ISO/IEC 15938-3:2002/Amd 1:2004

Information technology — Multimedia content description interface — Part 3: Visual — Amendment 1: Visual extensions

Technologies de l'information — Interface de description du contenu multimédia — Partie 3: Visuel — Amendement 1: Extensions visuelles

General Information

• Status: Published
• Publication Date: 27-Jul-2004
• ICS: 35.040 - Information coding
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 6060 - International Standard published
• Start Date: 30-Dec-2003
• Due Date: 30-Jul-2004
• Completion Date: 28-Jul-2004

Relations

• Child: ISO/IEC 15938-3:2002 - Information technology — Multimedia content description interface — Part 3: Visual
• Effective Date: 15-Apr-2008
• Amends: ISO/IEC 15938-3:2002 - Information technology — Multimedia content description interface — Part 3: Visual
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 15938-3
First edition
2002-06-20
AMENDMENT 1
2004-08-01


Information technology — Multimedia
content description interface —
Part 3:
Visual
AMENDMENT 1: Visual extensions
Technologies de l'information — Interface de description du contenu
multimédia —
Partie 3: Visuel
AMENDEMENT 1: Extensions visuelles





Reference number
ISO/IEC 15938-3:2002/Amd.1:2004(E)
©
ISO/IEC 2004

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
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ii © ISO/IEC 2004 – All rights reserved

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to ISO/IEC 15938-3:2002 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information.
© ISO/IEC 2004 — All rights reserved iii

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
Introduction
This document specifies the first Amendment to the Visual part of the ISO/IEC 15938 standard. The normative
syntax of the Visual description tools is specified in this document using the Description Definition Language
(DDL) and the normative semantics is specified using text.
The current set of relevant documents for the Visual description tools is given as follows:
ISO/IEC 15938-3 – Visual
ISO/IEC 15938-3/Amd.1 – Visual extensions
ISO/IEC TR 15938-8 – Extraction and use of MPEG-7 descriptions
ISO/IEC TR 15938-8/Amd.1 – Extensions of extraction and use of MPEG-7 descriptions
iv © ISO/IEC 2004 — All rights reserved

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
Information technology — Multimedia content description
interface —
Part 3:
Visual
AMENDMENT 1: Visual extensions
Replace subclause 1.2 with:
1.2. Overview of Visual Description Tools
This part of ISO/IEC 15938 specifies tools for description of visual content, including still images, video and
3D models. These tools are defined by their syntax in DDL and binary representations and semantics
associated with the syntactic elements. They enable description of the visual features of the visual material,
such as color, texture, shape and motion, as well as localization of the described objects in the image or video
sequence. An overview of the visual description tools is shown in Figure 1.
The basic structure description tools include five supporting tools of visual descriptions defined in clauses 6-11.
They are categorized into two groups, descriptor containers and basic supporting tools. The former consists of
three datatypes, GridLayout providing efficient representations of visual features on grids, TimeSeries
representing temporal arrays of several descriptions, GofGopFeature describes representative descriptions
over video segment, and MultipleView describing a 3D object using several pictures captured from different
view angles. The latter contains two tools, Spatial2DcoordinateSystem used to specify the 2D coordinate
system and TemporalInterpolation indicating the interpolation method between two samples on a time axis.
The remaining description tools, except for the FaceRecognition descriptor, are associated with visual
features and are grouped into five feature categories: Color, Texture, Shape, Motion and Localization.
The color description tools include five color descriptors to represent different aspects of color features:
representative colors (DominantColor), color distribution (ScalableColor), spatial distribution of colors
(ColorLayout and ColorStructure) and perceptual feeling of illumination color (ColorTemperature). It also
contains three supporting tools, ColorSpace and ColorQuantization used in DominantColor and
IlluminationInvariantColor to extend four color descriptors, DominantColor, ScalableColor, ColorLayout and
ColorStructure, to support illumination invariant similarity matching. An extension of ScalableColor to a group
of frames or pictures (GoFGoPColor) is also included in this group. All the color descriptors can be extracted
from arbitrarily shaped regions.
The texture description tools facilitate browsing (TextureBrowsing) and similarity retrieval
(HomogeneousTexture and EdgeHistogram) using the texture of a still or moving image region. All the texture
descriptors can be extracted from arbitrarily shaped regions.
The shape description tools include two descriptors that characterize different shape features of a 2D object or
region. The RegionShape descriptor captures the distribution of all pixels within a region and the Contour
Shape descriptor characterizes the shape properties of the contour of an object. The extension of
RegionShape is also defined as ShapeVariation to describe temporal variation of shape over video segment.
The Shape3D descriptor provides an intrinsic shape characterization of 3D mesh models.
The motion description tools include four descriptors that characterize various aspects of motion. The
CameraMotion descriptor specifies a set of basic camera operations such as, for example, panning and tilting.
The motion of a key point (pixel) from a moving object or region can be characterized by the MotionTrajectory
descriptor. The ParametricMotion descriptor characterizes an evolution of an arbitrarily shaped region over
time in terms of a 2D geometric transformation. Finally, the MotionActivity descriptor captures the pace of the
motion in the sequence, as perceived by the viewer. All motion descriptors except for CameraMotion can be
extracted from arbitrarily shaped regions.
The localization description tools can be used to indicate regions of interest in the spatial (RegionLocator) and
spatio-temporal (SpatioTemporalLocator) domains.
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
The FaceRecognition descriptor and the Advance Face Recognition descriptor are not associated with any
particular visual feature and can be used to describe a human face for applications requiring the matching and
retrieval of face images.
Basic Structures
Descriptor Containers Basic Supporting Tools
GridLayout
TemporalInterpolation
TimeSeries
Spatial2DcoordinateSystem
GofGopFeature
MultipleView
Visual Features
Color
Color Feature Descriptors
Color Supporting Tools
DominantColor ColorSpace
ScalableColor ColorQuantization
IlluminationInvariantColor
ColorLayout
ColorStructure
GofGopColor
ColorTemperature
Texture Shape Motion
HomogeneousTexture RegionShape CameraMotion
TextureBrowsing ContourShape MotionTrajectory
EdgeHistogram ParametricMotion
ShapeVariation
MotionActivity
Shape3D
Localization
RegionLocator
SpatioTemporalLocator
Other
FaceRecognition
AdvancedFaceRecognition
Figure 1 - Overview of Visual Description Tools
Extend the definitions in subclause 3.2:
NSVM Negative Shape Variation Map
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
SVM Shape Variation Map
LDA  Linear Discriminant Analysis
PCA Principal Component Analysis
PCLDA Linear Discriminant Analysis of Principal Components
MIRED MIcro REciprol Degree
Extend the definitions in subclause 3.3:
ƒe>@z
z
 Real part of a complex value
‚m>@z
z
 Imaginary part of a complex value
Replace subclause 4.2.2 with:
4.2.2 Generic binary representation
The use of the video-specific syntax is signaled using the codec configuration mechanism defined in ISO/IEC 15938-1 and
the following classification scheme is defined for this purpose.


 MPEG7CameraMotion
 ISO/IEC 15938-3 Binary Camera Motion
  Codec


 MPEG7ColorLayout
 ISO/IEC 15938-3 Binary Color Layout
  Codec


 MPEG7ColorQuantization
 ISO/IEC 15938-3 Binary Color Quantization
  Codec


 MPEG7ColorSpace
 ISO/IEC 15938-3 Binary Color Space
  Codec


 MPEG7ColorStructure
 ISO/IEC 15938-3 Binary Color Structure
  Codec


 MPEG7ContourShape
 ISO/IEC 15938-3 Binary Contour Shape
  Codec
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ISO/IEC 15938-3:2002/Amd.1:2004(E)


 MPEG7DominantColor
 ISO/IEC 15938-3 Binary Dominant Color
  Codec


 MPEG7EdgeHistogram
 ISO/IEC 15938-3 Binary Edge Histogram
  Codec


 MPEG7FaceRecognition
 ISO/IEC 15938-3 Binary Face Recognition
  Codec


 MPEG7FoFGoPColor
 ISO/IEC 15938-3 Binary GoFGoP Color
  Codec


 MPEG7GridLayout
 ISO/IEC 15938-3 Binary Grid Layout
  Codec


 MPEG7HomogeneousTexture
 ISO/IEC 15938-3 Binary Homogeneous Texture
  Codec


 MPEG7IrregularVisualTimeSeries
 ISO/IEC 15938-3 Binary Irregular Time Series
  Codec


 MPEG7MotionActivity
 ISO/IEC 15938-3 Binary Motion Activity
  Codec


 MPEG7MotionTrajectory
 ISO/IEC 15938-3 Binary Motion Trajectory
  Codec


 MPEG7MultipleView
 ISO/IEC 15938-3 Binary Multiple View
  Codec


 MPEG7ParametricMotion
 ISO/IEC 15938-3 Binary Parametric Motion
  Codec


 MPEG7RegionLocator
 ISO/IEC 15938-3 Binary Region Locator
  Codec
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ISO/IEC 15938-3:2002/Amd.1:2004(E)


 MPEG7RegionShape
 ISO/IEC 15938-3 Binary Region Shape
  Codec


 MPEG7RegularVisualTimeSeries
 ISO/IEC 15938-3 Binary Regular Time Series
  Codec


 MPEG7ScalableColor
 ISO/IEC 15938-3 Binary Scalable Color
  Codec


 MPEG7Shape3D
 ISO/IEC 15938-3 Binary Shape 3D
  Codec


 MPEG7Spatial2DCoordinateSystem
 ISO/IEC 15938-3 Binary Spatial 2D Coordinate
  System Codec


 MPEG7SpatioTemporalLocator
 ISO/IEC 15938-3 Binary SpatioTemporal Locator
  Codec


 MPEG7TemporalInterpolation
 ISO/IEC 15938-3 Binary Temporal Interpolation
  Codec


 MPEG7TextureBrowsing
 ISO/IEC 15938-3 Binary Texture Browsing
  Codec


 MPEG7GofGopFeature
 ISO/IEC 15938-3 Binary Gof Gop Feature
Codec


 MPEG7ColorTemperature
 ISO/IEC 15938-3 Binary Color Temperature
Codec


 MPEG7ShapeVariation
 ISO/IEC 15938-3 Binary Shape Variation
Codec


 MPEG7IlluminationInvariantColor
 ISO/IEC 15938-3 Binary Illumination Invariant
Color Codec
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ISO/IEC 15938-3:2002/Amd.1:2004(E)


 MPEG7AdvancedFaceRecognition
 ISO/IEC 15938-3 Binary Advanced Face Recognition
Codec


Replace Table 1 in subclause 5.2.4 with:
Table 1 Assignment of IDs to descriptors
ID Descriptor
0 Forbidden
1 CameraMotion
2 ColorLayout
3 ColorSpace
4 ColorStructure
5 ColorQuantization
6 ContourShape
7 DominantColor
8 EdgeHistogram
9 FaceRecognition
10 GoFGoPColor
11 GridLayout
12 HomogeneousTexture
13 IrregularVisualTimeSeries
14 MotionActivity
15 MotionTrajectory
16 MultipleView
17 ParametricMotion
18 RegionLocator
19 RegionShape
20 RegularVisualTimeSeries
21 ScalableColor
22 Shape3D
23 Spatial2DCoordinateSystem
24 SpatioTemporalLocator
25 TemporalInterpolation
26 TextureBrowsing
27 GofGopFeature
28 ColorTemperature
29 ShapeVariation
30 IlluminationInvariantColor
31 AdvancedFaceRecognition
32-255 Reserved
Add after subclause 5.6:
5.7 GofGopFeature
5.7.1 Introduction
This container is a generic and extensible container to use several description tools defined in ISO/IEC 15938-
3 to describe the representative feature over Group of Frames (GoF)/Group of Pictures (GoP). For the use to
describe the transition of the feature through a video frame, VisualTimeSeries is much preferable.
6 © ISO/IEC 2004 — All rights reserved

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
5.7.2 DDL representation syntax





 



 
 
 
 
 



5.7.3 Binary representation syntax
GofGopFeature { Number of bits Mnemonic
AggregationFlag 1 bsbf
if(AggregationFlag){
 AggregationType3 bsbf
}
DescriptorID 8 uimsbf
SizeOfDescriptor 8 uimsbf
Descriptor see subclauses 5 to 8 bsbf
}
5.7.4 Descriptor component semantics
DescriptorID
This field, which is only present in the binary representation, specifies a descriptor identifier. The descriptor
identifier indicates the descriptor type accommodated in this container. The assignment of IDs to the
descriptors is specified in Table 1 in subclause 5.2.4. The available value of this field is 2 for Color Layout, 7
for Dominant Color, 8 for Edge Histogram, and 12 for Homogeneous Texture. The other values are prohibited.
SizeOfDescriptor
This field, which is only present in the binary representation, specifies a size of following descriptor in bytes.
Descriptor
This element represents the elementary feature using several description tools defined in ISO/IEC 15938-3.
The applicable tools are Dominant Color, Color Layout, Edge Histogram and Homogeneous Texture which are
specified in subclause 6.4, 6.6, 7.4 and 7.2, respectively. The size of this element shall be a multiple of 8 bits,
and be equal to the value of SizeOfDescriptor element in bits. For the alignment of byte boundary, ‘0’ bits
should be staffed just after the Descriptor bitstream.
AggregationFlag
This field signals the presence of aggregation attribute. If it is set to “1”, the aggregation attribute is following.
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
aggregation
This optional field specifies the aggregation method to create representative feature from the ones extracted
from group of frames/pictures. The aggregation is performed over all the elementary descriptions of the group
of video frames or images. One of the three types of aggregation presented below is allowed. If the
aggregation is not explicitly specified, one of the allowed aggregation methods for the embeded descriptor is
used.
Average
The average aggregation means that each element of the Descriptor is computed by accumulating the
corresponding elements over group of frame/picture and subsequently normalizing each accumulated value
by the number of the frames/pictures.
Median
The median aggregation means that each element of the Descriptor is obtained by constructing the
ascending list of element values over the frame/picture, and assigning the median of this list to the
representative value.
SplitMerge
The SplitMerge aggregation is allowed to be used only for Dominant Color. When this method is used, the
descriptors are first extracted from all frames/pictures and then merged into a single descriptor consisting of
all representative color values (“Value” elements in subclause 6.3). The size of the resulting descriptor is
then brought down to the limit imposed by the syntax of DominantColor descriptor by iterative merging of
the closest dominant color “Value” elements, where closeness is defined by Euclidean distance in color
space. The values of the merged “Value” element fields are as follows:
w  w
1 2
W
N
wm∗+w∗m
1 122
M=
ww+
12

2
wv∗+w∗v w∗w∗()m−m
11 2 2 1 2 1 2
V=+
2
ww+
()ww+
12
12
Where W , M , and V are the values of the “Percentage”, “Index”, and “ColorVariance” fields of the
merged “Value” element, w , w , m , m , and v , v are the corresponding fields of the elements being
1 2 1 2 1 2
merged and N is the total number of frame/pictures. If SpatialCoherency field is used, it is simply averaged
over all frames/pictures.
Note, the use of some of the aggregation methods is prohibited. The applicable methods for each description
tool are specified using “Y” mark in Table Amd1-1.
Table Amd1-1 - Applicable Aggregation Methods
Description Tools Average Medium SplitMerge
Color Layout Y Y n/a
Edge Histogram Y Y n/a
Homogeneous Texture Y Y n/a
Dominant Color n/a n/a Y
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
In the binary description, the following mapping table is used
AggregationType Aggregation
000 Reserved
001 Average
010 Medium
011 SplitMerge
100-111 Reserved
Add after subclause 6.8:
6.9 Color Temperature
6.9.1 Introduction
This descriptor specifies the perceptual temperature feeling of illumination color in an image for browsing and
display preference control purposes. Four perceptual temperature browsing categories are provided; hot,
warm, moderate, and cool. Each category is used for browsing images based upon its perceptual meaning.
This descriptor can be used to control the display quality of images or videos to either warmer or cooler
direction so as to gratify user’s preference.
6.9.2 DDL representation syntax





 
 
  
  
   
   
   
   
   
   
  
  
  
 
 


6.9.3 Binary representation syntax
ColorTemperature {
Number of bits Mnemonic
2 bslbf
BrowsingCategory
SubRangeIndex 6 uimsbf
}
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
6.9.4 Descriptor component semantics
BrowsingCategory
This element specifies the category of perceptual temperature. The color temperature in the range from
1667K (Kelvin) to 25000K estimates the illumination color of an image. The temperture value out of this range
shall be clipped to the corresponding range boundary value. A color temperature value is rounded with the
first digit under the decimal pointto be an integer. This color temperature range is divided and mapped into the
4 corresponding categories as defined in Table Amd1-2. The mapping between binary representation and
semantics is also provided in Table Amd1-2.
Table Amd1-2- Semantics of the Browsing Category field
Browsing Category Semantics Temperature Range
00 Hot Temperature < 2251K
01 Warm
2251Kd Temperature < 4171K
10 Moderate
4171Kd Temperature < 8061K
11 Cool 8061Kd Temperature
SubrangeIndex
This element specifies the sub-range index inside each browsing category. The temperature range for each
-1
category is uniformly quantized into 64 sub-ranges in MIRED (M/K ). The color temperature range
corresponding to each subrangeindex is provided in Table Amd1-3. A color temperature value is rounded with
the first digit under the decimal point to be an integer.
Table Amd1-3 - SubrangeIndex and its color temperature range for each category
Index Hot Warm Moderate Cool
000000 [1667,1674) [2251,2267) [4171,4203) [8061,8147)
000001 [1674,1681) [2267,2284) [4203,4235) [8147,8235)
000010 [1681,1687) [2284,2301) [4235,4268) [8235,8325)
000011 [1687,1694) [2301,2318) [4268,4301) [8325,8417)
000100 [1694,1701) [2318,2335) [4301,4334) [8417,8512)
000101 [1701,1709) [2335,2352) [4334,4369) [8512,8608)
000110 [1709,1716) [2352,2370) [4369,4403) [8608,8706)
000111 [1716,1723) [2370,2388) [4403,4439) [8706,8807)
001000 [1723,1730) [2388,2407) [4439,4475) [8807,8910)
001001 [1730,1737) [2407,2425) [4475,4511) [8910,9015)
001010 [1737,1745) [2425,2444) [4511,4548) [9015,9123)
001011 [1745,1752) [2444,2464) [4548,4586) [9123,9234)
001100 [1752,1760) [2464,2483) [4586,4624) [9234,9347)
001101 [1760,1767) [2483,2503) [4624,4663) [9347,9464)
001110 [1767,1775) [2503,2523) [4663,4703) [9464,9583)
001111 [1775,1782) [2523,2544) [4703,4743) [9583,9705)
010000 [1782,1790) [2544,2564) [4743,4784) [9705,9830)
010001 [1790,1798) [2564,2586) [4784,4826) [9830,9959)
010010 [1798,1806) [2586,2607) [4826,4868) [9959,10091)
010011 [1806,1814) [2607,2629) [4868,4912) [10091,10226)
010100 [1814,1822) [2629,2651) [4912,4956) [10226,10366)
010101 [1822,1830) [2651,2674) [4956,5000) [10366,10509)
010110 [1830,1838) [2674,2697) [5000,5046) [10509,10656)
010111 [1838,1846) [2697,2720) [5046,5092) [10656,10807)
011000 [1846,1855) [2720,2744) [5092,5140) [10807,10962)
011001 [1855,1863) [2744,2769) [5140,5188) [10962,11123)
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ISO/IEC 15938-3:2002/Amd.1:2004(E)
011010 [1863,1872) [2769,2793) [5188,5237) [11123,11287)
011011 [1872,1880) [2793,2818) [5237,5287) [11287,11457)
011100 [1880,1889) [2818,2844) [5287,5338) [11457,11632)
011101 [1889,1897) [2844,2870) [5338,5390) [11632,11813)
011110 [1897,1906) [2870,2897) [5390,5443) [11813,11999)
011111 [1906,1915) [2897,2924) [5443,5497) [11999,12191)
100000 [1915,1924) [2924,2951) [5497,5552) [12191,12389)
100001 [1924,1933) [2951,2979) [5552,5609) [12389,12594)
100010 [1933,1942) [2979,3008) [5609,5666) [12594,12806)
100011 [1942,1951) [3008,3037) [5666,5725) [12806,13025)
100100 [1951,1961) [3037,3067) [5725,5785) [13025,13252)
100101 [1961,1970) [3067,3097) [5785,5846) [13252,13487)
100110 [1970,1980) [3097,3128) [5846,5908) [13487,13730)
100111 [1980,1989) [3128,3160) [5908,5972) [13730,13982)
101000 [1989,1999) [3160,3192) [5972,6037) [13982,14244)
101001 [1999,2009) [3192,3225) [6037,6104) [14244,14515)
101010 [2009,2018) [3225,3259) [6104,6172) [14515,14797)
101011 [2018,2028) [3259,3293) [6172,6241) [14797,15090)
101100 [2028,2038) [3293,3328) [6241,6313) [15090,15396)
101101 [2038,2049) [3328,3364) [6313,6385) [15396,15713)
101110 [2049,2059) [3364,3400) [6385,6460) [15713,16044)
101111 [2059,2069) [3400,3437) [6460,6536) [16044,16390)
110000 [2069,2080) [3437,3476) [6536,6615) [16390,16750)
110001 [2080,2090) [3476,3515) [6615,6695) [16750,17127)
110010 [2090,2101) [3515,3554) [6695,6777) [17127,17521)
110011 [2101,2112) [3554,3595) [6777,6861) [17521,17934)
110100 [2112,2122) [3595,3637) [6861,6947) [17934,18367)
110101 [2122,2133) [3637,3680) [6947,7035) [18367,18821)
110110 [2133,2145) [3680,3724) [7035,7126) [18821,19298)
110111 [2145,2156) [3724,3768) [7126,7219) [19298,19799)
111000 [2156,2167) [3768,3814) [7219,7314) [19799,20328)
111001 [2167,2179) [3814,3861) [7314,7412) [20328,20886)
111010 [2179,2190) [3861,3910) [7412,7513) [20886,21475)
111011 [2190,2202) [3910,3959) [7513,7616) [21475,22098)
111100 [2202,2214) [3959,4010) [7616,7722) [22098,22758)
111101 [2214,2226) [4010,4062) [7722,7832) [22758,23459)
111110 [2226,2238) [4062,4115) [7832,7944) [23459,24205)
111111 [2238,2251) [4115,4171) [7944,8061) [24205,25001)
6.10 Illumination Invariant Color
6.10.1 Introduction
This descriptor wraps the color descriptors in ISO/IEC 15938-3 that are Dominant Color, Scalable Color, Color
Layout, and Color Structure. Before extracting one of the DominantColor, ScalableColor, ColorLayout, and
ColorStructure from an image, the pixel values shall be converted using a tranformation which correspons to
changing the illumination to 6500K on the daylight locus.
© ISO/IEC 2004 — All rights reserved 11

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ISO/IEC 15938-3:2002/Amd.1:2004(E)
6.10.2 DDL representation synt
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