. The lightness

function, specified in CIE 1976 (L*u*v*) and CIE 1976 (L*a*b*) colour spaces, can be used to

space the intermediate gray shades equally on the lightness scale. One of the gray level data

that are available at the LCD modules input, for example 0 to 255 for an 8-bit LCD module,

can also be used as this gray level. See Annex B for the line spreading method.
Figure 1 – Example of edge blur test pattern of top/bottom 3D format
---------------------- Page: 10 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 9 –
5.2.1.2 Pursuit detection system

Measurement of the edge blur of the LCD module should be done by using a CCD or CMOS

camera with the pursuit measurement system shown in Figure 2 and Figure 3. Relevant

literature on these systems can be found in the Bibliography, references [1] to [6] .

Figure 2 – Example of pivoting pursuit camera system
Figure 3 – Example of linear pursuit camera system

The following elements are recommended when implementing the pursuit measuring system:

___________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 11 ----------------------
– 10 – IEC 62629-12-2:2019  IEC 2019

a) LMD: CCD or CMOS type surface measurement devices, with preferably an integrated CIE

1931 photopic luminous sensitivity function (measuring luminance).

b) Scroll speed: the scroll speed of the test pattern and the pursuing speed of the LMD shall

be synchronized to prevent integration errors.

c) Pursuing system: either the pivoting or linear pursuit system shown in Figure 2 and Figure

3, respectively. The angular rotation shall be limited to avoid viewing-angle and depth of

focus related dependencies (less than ± 5˚).

d) Location of the 3D glasses: if the LMD uses a scanning mirror and a fixed camera, the 3D

glasses shall be located between the scanning mirror and the lens.
5.2.1.3 Specified conditions
The specified conditions shall be as follows, and shall be reported:
a) Any deviations from the standard measurement conditions.

b) The signal level (the start level and the end level) for the test pattern is summarized in

Table 1.
Table 1 – Step response data for different luminance transitions
Data per colour End level
(e.g. R,G,B,W)
L L L .. .. L
1 2 3 N
L L (t) L (t) L (t)
1 1-2 1-3 1-N
L L (t) L (t) L (t)
2 2-1 2-3 2-N
L L (t) L (t) L (t)
3 3-1 3-2 3-N
L L (t) L (t) L (t)
N N-1 N-2 N-3
NOTE The gray levels are typically used.
c) Standard measuring conditions
1) Scroll speed (pixel/frame): 4, 8, 12.

2) Shutter speed of camera (in seconds): multiples of a single frame time, which means a

period of 1/R (R : video refresh rate) for a pair of left-eye patterns and right-eye

vf vf
patterns which are displayed.
d) Requirements for measuring set-up
1) Measuring distance

It is recommended to set a pursuing angle no larger than ±5° (as described in 5.2.1.2

c)) during the shutter speed. The measuring distance shall be set to satisfy the above

criterion of pursuing angle. Table 2 shows an example.
Table 2 – Example of measuring conditions
Size of display screen (diagonal, inch) 24
Pixel size (mm) 0,276
Scroll speed (pixel/frame) 8
Shutter speed of camera (frame) 4
Measuring distance (mm) 300
Pursuing angle (degrees) 1,7
Start level
---------------------- Page: 12 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 11 –
2) Measuring positions at screen
It is recommended to set the measuring positions at the centre of the screen. In

addition, the measuring positions can also be horizontally centred at the top and

bottom of the screen, provided that is included in the report.
5.2.1.4 Requirements for the measuring system
The measuring system shall have the following conditions:

a) The spectral sensitivity of the camera shall be adjusted to be fitted with a photopic vision

function by using an adjusting element such as an optical filter.
b) The camera shall be able to focus at the display screen.
c) The measuring device shall include an iris to adjust the sensitivity.

d) The measuring device shall be able to pursue the scrolled pattern smoothly (consistently

uniform pursuing velocity).

e) The measuring system shall be able to provide a cross-section of the luminance profile

from the captured images of the scrolled pattern using the pursuing operation.

f) The measuring system shall provide consistent results with the measuring conditions with

various scroll speeds of the pattern and various shutter speeds of the camera (various

multiples of 1/R ).
5.2.2 Analysis method
5.2.2.1 Blurred edge time

The time between the transitions from 10 % to 90 % in the luminance transition curve (see

Figure 4) is used to represent the blurred edge time. Other ranges, such as 40 % to 60 %, can

be used, but they shall be reported.

NOTE The relation between the motion blur and the shape of the luminance transition curve (see Figure 4) is still

not clear, because the actual curve shape is not so simple (i.e., overshoot, …).
Figure 4 – Example of luminance cross-section profile of a blurred edge with BET
---------------------- Page: 13 ----------------------
– 12 – IEC 62629-12-2:2019  IEC 2019
5.2.2.2 Extended blurred edge time

The extended blurred edge time is defined as 80 % of BET, which linearly extends BET to

the 0 % to 100 % levels (see Figure 5).

Figure 5 – Example of luminance cross-section profile of a blurred edge with EBET

NOTE The relation that EBET equals 80 % of BET can be used only if a BET from 10 % to 90 % in the luminance

transition curve has been used.
5.3 Indirect measurement method
5.3.1 General

The indirect measurement method adopted is the temporal step response measurement

method, which is based on the literature, indicated in the Bibliography, i.e., references [10] to

[16]. If the display does not have any spatial imaging processing, such as sharpening (spatial

high-pass filter), the indirect method can be used.
5.3.2 Measurement system

A schematic representation of the measurement set-up to measure the temporal step

response is shown in Figure 6.
---------------------- Page: 14 ----------------------
IEC 62629-12-2:2019  IEC 2019 – 13 –
Figure 6 – Set-up to measure the temporal step response

The measurement set-up, presented in Figure 6, comprises the following components:

– The DUT (1), which is the 3D display to be measured.
– A pat
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.