IEC 61747-6-3:2011

IEC 61747-6-3 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Liquid crystal display devices –
Part 6-3: Measuring methods for liquid crystal display modules – Motion artifact
measurement of active matrix liquid crystal display modules

Dispositifs d'affichage à cristaux liquides –
Partie 6-3: Méthodes de mesure pour les modules d'affichage à cristaux
liquides – Mesure de l'artefact de mouvement dans les modules d'affichage
à cristaux liquides à matrice active

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IEC 61747-6-3 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Liquid crystal display devices –
Part 6-3: Measuring methods for liquid crystal display modules – Motion artifact
measurement of active matrix liquid crystal display modules

Dispositifs d'affichage à cristaux liquides –
Partie 6-3: Méthodes de mesure pour les modules d'affichage à cristaux
liquides – Mesure de l'artefact de mouvement dans les modules d'affichage
à cristaux liquides à matrice active

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 31.120 ISBN 978-2-88912-586-9

– 2 – 61747-6-3  IEC:2011
CONTENTS
FOREWORD . 4

1 Scope . 6

2 Normative references . 6

3 Terms and definitions . 6

4 Abbreviations . 7

5 Standard measuring conditions . 7

5.1 Temperature, humidity and pressure conditions . 7

5.2 Illumination condition . 7
6 Standard motion-blur measuring methods . 8
6.1 General . 8
6.2 Direct measurement method . 8
6.2.1 Standard measuring process . 8
6.2.2 Test patterns . 8
6.2.3 Analysis method . 10
6.3 Indirect measurement method . 12
6.3.1 Temporal step response . 12
6.3.2 High speed camera . 15
7 Test report. 16
7.1 General . 16
7.2 Items to be reported . 16
7.2.1 Environmental conditions . 16
7.2.2 Display parameters . 16
7.2.3 Measuring method and conditions . 16
7.2.4 Analysis method . 16
Annex A (informative) Subjective test method . 18
Annex B (informative) Motion contrast degradation . 19
Annex C (informative) Dynamic modulation transfer function . 21
Bibliography . 23

Figure 1 – Examples of edge blur test pattern . 8
Figure 2 – Example of a pivoting pursuit camera system . 9

Figure 3 – Example of a linear pursuit camera system . 9
Figure 4 – Example of luminance cross section profile of blurred edge . 11
Figure 5 – Example of luminance cross section profile of blurred edge . 11
Figure 6 – PBET calculation . 12
Figure 7 – Set-up to measure the temporal step response . 13
Figure 8 – Example of a LC response time measurement . 14
Figure 9 – Example of a motion picture response curve derived from the response
measurement presented in Figure 8, and a convolution with a one frame wide window
function. 15
Figure 10 – Example of measurement data reporting . 17
Figure B.1 – Example of motion contrast degradation test pattern . 19
Figure B.2 – Example of motion contrast degradation due to line spreading . 20
Figure C.1 – Example of motion contrast degradation . 21

61747-6-3  IEC:2011 – 3 –
Figure C.2 – Example of DMTF properties for different motion speeds (V) . 22

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

– 4 – 61747-6-3  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 6-3: Measuring methods for liquid crystal display modules –

Motion artifact measurement of

active matrix liquid crystal display modules

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
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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 61747-6-3 has been prepared by IEC technical committee 110:
Flat panel display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/296/FDIS 110/313/RVD
Full information on the voting for the approval on this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

61747-6-3  IEC:2011 – 5 –
A list of all parts of the IEC 61747 series, under the general title Liquid crystal display devices,
can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until
the stability 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.
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.
– 6 – 61747-6-3  IEC:2011
LIQUID CRYSTAL DISPLAY DEVICES –

Part 6-3: Measuring methods for liquid crystal display modules –

Motion artifact measurement of

active matrix liquid crystal display modules

1 Scope
This part of IEC 61747 applies to transmissive type active matrix liquid crystal displays.
This standard defines general procedures for quality assessment related to the motion
performance of LCDs. It defines artifacts in the motion contents and methods for motion
artifact measurement.
NOTE Motion blur measurement methods and analysis methods introduced in this standard could not be universal
tools for all different LCD motion enhancement technologies due to its complexity. Users shall be notified of these
circumstances.
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 61747-6, Liquid crystal and solid-state display devices – Part 6: Measuring methods for
liquid crystal modules – Transmissive type
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
motion picture response curve
a curve, representing the convolution of the temporal step response with a moving window
function of 1-frame wide. It shows how the luminance is integrated over time during smooth
pursuit eye tracking and combines the effects of the LCD response time and the hold-type
characteristics of the device under test

3.2
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
NOTE The profile can be calculated from the motion picture response curve for any given motion speed.
3.3
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 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 liquid crystal cell in combination with the hold-type characteristics.

61747-6-3  IEC:2011 – 7 –
3.4
perceived blurred edge time
time-related equivalent of the perceived blurred edge width. The latter one is derived from the

motion induced edge profile by means of filtering the edge profile with the contrast sensitivity

function of the human eye
4 Abbreviations
For the purpose of this document, the following abbreviations apply.

BET blurred edge time
BEW blurred edge width
CCD charge-coupled device
CIE Commission Internationale de l’Eclairage (international commission on
illumination)
CMOS complimentary metal-oxide semiconductor
CSF contrast sensitivity function
DMTF dynamic modulation transfer function
DUT display under test
DVI digital visual interface
EBET extended blurred edge time
FFT fast Fourier transform
IEC International Electrotechnical Commission
ISO International Organization for Standardization
JND just noticeable difference
LCD liquid crystal display
LMD light measuring device
LVDS low-voltage differential signaling
MCD motion contrast degradation
MPRC motion picture response curve
MTF modulation transfer function
PBET perceived blurred edge time
PBEW perceived blurred edge width
TN-LCD twisted nematic liquid crystal display
VA-LCD vertically-aligned liquid crystal display
5 Standard measuring conditions
5.1 Temperature, humidity and pressure conditions
The standard environmental condition for the motion artifact measurement is (25 ± 3) °C for
temperature, 25 % to 85 % for relative humidity, and 86kPa to 106kPa for air pressure. All
visual inspection tests shall be tested in (25 ± 5) °C.
5.2 Illumination condition
The illuminance at the measuring spot of the DUT shall be below 1 lx (standard dark room
condition as defined in IEC 61747-6).

– 8 – 61747-6-3  IEC:2011
6 Standard motion-blur measuring methods

6.1 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 taken 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 standard.
6.2 Direct measurement method
6.2.1 Standard measuring process
6.2.2 Test patterns
There are several patterns that can be used to measure motion induced object blur, such as
full test pattern, box test pattern, and line bar test pattern (see Figure 1). The details of the
used test pattern(s) shall be reported. When using a pursuit system, the width of the test
pattern should be sufficiently wide, e.g. 5 time the advancement (step-width) per frame, to
capture the total temporal response of the display. It is recommended that a minimum of
seven gray shades, including black and white, are used for 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*) color spaces, can be used to space the intermediate gray shades equally on the
lightness scale. One of gray level data that are available at the LCD modules input, e.g. 0 to
255 for an 8-bit LCD module, also can be used as this gray level.
(A) Full test pattern (B) Box test pattern (C) Line bar test pattern

IEC  1605/11
Figure 1 – Examples of edge blur test pattern
6.2.2.1 Pursuit detection system
Measuring edge blur of the LCD module should be done by using CCD 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 [5].
___________
Figures in square brackets refer to the Bibliography.

61747-6-3  IEC:2011 – 9 –
Pursuing speed (v)
Moving pattern      LMD with pursuing system

scroll speed (v)
Captured image on CCD
IEC  1606/11
Figure 2 – Example of a pivoting pursuit camera system
LCD module
Moving test pattern
Linear pursuing LMD system
Captured image
IEC  1607/11
Figure 3 – Example of a linear pursuit camera system
The following guidelines are recommended when implementing the pursuit measuring system:
a) LMD: CCD or CMOS type surface measurement devices (CCD camera), with preferably an
integrated CIE 1931 photopic luminous sensitivity function (measuring luminance).
b) Scroll speed: the scroll speed of test pattern and the pursuing speed of LMD shall be
synchronized accurately to prevent integration errors.
c) Pursuing system: either pivoting or linear pursuit system shown in Figure 2 and Figure 3,
respectively. The angular rotation shall be limited to avoid viewing-angle related
dependencies (less than ±5˚).
– 10 – 61747-6-3  IEC:2011
6.2.2.2 Specified conditions
a) Any deviations from the standard measurement conditions shall be reported: “Full test

pattern” shown in Figure 1(A) shall be used as the test pattern for this test method. Other

test patterns, such as “Box test pattern” shown in Figure 1(B) or “Line bar test pattern”

shown in Figure 1(C), can be used additionally depending on the requirements. The used
patterns shall be reported.
NOTE When other test patterns other than the standard “Full test pattern” are used, special care should be taken

because the size of the pattern can alter the luminance level of some of the LCD modules equipped with automatic

luminance level control function, or some long tails of the blurred edge can fall on the adjacent edge causing

ambiguity in the data analysis.

b) The signal level (the start level and the end level) for the test pattern is summarized Table
1.
Table 1 – Step response data for different luminance transitions
Data per color 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
c) Standard measuring conditions
1) Scroll speed : 4, 8, 12 pixel/frame
2) Shutter speed of camera : 1/20 sec.
6.2.3 Analysis method
6.2.3.1 Blurred edge time
The time between the transition from 10 % to 90 % in the luminance transition curve (see
Figure 4) is used to represent blurred edge time. Other ranges, such as 40 % to 60 %, can be
used, but they shall be reported.

Start level
61747-6-3  IEC:2011 – 11 –
Luminance transition curve
1,4
1,2
1,0
90 %
0,8
0,6
0,4
0,2
10 %
0 5 10 15 20 25 30 35 40 45 50
Time  (ms)
IEC  1608/11
Figure 4 – Example of luminance cross section profile of blurred edge
6.2.3.2 Extended blurred edge time
The extended blurred edge time is defined as EBET = BET/0.8, which linearly extends the
BET to the 0 % to 100 % levels (see Figure 5).

Luminance transition curve
1,4
1,2
100 %
1,0
90 %
0,8
0,6
0 % - 100 %
0,4
0,2
10 %
0 %
0 5 10 15 20 25 30 35 40 45 50
Time  (ms)
IEC  1609/11
Figure 5 – Example of luminance cross-section profile of blurred edge
6.2.3.3 Perceived blurred edge time
The process to obtain a PBET curve is described in bibliographic reference [6], and
summarized in Figure 6. Luminance blurred edge is converted to a spectrum by a fast Fourier
transformation (FFT). The spectrum is multiplied by values given by CSF. After then a PBET
Relative luminance intensity
Relative luminance intensity
– 12 – 61747-6-3  IEC:2011
curve is obtained by an inverse FFT. The value of the PBET is the distance between the

peaks of PBET curve (expressed in ms).

CSF PBEW PBET
Luminance profile
Inverse
Fourier Transform
Spatial Spatial
Time
CCD pixel Fourier Width
transform
frequency frequency
transform
IEC  1610/11
Figure 6 – PBET calculation
NOTE This standard recommends Peter Barten’s CSF (reference [7]), although other CSFs could be used.
2 2 2
−2π σ u
1 e / k
S(u) = =
Barten’s CSF formulae:
m (u)
t
  
 Φ
2 1 1 u 1
 

+ +  +

2 2 2 
  −(u/ u )
T ηpE 0
X X N

1− e 
 0 max max 
where
S(u)  is the spatial contrast sensitivity function for binocular vision;
m (u) is the modulation threshold;
t
u  is the spatial frequency;
σ  is the standard deviation of the line-spread function of the eye ;
K  is the signal-to-noise ratio (3,0);
T  is the integration time of the eye (0,1 s);
X  is the angular size of the object;
O
X  is the maximum angular filed size of the object (12˚);
max
N  is the maximum number of cycles over which the eye can integrate (15 cycles);
max
η  is the quantum efficiency of the eye (0,03);
p  is the photon conversion factor, depending on the light source
(e.g. 1,2 10 photons/sec/deg2/Td) ;

E  is the retinal illumination (Td);
-8 2
Φ  is the spectral density of the neural noise (3,10 sec deg );
U is the spatial frequency above which the lateral inhibition ceases (7
o
cycles/degree).
For the calculations, the viewing distance is set to 1.5 times the diagonal screen size of the
active display area (approximately 3 x height of display active area)
6.3 Indirect measurement method
6.3.1 Temporal step response
The temporal step response measurement method is based on the literature, indicated in the
Bibliography, i.e., references [9] to [15].
Relative luminance
Sensitivity
Relative stimuli
Relative stimuli
61747-6-3  IEC:2011 – 13 –
6.3.1.1 Measurement system
A schematic representation of the measurement set-up to measure the temporal step

response is shown in Figure 7.

1) DUT
4) Amplifier v(t) 5) Data
acquisition
3) Photo
Trigger
diode
Data transfer
LVDS/DVI 2) Pattern Control Monitor
generator
6) Luminance 7) Control
meter   system
L,x,y transfer
IEC  1611/11
Figure 7 – Set-up to measure the temporal step response
The measurement set-up, presented in Figure 7, comprises of the following components:
The DUT (1), which is the display to be measured.
A pattern generator (2), which generates the test patterns in the native display resolution and
applicable refresh rates. The pattern generator, preferably, has a control terminal or interface,
which enables selection of the pattern and start-stop of the measurement procedure. The
output of the pattern generator may consist of one or more LVDS, DVI, or other output
terminal(s), which can be connected with the display input terminal(s). The pattern generator
should also include a trigger output signal that can be used to start the data acquisition
process.
A fast response photo-diode or other opto-electrical detector (3), with a spectral sensitivity
that is matched to the spectral luminous efficiency function V(λ) for photopic vision. This
detector is used to capture the temporal luminance, produced by the DUT.

A signal amplifier (4), which is used for signal amplification to match the input range of data
acquisition device, and for low-pass filtering to attenuate the signal noise.
A data acquisition device (5) that records the amplified signal v(t) of the photo-diode. The
sampling rate shall be at least 10 kHz to enable acquiring temporal luminance data with
sufficient temporal resolution, and furthermore the sampling rate should be related to the
refresh rate of the display to allow time accurate analysis of the data. An oscilloscope or a
data-acquisition card can be used to acquire and digitize the time-varying luminance signal.
A luminance meter (6) that records the luminance of the display for each input code (0 to 255
for an 8-bit input signal). With this information the time varying photo-diode signal v(t) can be
translated to a time varying luminance signal L(t) = f(v(t)).
A control system (7), e.g. a personal computer, which can be used to start the measurement
procedure, and to collect and process all data.

– 14 – 61747-6-3  IEC:2011
6.3.1.2 Measurement process
In liquid crystal displays the temporal luminance transition from one level to another depends

on the selected input codes. The time required for the transition to be completed has an

influence on the perceived motion blur, and therefore several luminance transitions need to be

measured. The number of luminance transition levels should be at least seven, and they
should be spaced equidistant on the CIE1976 lightness scale. In order to determine the

appropriate luminance levels, first the luminance transfer function of the DUT should be

measured.
The pattern generator should generate images with grey-level values ranging from 0 to 255

(for an 8-bit display), and the corresponding luminance levels should be measured with the

luminance meter. At about the same screen position, the photo-diode (3) signal should be
measured in parallel to enable conversion from the time-varying voltage values to luminance
values. Next the (seven) luminance levels will be used as start and end levels to measure the
temporal step responses of the DUT. In this case the pattern generator will generate the
luminance transitions, which will be recorded with the data acquisition device (5) via the
photo-diode, amplifier combination.
Multiple traces can be acquired with the control system (7) to enable temporal averaging of
the step responses. Furthermore, to assure accurate and stable start- and end-levels, the
step response should comprise of six frames with the start-level and at least six frames with
the end-level. Of course it is also possible and allowed to record the rising and falling
luminance transitions in one pass. The measurements can be summarized with the following
table, where each cell in the table consists of an array with the temporal luminance data. To
enable analyzing motion related color artifacts, tables are required for each primary color as
well as for white (see Table 1).
6.3.1.3 Data analysis
6.3.1.3.1 Motion picture response curve
From the temporal step response, the motion picture response curve shall be calculated for
each transition and each primary color. This is done with a simple convolution of the step
response with a moving window function of 1-frametime wide (see for instance [12]). An
example of the convolution process is depicted in Figure 8, and the result is depicted in
Figure 9.
LC response time and window function: transition 0 -> 255 -> 0
0,8
0,6
0,4
0,2
0 0,05 0,1 0,15 0,2 0,25
Time  (s) IEC  1612/11
Figure 8 – Example of a LC response time measurement

Normalized luminance
61747-6-3  IEC:2011 – 15 –
MPRC: transition 0 -> 255 -> 0

0,8
0,6
0,4
0,2
0 0,05 0,1 0,15 0,2 0,25
Time  (s)
IEC  1613/11
Figure 9 – Example of a motion picture response curve
derived from the response measurement presented in Figure 8,
and a convolution with a one frame wide window function
6.3.1.3.2 Motion Induced edge profile
From the motion picture response curves, the edge profiles can be derived for any given
object speed. First the motion picture response curves shall be converted from the temporal
to the spatial domain with using the relation x = -ν.τ / T , in which x is the position of the
r f r
display pixel, projected on the retina, τ is time, T is the frame time, and ν is the motion speed
f
expressed in pixels per frame (the minus sign indicates motion from left to right). For each
luminance transition, the edge blur profile linearly scales with the motion speed. The higher
the motion speed the less pronounced the luminance transition of the edge will be. The
visibility of the edge blur depends on the relation between display pixel size and viewing
distance, but also the luminance contrast and the edge profile have an effect on the perceived
edge blur. The edge profile currently is sufficient as a measure for the motion performance,
because the relation between the perceived sharpness and the edge blur is only established
for continuous backlight type LCDs (see e.g. [13]). For these LCD-types, the BET, EBET,
and/or PBET can be derived according to 6.2.3.
6.3.2 High speed camera
The movement of the visual target is recorded by many individual images taken during one
frame period of the display (i.e. oversampling) followed by numerical processing of the images
to realize a pursuit of the target and evaluation of the corresponding blur characteristics.
When a moving block target is used as test-pattern, the block-width (w) should be several

times the advancement (step-width) per frame, ∆ (e.g. w=5·∆) in order to allow the optical
response to settle to a steady state which then serves as reference level for the evaluations
(100 % or 0 % level). Under this condition the step-response of the display under test is
measured. It must be assured that the optical response of the display under test (DUT) is
sampled with a sufficient number of images per frame-period.
Characteristics for the width of the blurred edges can be obtained e.g. by the distance
between the 10 % and 90 % luminance levels (BEW) for both rising and falling edge.
The optical transitions should be classified according to the underlying electrical driving
conditions (i.e. increasing or decreasing voltage, ON and OFF respectively) rather than by the
slope of the optical response to avoid confusion (a normally-black VA-LCD is activated to turn
bright, a normally white TN-LCD is activated to turn dark).
Normalized luminance
– 16 – 61747-6-3  IEC:2011
7 Test report
7.1 General
Test results shall be reported in conjunction with the test method, the measurement

conditions, and the analysis method(s).

7.2 Items to be reported
In the report, at least the following items shall be described.

7.2.1 Environmental conditions
• Temperature, humidity, and atmospheric pressure
• Illumination level
• Other conditions which are different from the standard measuring conditions (Clause 5)
7.2.2 Display parameters
• Refresh rate
• Native display resolution
• Backlight driving (impulse, stationary, blinking, scanning, other)
• Minimum and peak luminance
• Display gamma function (sometimes referred to as electro-optical transfer function).
• Display settings (if applicable)
• Drive mode (when optional driving mode, e.g. “over drive” are installed in the module,
the driving mode used for the test shall be reported).
NOTE Driving mode could interfere with experimental results.
7.2.3 Measuring method and conditions
• Measuring device (pursuit detection system, temporal step response, high speed
camera)
• Number of bits in the measuring device, used to capture the luminance signal
• For imaging devices, the number of CCD pixels per display pixel, the diaphragm, the
dynamic range, and the exposure time
• For pursuit systems, the synchronization accuracy
• Light measuring device (luminance meter, color analyzer, spectroradiometer, other)

• Scroll speed(s) (ex. 8 pixels/frame)
• Gray levels (start levels and end levels, see Table 1)
• Test pattern(s) details
• Other measuring conditions, such as shutter speed of the camera, frame frequency,
etc.
7.2.4 Analysis method
• Parameter (EBET, BET, PBET)
• Threshold for EBET or BET calculation, e.g. 10% to 90%
• Type of CSF and the CSF parameters for PBET calculation
An example for visually reporting the PBET analysis data is shown in Figure 10.

61747-6-3  IEC:2011 – 17 –
PBET (ms)
PBET
(ms)
Average
End
Standard dev Start
gray
Maximum gray
Minimum
IEC  1614/11
Figure 10 – Example of measurement data reporting

– 18 – 61747-6-3  IEC:2011
Annex A
(informative)
Subjective test method
It operates on a pair of images (test and reference), one of which may be a uniform field. The

images are defined as digital grayscale images, with an arbitrary size in pixels but subtending

2 degrees or less. Larger images can be handled with suitable extensions to the metric. The
images are assumed to be viewed at a specific viewing distance, and the pixels have a known

relation to luminance. The output of the metric is a measure of the visibility of the difference

between test and reference images, in units of just-noticeable difference (JND).

61747-6-3  IEC:2011 – 19 –
Annex B
(informative)
Motion contrast degradation
B.1 General
Line spreading is a method to evaluate motion blur magnitude plus contrast degradation as a

function of speed, both within a single measurement. It is more efficient and simplified than

dual edge methods such as for Moving-Edge or Box Edge Blur. It can provide meaningful
results for understanding motion performance of a display. The width and amplitude or
luminance of the spreading line is measured.
B.2 Direct measurement
Measurement method is the same as edge blurring method except the test pattern (see [8]).
Since this method is targeted to measure moving line spreading, narrow vertical line pattern
should be used. The example of the test pattern is shown in Figure B.1.
Blackground gray Blackground gray
Moving direction
Line pattern width
IEC  1615/11
Figure B.1 – Example of motion contrast degradation test pattern
The motion contrast degradation (MCD) characteristics can be analyzed due to line spreading
measurement. An example of the result is shown in Figure B.2.

– 20 – 61747-6-3  IEC:2011
0,50
0,45
Line spreading of a white 2-pixel wide line
4 ppf moving at various speeds across a black
0,40
background derived with an motion blur

measurement system
0,35
0,30
0,25
10 ppf
0,20
14 ppf
0,15
20 ppf
0,10
30 ppf
0,05
0 50 100 150 200 250 300 350 400 450 500
IEC  1616/11
Figure B.2 – Example of motion contrast degradation due to line spreading
B.3 Indirect measurement
To derive the luminance degradation of a line the same measurement system and process
can be used as described in 6.3.1. In this case the number of frames with the line luminance
shall be identical to the line width. From the motion picture response curves the line
spreading can be calculated for any desired motion speed.

Luminance level
61747-6-3  IEC:2011 – 21 –
Annex C
(informative)
Dynamic modulation transfer function

Dynamic modulation transfer function (DMTF) is introduced to characterize the display

performance when rendering motion images. DMTF presents the resolving power of a display

at different spatial frequency components for specific motion speeds. The calculation of DMTF
is based on the captured temporal luminance variation for special input code sequences,

which temporal characteristics translate, under the specific condition of smooth pursuit eye

tracking, to spatial effects. The spatiotemporal conversion is obtained by smooth pursuit eye
tracking and temporal light integration at the human retina (see [10] and 6.3.1). By modeling
the perceived performance of a moving sine wave pattern on the display and calculating the
subsequent contrast degradation, the DMTF property is derived:
DMTF(V,f) = A (V,f)/A ,
p i
where V is the motion speed of the pattern (in pixels per frame), f is the spatial frequency of
the pattern (in cycles per pixel), A is the perceived amplitude of the pattern during motion,
p
and A is the amplitude of the original input pattern (see Figure C.1). An example of resulting
i
DMTF calculations is presented in Figure C.2.
For more details on DMTF calculation, see e.g. [16].
I (n)
i
A
i
(X)
Position  (x)
t
Input pattern
t +1
t +2
t +3
Input sequence
Time  (t)
Simulated pattern
I (n)
p
A
p
(X′)
IEC  1617/11
Figure C.1 – Example of motion contrast degradation

X
X +4
X +8
– 22 – 61747-6-3  IEC:2011
1,0
V = 4 ppf
0,8
V = 16 ppf
0,6
V = 2 ppf
0,4
V = 8 ppf
0,2
0 0,1 0,2 0,3 0,4 0,5
Spatial frequency (cycle/pixel)
IEC  1618/11
Figure C.2 – Example of DMTF properties for different motion speeds (V)

DMTF
...