SIST EN 61966-6:2006

Multimedia systems and equipment - Colour measurement and management -- Part 6: Front projection displays

This part of IEC 61966 defines input test signals, measurement conditions, methods of measurement and reporting of the measured data, to be used for colour characterization and colour management of front projection displays in multimedia systems. Colour control within equipment is outside the scope of this part. It does not specify limiting values for various parameters.

Multimediasysteme und -geräte - Farbmessung und Farbmanagement -- Teil 6: Elektronische Projektoren für Aufprojektion

Systèmes et appareils multimédia - Mesure et gestion de la couleur -- Partie 6: Ecrans de projection frontale

Defines input test signals, measurement conditions, methods of measurement and reporting of the measured data, to be used for colour characterization and colour management of front projection displays in multimedia systems.

Večpredstavnostni sistemi in oprema – Merjenje in urejanje barv – 6. del: Prikazovalniki s frontalno projekcijo (IEC 61966-6:2005)

General Information

• Status: Published
• Publication Date: 30-Sep-2006
• ICS: 17.180.20 - Colours and measurement of light
• ICS: 33.160.60 - Multimedia systems and teleconferencing equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2006
• Due Date: 01-Oct-2006
• Completion Date: 01-Oct-2006
• Ref Project: EN 61966-6:2006 - Multimedia systems and equipment - Colour measurement and management - Part 6: Front projection displays

Standards Content (Sample)

SLOVENSKI SIST EN 61966-6:2006

STANDARD
oct 2006
Večpredstavnostni sistemi in oprema – Merjenje in upravljanje barv – 6. del:
Prikazovalniki s prednjo projekcijo
Multimedia systems and equipment – Colour measurement and management –
Part 6: Front projection displays
ICS 17.180.20; 33.160.60 Referenčna številka
SIST EN 61966-6:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD
EN 61966-6

NORME EUROPÉENNE
May 2006
EUROPÄISCHE NORM

ICS 33.160.60; 17.180.20


English version


Multimedia systems and equipment -
Colour measurement and management
Part 6: Front projection displays
(IEC 61966-6:2005)


Systèmes et appareils multimédia - Multimediasysteme und -geräte -
Mesure et gestion de la couleur Farbmessung und Farbmanagement
Partie 6: Ecrans de projection frontale Teil 6: Elektronische Projektoren für
(CEI 61966-6:2005) Aufprojektion
(IEC 61966-6:2005)




This European Standard was approved by CENELEC on 2006-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61966-6:2006 E

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EN 61966-6:2006 - 2 -

Foreword
The text of the International Standard IEC 61966-6:2005, prepared by IEC TC 100, Audio, video and
multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as
EN 61966-6 on 2006-03-01 without any modification.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-03-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-03-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61966-6:2005 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61966-2-1 NOTE  Harmonized as EN 61966-2-1:2000 (not modified).
IEC 61966-3 NOTE  Harmonized as EN 61966-3:2000 (not modified).
ISO 9241-8 NOTE  Harmonized as EN ISO 9241-8:1997 (not modified).

__________

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- 3 - EN 61966-6:2006

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-845 1987 International Electrotechnical Vocabulary - -
(IEV)
Chapter 845: Lighting


IEC 61947 Series Electronic projection - Measurement and EN 61947 Series
documentation of key performance criteria


ISO/CIE 10527 1991 CIE standard colorimetric observers - -


CIE 15.2 1986 Colorimetry - -

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INTERNATIONAL IEC


STANDARD 61966-6



First edition
2005-03

Multimedia systems and equipment –
Colour measurement and management –
Part 6:
Front projection displays
Reference number
IEC 61966-6:2005(E)

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Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
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Information on the subjects under consideration and work in progress undertaken
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INTERNATIONAL IEC


STANDARD 61966-6





First edition
2005-03


Multimedia systems and equipment –
Colour measurement and management –
Part 6:
Front projection displays
 IEC 2005  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
U
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

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– 2 – 61966-6  IEC(E)
CONTENTS

FOREWORD.4
INTRODUCTION.6
1 Scope .7
2 Normative references .7
3 Terms and definitions .7
4 Letters and symbols .8
5 Conditions.9
5.1 Environmental conditions .9
5.2 Conditions for measurements.9
5.3 Input digital data.11
6 Measurement equipment.11
6.1 Spectroradiometer .11
6.2 Colorimeter .12
7 Spectral characteristics and intensity of the primaries and white .12
7.1 Characteristics to be measured.12
7.2 Measurement conditions .12
7.3 Method of measurement .13
7.4 Presentation of results.13
8 Basic colorimetric characteristics .14
8.1 Characteristics to be measured.14
8.2 Method of measurement .14
8.3 Presentation of results.15
9 Tone characteristics .15
9.1 Characteristics to be measured.15
9.2 Measurement conditions .15
9.3 Method of measurement .16
9.4 Presentation of results.16
10 Other characteristics.19
10.1 Inter-channel dependency.19
10.1.1 Characteristics to be measured .19
10.1.2 Measurement conditions .20
10.1.3 Method of measurement.20
10.1.4 Presentation of results .22
10.2 Spatial non-uniformity.23
10.2.1 Characteristics to be measured .23
10.2.2 Measurement conditions .23
10.2.3 Method of measurement.23
10.2.4 Presentation of results .27

Bibliography .30

Figure 1 – Equipment arrangement for measurements (side view).10
Figure 2 – Size of colour patch.10

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61966-6  IEC(E) – 3 –
Figure 3 – Example of the spectral radiance distributions r(λ), g(λ),b(λ) .13
Figure 4 – Measured points and interpolated curves .17

Figure 5 – Measurement points for spatial non-uniformity (25 points) .23
Figure 6 – Measurement points for spatial non-uniformity (9points) .25
Figure 7 – Measurement points for spatial non-uniformity (13 points) .26

Table 1 – Input data for peak primaries and peak white .13
Table 2 – Example of reporting form for colours in maximum excitations .14
Table 3 – Example of reporting form.15
Table 4 – Example set of basic normalized data for tone characteristics.18
Table 5 – Digital driving levels to generate colour patches for measurement of
interchannel dependency .20
Table 6 – Example of normalized tristimulus values (matrix A) .22
Table 7 – Example of reporting form.28
Table 8 – Example of reporting form.28
Table 9 – Example of reporting form.29

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– 4 – 61966-6  IEC(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –

Part 6: Front projection displays

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 61966-6 has been prepared by technical area 2: Colour
measurement and management, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/835/CDV 100/915/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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61966-6  IEC(E) – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61966 consists of the following parts, under the general title Multimedia systems and
equipment – Colour measurement and management:
Part 1: General
Part 2-1: Colour management – Default RGB colour space – sRGB
Part 2-2: Colour management – Extended RGB colour space – scRGB
Part 3: Equipment using cathode ray tubes
Part 4: Equipment using liquid crystal display panels
Part 5: Equipment using plasma display panels
Part 6: Front projection displays
Part 7-1: Colour printers – Reflective prints – RGB inputs
Part 7-2: Colour printers - Reflective prints - CMYK inputs (under consideration)
Part 8: Multimedia colour scanners
Part 9: Digital cameras
Part 10: Quality assessment - Colour image in network systems (under consideration)
Part 11: Quality assessment - Impaired video in network systems (under consideration)
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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– 6 – 61966-6  IEC(E)
INTRODUCTION
The IEC 61966 series of standards defines methods and parameters for colour measurements
and colour management for use in multimedia systems and equipment, applicable to colour
production and reproduction. Part 6 deals with front projection displays.
The methods of measurement standardized in this part are designed to make possible the
objective characterization of colour reproduction of front projection displays which accept red-
green-blue analogue and/or digital signals from electrical input terminals and output light
corresponding to the intended colour. The measured results are intended to be used for the
purpose of equipment-specific colour control in order to attain colour management in open
multimedia systems and should generally be adequate for this purpose. However, in some
cases, it may be necessary to consider additional factors not addressed in this part of
IEC 61966, such as the actual environment in which the front projection display will be used,
to achieve the desired colour reproduction.
Readers of this standard are also encouraged to review IEC 61947-1 and IEC 61947-2, which
apply to the measurement and documentation of key performance criteria for multimedia
projectors.

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61966-6  IEC(E) – 7 –
MULTIMEDIA SYSTEMS AND EQUIPMENT –
COLOUR MEASUREMENT AND MANAGEMENT –

Part 6: Front projection displays



1 Scope
This part of IEC 61966 defines input test signals, measurement conditions, methods of
measurement and reporting of the measured data, to be used for colour characterization and
colour management of front projection displays in multimedia systems.
Colour control within equipment is outside the scope of this part. It does not specify limiting
values for various parameters.
2 Normative references
The following referenced documents are indispensable for the application 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 60050-845:1987, International Electrotechnical Vocabulary (IEV) – Chapter 845:
Lighting/CIE 17.4: 1987, International Lighting Vocabulary (Joint IEC/CIE publication)
IEC 61947 (all parts), Electronic projection – Measurement and documentation of key
performance criteria
ISO/CIE 10527:1991, CIE standard colorimetric observers
CIE 15.2:1986, Colorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-845 and CIE
17.4, as well as the following, apply.
3.1
background
data corresponding to an image surrounding the target colour patch to be measured
3.2
colour control
effort to convert equipment-dependent colour image data to equipment-independent data for a
specific colour space including tone characteristics
3.3
colour patch, test area
square colour image on a virtual screen of the front projection display subject to be measured
for colour reproduction, in which input data for the red, green and blue channels are kept
constant within the image area

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– 8 – 61966-6  IEC(E)
3.4
CRT
colorimetrically well-controlled equipment using cathode ray tubes to present colour images
with digital inputs for reference
3.5
effective screen height
vertical dimension of the effective screen area
3.6
effective screen area
area where a picture can be produced
3.7
normalized (image) signal
input signal normalized by its full-scale value, whose level is of interest in calculation and
evaluation of colour control function within front projection display (see also equation (1) in
5.3)
3.8
uncertainty (of measurement)
parameter, associated with the result of a measurement, that characterizes the dispersion of
the values that could reasonably be attributed to the particular quantity subject to
measurement (see also the IEC Guide to the expression of uncertainty in measurement,1995)
3.9
virtual screen
perfect reflecting diffuser-to-image input data
4 Letters and symbols
The notations consistently adopted in this part of IEC 61966 are summarized below.
A display area ratio
N number of bits in digital data for each channel
N
M maximum integer for non-negative N -bits system; M = 2 −1
D digital data applied for red channel
R
D digital data applied for green channel
G
D digital data applied for blue channel
B
R normalized input level to red channel
G normalized input level to green channel
B normalized input level to blue channel
X one of measured raw data using spectroradiometers and colorimeters corresponding
to tristimulus values
Y one of measured raw data using spectroradiometers and colorimeters corresponding
to tristimulus values in candela per square metre
Z one of measured raw data using spectroradiometers and colorimeters corresponding
to tristimulus values
′
R linearized data for red channel taking into account the tone characteristics of the
channel

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61966-6  IEC(E) – 9 –
G′ linearized data for green channel taking into account the tone characteristics of the
channel
′
B linearized data for blue channel taking into account the tone characteristics of the
channel
′
X one of the tristimulus values normalized by Y (candela per square metre) for peak
n
white
′
Y one of the tristimulus values normalized by Y (candela per square metre) for peak
n
white
′ Y
Z one of the tristimulus values normalized by (candela per square metre) for peak
n
white
5 Conditions
5.1 Environmental conditions
All measurements specified in this document shall be carried out in a dark room. Particular
attention should be paid to prevent reflected illumination caused by the ambient objects
(desktop, wall, etc.) and direct illumination from light-emitting indicators of measuring
instruments.
An hour warm-up time should precede this measurement, if not specified by the manufacturer
of the equipment.
The mains voltage and frequency shall be at the rated value specified by the manufacturer. If
the mains voltage fluctuates, a regulated power supply shall be used to maintain the supply
voltage to within ±5 % of the rated value.
Other environmental conditions such as room temperature and relative humidity shall be
reported together with the results of measurements.
If additional environmental conditions are described in the manufacturer’s specifications,
these should be taken into account.
5.2 Conditions for measurements
Contrast, brightness and additional adjustments shall be set to the preset positions specified
by the manufacturer. If the adjustment is set to another position than the preset, the position
or corresponding value shall be reported with the results of measurements.
Geometrical adjustment shall be set to default position.
The arrangement of equipment for measurements shall be as shown in Figure 1. It incorporates
a spectroradiometer or a non-contact colorimeter, depending on the characteristics to be
measured.
The diagonal image size on the screen shall be set to the preset size specified by the
manufacturer. If no size is specified, it shall be set to 102 cm.
The height of front projection display (H) and the distance between the screen and the head
of the front projection display (L) shall be set to the preset positions specified by the
manufacturer. They depend on the screen size.

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– 10 – 61966-6  IEC(E)


1
2
4
h
3
H
L
d
IEC  458/05

Key
1 Screen d Distance between screen and measuring instrument
2 Perfect reflecting diffuser
h Effective screen height
3 Front projection display
H Height projected image
4 Spectroradiometer or colorimeter
L Distance from the screen
Figure 1 – Equipment arrangement for measurements (side view
The instrument optical axis should be perpendicular to the screen. If another measurement
angle is recommended by the manufacturer, it shall be reported together with the results of
measurements. The distance d shall be 4h < d < 5,5h .
A perfect reflecting diffuser shall be set on the centre of effective screen area.
The measured light shall be that reflected by a perfect reflecting diffuser.
Test signals applied to the red, green, and blue channels shall result in a colour patch of the
size shown in Figure 2 on the screen. The positioning of the colour patch shall be referred to
by the centre as in Figure 2. The background shall be black ( D = 0 , D = 0 , D = 0 ), unless
R G B
otherwise specified.

Centre
h/5
h/5
IEC  459/05

NOTE In the case where the appropriate relationship is confirmed, it is acceptable to measure luminous intensity
direct instead of using the perfect reflecting diffuser.
Figure 2 – Size of colour patch

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61966-6  IEC(E) – 11 –
5.3 Input digital data
The relationship between the input digital data, D , D , D of N bits per channel and
R G B
corresponding normalized signal levels R , G , B for calculations shall be
D 
R
i
R =

i
N
2 − 1

D
G

i
G = (1)

i
N
2 − 1


D
B
i

B =
i
N

2 − 1

where the index i denotes the i th measurement step.
NOTE When the input signal is applicable in analogue voltage, the signal level normalized by the maximum input
voltage should correspond to the signal level for each step defined in equation (1).
6 Measurement equipment
6.1 Spectroradiometer
A spectroradiometer with the following specification should be used for measurements.
a) Wavelength range at least 380 nm to 780 nm
b) Field of view between 0,1° and 2,0°
c) Wavelength uncertainty less than 0,5 nm at wavelengths specified by the
manufacturer of the instrument
d) Scanning interval 5 nm or less
e) Bandpass 5 nm or less
f) Repeatability 0,001 in x , y and 0,5 % in luminance (in candela per
square metre) for the light source specified by the
manufacturer of instrument
g) Uncertainty 0,005 in x , y for r
...