d8n135 minutes cie division 8 meeting 6 nov 2007 …cie division 8 meeting 6 nov 2007 officers...

CIE Division 8 Meeting 6 Nov 2007

Officers present:

Sabine Susstrunk (Div 8 Director), Nathan Moroney (Secretary), Ann McCarthy (Editor)

The Director introduced the new officers of Division 8 and then reviewed current TC work.

Slides for that material are attached.

Additional notes from TC discussion:

TC8-08: “Guidelines for testing HDR rendering”. Note that qualifying the display that will be

used to evaluate the images is critical to this work. If the display itself is limited then HDR

judgment will be impaired.

TC8-09: “Image Archiving”. Note: the committee should look at PDF/A which addresses some

of this.

TC8-10: “Office Lighting for Imaging”. Currently asking for volunteers to do spectral

measurements in various office locations around the world.

TC8-11: CIECAM02-Mathematics: Changjun Li (UK), newly created TC. Terms of reference:

to improve CIECAM02 model to avoid the mathematical inconsistencies; to enable CIECAM02

to work in colour management applications. Lunch Wed Nov 7 to continue the discussion.

Discussion:

1. The colours that are causing the issue are near the spectral locus. Some consider these

colours to have little practical importance. The correction needed is to clarify the

mathematics.

2. Perhaps these colours are important for next generation displays.

3. Part of the discussion in this TC will be to define the applicability of the CIECAM02

model (e.g., PCS, colour difference, spectral colours).

4. The McCann data set was discarded in making the current CIECAM02. It does not fit

well to the overall model. Perhaps that data set should be an indicator of the correction

that is needed.

5. There is debate regarding whether narrow band imaging is intended to be included in

CIECAM02. This TC would appreciate contributions of data sets of narrow band colours.

6. What is needed is canonical closed form method to handle all PCS CIELAB and

CIEXYZ colours in colour management systems.

7. Will the CIECAM02 correction be a mathematical modification within the current

structure, or will behavior need to be changed to address narrow band colour.

8. Perhaps the approach should be for a short term fix (tweak the mathematics) but also to

look at future needs for spectral imaging.

9. Tweaking the mathematics (CAT) will not address the issues of dealing with the full

range of PCS colours.

TC8-12: HVS-based quality assessment for video imaging

Includes dealing with different media and different viewing conditions – regarding how to

evaluate videos on different displays.

Liaison has been established with SC29/WG1. Recommended new liaison with IEC

TC100 TA11. May also need liaisons with I3A CPIQ and MIPC, if cell phones / mobile

devices are included.

Membership discussion:

Q: How does a person become a member of a TC?

A: Most committees have two lists, active contributors and observers. Simply send a note to the

TC Chair to be added to one of these lists. Also, any national committee (one of 40 countries)

can appoint a member to a committee. When the report is done, only the people who actively

contributed are listed.

Meetings and travel:

Note that TC meetings can be held anywhere, e.g., co-located with other meetings as appropriate

per the TC chair. Sabine plans to encourage co-location of the TCs with CIC. Div 8 annual

meeting will likely be located in EU to minimize travel cost for academics. Noted that each

Division can decide where to meet. CIE requirement is for each Division to meet at least once

per 4 years at the CIE Quadrennial meeting. The ICC will have one of its meetings with the CIC

each year and collocating CIE Div 8 with those folks is good. Notice has to be sent 3-4 months

ahead.

Note that in other CIE Divisions the TCs meet once per year. Should ‘customers’ be members of

the CIE committees? Not necessarily.

There are two aspects, meetings for good discussion, and then acting on the outcomes of the

discussion. We need to have follow-up from the discussions to get work done.

CIE is heavily academic, with some industrial participation. Academics can be motivated by

intellectual curiosity. Industry is motivated to enable new product solutions.

Attendees expressed interest in official CIE Div 8 meetings with next CIC and ICC meeting.

Free form discussion of topics for Div 8 work:

Division 1 related works of interest:

1. Clarify and communicate the validity of the colour matching functions. Note: Mark

Fairchild is giving a talk on this in CIC. Address observer metamerism, physiological

colour matching functions.

2. Vision understanding related to the contrast sensitivity function.

3. Parameterization of surface and sub surface reflection, absorption, and emission

behavior as a function of illumination SPD and incident angle – with the goal of

understanding how these contribute to visual appearance. achieved via surface + near

surface reflection and absorption behavior. Can these be described using surface pixel

orientation, two layers of “surface” color, opacity of outer surface, texture map of surface,

BRDF? How is visual appearance dependent/independent of location of light source?

Proposed for Division 8:

Looking at vision from a more subjective point of view – how does it really work and how can

understanding more about vision inform the image re-purposing and re-targeting technologies.

A lot of what is done in re-rendering is not about preserving appearance. There are two aspects,

re-rendering for new optimization and preserving appearance.

Is the psychophysical testing method the CIE uses sufficient? In which situations is Thurston’s

case 5 the correct approach?

Professor Luo proposal: To recommend a gamut for real surface colours with associated spectral

reflectance data.

Surface colour industries (e.g., textiles) would like to determine the set of display primary

colorants (the display gamut) needed to represent the full gamut of surface colors. The

use case is to do display and reproduction of material surface colors. Sun Chemical has

contributed a large collection of spectral data based on modern double-beam

spectrophotometers. Inputs also from ISO print gamut, Pointer’s boundary.

Eric and Jack – there is a need for fundamental work in determining the gamut of real colors in

situ as characterized by their spectral radiances. Translumination characteristics are part of this.

No foundation work has been standardized. Understanding the adopted white in the scene is a

required part of this.

Attendees: Name Representing Email

Sabine Susstrunk EPFL [email protected]

Sergey Bezryadin KWE II [email protected]

Ann McCarthy Lexmark International, Inc. [email protected]

Mark Fairchild RIT [email protected]

Mitch Rosen RIT [email protected]

Ronnie Luo Leeds [email protected]

Changjun Li Leeds [email protected]

David McDowell Kodak [email protected]

Ellen Carter Konica Minolta [email protected]

Ericka Kanematsu Nikon [email protected]

Hitoshi Urabe Fuji Film [email protected]

Craig Revie Fuji Film [email protected]

Arkedy Ten Canon Development Americas [email protected]

John Haikin Canon Development Americas [email protected]

John Dalrymple Sharp Labs [email protected]

Jason Harrison Dolby Laboratories [email protected]

Dragan Sekulovski Philips Research [email protected]

Ingrid Vogels Philips Research [email protected]

Shu Tanabe Toppan Printing [email protected]

Takayuki Hasegawa Toppan Printing [email protected]

Peter Zolliker Empa Dubendorf [email protected]

Yasuki Yamauchi Fuji Xerox [email protected]

Alessandro Ledda Ghent University [email protected]

Ivar Farup Gjøvik University College [email protected]

Graeme Gill Argyll CMS [email protected]

Fumio Nakaya Fuji Xerox [email protected]

Eric Walowit self [email protected]

Marc Mahy Agfa Graphics N.V. [email protected]

Veronika Lovell Sun Chemical [email protected]

Nathan Moroney HP [email protected]

Jack Holm HP [email protected]

Max Derhak Onyx Graphics [email protected]

Uwe-Jens Krabbenhoeft Heidelberg [email protected]

Geoff Woolfe Xerox [email protected]

Rob Buckley Xerox [email protected]

CIE Div 8 Open Meeting

November 6, 2007 1

Division 8 - Imaging Technology

CIE Division 8 Open Meeting

Sabine Süsstrunk, Director, [email protected]

Nathan Moroney, Secretary, [email protected]

Ann McCarthy, Editor, [email protected]

Website: under construction


Agenda

• Short presentation of CIE Division 8

• Short presentations of existing TCs

• Open discussion about current andfuture work


November 6, 2007 2


CIE Division 8

• Commission Internationale de l’Eclairage– International Commission on Illumination

– Internationale Beleuchtungskommission

• 40 National Committees

• 8 Divisions– Div 1: Vision and Colour

– Div 2: Measurement of Light and Radiation

– Div 3: Interior Environment and Lighting Design

– Div 4: Lighting and Signaling for Transport

– Div 5: Exterior Lighting and Other Applications

– Div 6: Photobiology and Photochemistry

– Div 8: Image Technology


Terms of Reference

• To study procedures and prepareguides and standards for the optical,visual and metrological aspects of thecommunication, processing, andreproduction of images, using all typesof analogue and digital imaging devices,storage media and imaging media.


November 6, 2007 3


Workings of Div. 8

• Technical Committees

– A group of expert working on a topic withdefined terms of references

– Outcome: a report or standard

• Reporterships

– One expert investigating a topic

– Outcome: a report


TCs and Current Chairs

• TC8-02 "Colour Difference Evaluation in Images", MR Luo (UK),[email protected]

• TC8-07 "Multispectral Imaging", chairperson: J Parkinen (Finland),[email protected]

• TC8-08 “Spatial Appearance Models”, G Johnson (US),[email protected]

• TC8-09 “Image Archiving”, R Buckley (US),[email protected]

• TC8-10 “Office Illumination for Imaging”, T Newman (US),[email protected]

• TC8-11 “CIECAM02 Mathematics”, C. Li (UK), [email protected]

• TC8-12 “Video Compression Assessment”, Ch. Fernandez-Maloigne(Fr), [email protected]


November 6, 2007 4


TC’s Closed

TC8-01 "Colour Appearance Model for Colour ManagementApplications", chairperson: N Moroney (USA),

TC8-03 "Gamut Mapping", chairperson: J Morovic (UK)

TC8-04 "Adaptation under Mixed Illumination Conditions",chairperson: N Katoh (JP)

TC8-05 "Communication of Colour Information", chairperson: R Buckley (USA),

TC8-06 "Image Technology Vocabulary",chairperson: J Schanda (Hungary),


Reporterships

• R8-05 Image Appearance, M. Fairchild (USA)

• R8-07 CAT in CIECAM02, S. Susstrunk(Switzerland)


November 6, 2007 5


Reporterships Closed

R8-01 Grading of Colour Measurement Equipment Y. Ohno (USA)

R8-02 Fluorescence C.McCamy (USA)

R8-03 Potential Interaction Between CIE and IECTA2

H. Ikeda (JP)

R8-04 Effects of Fluorescence in Characterization ofImaging Media

D. Rich (USA)

R8-06 Results of CIECAM02 N. Moroney (USA)


PublicationsGuidelines for the Evaluation of GamutMapping Algorithms

TC8-03 CIE 156:2004

A Colour Appearance Model for ColourManagement Systems: CIECAM02

TC8-01 CIE 159:2004

Chromatic Adaptation Under MixedIllumination Condition When ComparingSoftcopy and Hardcopy Images

TC8-04 CIE 162:2004

The Effects of Fluorescence in theCharacterization of Imaging Media

R8-05 CIE 163:2004

Criteria for the Evaluation of Extended-GamutColour Encodings

TC8-05 CIE 168:2005


November 6, 2007 6


TCs and Current Chairs

• TC8-02 "Colour Difference Evaluation in Images", MR Luo (UK)

• TC8-07 "Multispectral Imaging", chairperson: J Parkinen (Finland)

• TC8-08 “Spatial Appearance Models”, G Johnson (US)

• TC8-09 “Image Archiving”, R Buckley (US)

• TC8-10 “Office Illumination for Imaging”, T Newman (US)

• TC8-11 “CIECAM02 Mathematics”, C. Li (UK)

• TC8-12 “Video Compression Assessment”, Ch. Fernandez-Maloigne(Fr)


TC8-02: Colour DifferenceEvaluation in Images

• Chair: Ronnier Luo (UK)

– [email protected]

• Report ready for approval by the CIE


November 6, 2007 7


TC8-07 Multispectral Imaging

• TC Changed chairs to Jussi Parkinen


• Terms of references:

– To study, develop, and recommend encodingtechniques and data formats for the exchange ofmultispectral images, and to provide testprocedures for the evaluation of multispectralimaging systems.

• Needs active participation!


TC8-08

• See end of this document


November 6, 2007 8


TC8-09 Image Archiving

• Chair R. Buckley


• Terms of References:– To recommend a set of techniques for the accurate capture,

encoding and longterm preservation of colour descriptions ofdigital images that are either born digital or the result ofdigitizing 2D static physical objects, including documents,maps, photographic materials and paintings.

• Needs active participation!

Division 8 - Imaging TechnologyDivision 8 - Imaging Technology

TC8-10 Office Lighting for Imaging

What is “typical” office lighting?

A sample of potential sources Sources found in my building

Develop guidelines for the experiment

Develop a questionnaire to use with each measurement set

Conduct a pilot study to test the methodology

Revise methodology based on the pilot study

Hold Workshop at CIE Session to start the worldwide study

• Conduct the study – measure lighting in many offices

• Analyze results

Work plan and status:

TC Meeting: Thursday, Nov. 8, Alvarado A/B/C/D 4:30-5:30We need more researchers; please join us


November 6, 2007 9


TC8-11



TC8-12



November 6, 2007 10


• Term of reference– To recommend a gamut for real surface colours with

associated spectral reflectance data.

• Application– To provide relevant data for colour management system,

and associated profile evaluation in an open environment

Real Colour Gamut

-100-50

050

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-100

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100

2000

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(a)

(c)

-100-50

050

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(b)

(d)

(a)

-100-50

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(c)

(b)

-100-50

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(d)


Rationale

1. To recommend a gamut based on reflectance data that can beused to compute colorimetric coordinates for anyilluminant/observer combination.

2. Based on the 'absolute colorimetry' of many real samples ofwhich measurements were made relative to the perfect reflectingdiffuser.

400 450 500 550 600 650 7000

0.1

0.2

0.3

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(a)

400 450 500 550 600 650 7000

0.1

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(b)


November 6, 2007 11


Rationale

3. A large collection of spectra data based on modern double-beamspectrophotometers

0 0.5 1 1.5 2 2.5 3 3.5

x 104

Sun ChemicalMunsell

NCSDIN

Munsell L.C.C.Du Pont S.M.

NaturalISO (Cal. Data)

ISO (Skin)ISO(Flowers)

ISO (Graphics)ISO (Krinov)ISO(Leaves)

ISO (Paint)ISO (Photos)ISO(Printer)ISO(Textile)


Rationale

0 20 40 60 80 100 1200

10

20

30

40

50

60

70

80

90

100 hue = 200

Blue Curve: ISO boundary

Black Curve: Pointer’s Boundary

Isolated Points from

ISO Printer data set

4. To be more consistent

than the existing gamuts.

1

CIE TC8-08

Goals of TC8-08: Guidelinesfor testing HDR rendering

• Standardized HDR Vocabulary

• Summarize State-of-the-Art HDRExperimentation

• Provide Recommendations for Future VisualExperimentation Techniques

2

Standardized Vocabulary• Most important contribution to the community!

• Distinct differences between bit-depth and HDR

• Distinct differences in rendering intent:maximize visibility, pleasant reproduction, colorappearance matches, contrast matching, etc.

• Akin the the color appearance vocabulary:brightness v. lightness, chroma v. colorfulness,etc.

Current Research• Provide an up-to-date reference of existing

HDR experimentation

• Techniques used in existingexperimentation: ranking, magnitudeestimation, paired comparison

• Comparisons to original scenes, or usingHDR displays as an original? Are theredifferences?

3

ExperimentalRecommendations

• Based upon what we have learned fromcurrent research, what guidance can weprovide to future experiments?

• Are there any techniques that have provento be easier, more useful, or provide morerobust results?

• Can we use HDR displays to aid in testingrendering techniques?

1


TC8-11: CIECAM02-Mathematics

• Formed During CIE 26 Session in Beijing, July2007.

• Terms of Reference: To investigate theimprovements to the CIECAM02 model to avoidmathematical inconsistencies;

• Members: Michel Brill , Mark D Fairchild;Youngshin Kwak; Changjun Li; M Ronnier Luo;Nathan Moroney; Sabine Suesstrunk; FranciscoMiguel Martínez Verdú


Problems With CIECAM02

has an infinite slope at the HPE

triangle edge.(Brill, 2006)

Yellow-Blue and Purple Problems

or non nested problem .(Brill &

Suesstrunk,2006)

Failure of computing J = 100

(A/Aw)cz when A = [2 R’a + G’a +

B’a/20 – 0.305]Nbb is negative

(Li & Luo (2005) , Brill &

Suesstrunk (2006) );

( )

( )1.0

100/'13.27

100/'400

42.0

42.0

' +

+

=

RF

RF

R

L

L

a

-0.01 -0.008 -0.006 -0.004 -0.002 0 0.002 0.004 0.006 0.008 0.01-1.5

-1

-0.5

0

0.5

1

1.5

-0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2-0.1

0

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Problems With CIECAM02 and How to solve theproblems

CAT02 gives corresponding colours

with negative X or Y or Z (Verdú

(2006), Spain)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.1

0.2

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0.5

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1

More than 4000

samples under 10

illuminants

Brill & Suesstrunk (2006) proposed to

change CAT02 matrix, but the

problems remain.

The problems have a solution or

The answer seems YES. For example, replace the CAT02 matrix by an

identity matrix.

So our main task is to find a matrix so that the resulting CAT fits

corresponding data sets well and resulting CIECAM02 fits the

appearance data sets well.

not if the structure is not changed?

1

HVS-based quality assessment :

Application to image sequences compression

Pr. Christine Fernandez-MaloigneLaboratory SIC- CNRS 2731

Signal Image Communications

University of Poitiers, FRANCE

tel : 33 5 49 49 65 73 – fax : 33 5 49 49 65 70

email : [email protected]

TC 8-12

TC’s Purpose

Quality assessment is becoming an important

issue with the wide existence of visual

contents.

Several tools have been defined but standards

are very restricted to one domain

TC8-12 aims to provide to the community

subjective tools to deal with different media

and different viewing conditions

2

Addressed domains

Mobile phones, Smart-phones, PDASmall devices and various viewingconditions

Web

Multimedia content

Television, High definition television

Link with MPEG

Digital cinema

Link with JPEG and TC 1-58

Related works

ITU Video Quality Expert Group (VQEG):Test plans: RRNR-tv, Multimedia, HDTV, Hybrid

Mainly objective tools

Advanced Image Coding (AIC) Adhoc groupISO/IEC JTC1/SC29/WG1

Assessment methodologies dedicated tocompression

Objective and subjective tools

! Do not address different media and differentviewing conditions

3

Proposal

Part1 : models of human perception used forquality assessment

Study of the role of human perception in the task ofquality assessment

Part2: Assessment protocolsDefine subjective paradigms adapted to differentmedia and different viewing conditions

Part3: Subjective DatabasesProvide quality assessment databases for differentmedia and viewing condition that allow to study thecorrelation of developed metrics

Liaison with other groups

Liaison statement with JPEG2000

(ISO/IEC JTC1/SC29/WG1)

Dr M.C. LARABI

Liaison statement with VQEG ?

4

Participants (to be completed)

Dr M. Brill, Datacolor, Lawrenceville, NJ, USA

Pr C. Fernandez-Maloigne, University of Poitiers,France

Dr M.C. LARABI, University of Poitiers, France

Pr R. LUO, University of Leeds, UK

Dr L. Gloetzer, Technische Leitung, SCHWARZ FILMAG, Switzerland

Dr M. MAHY, Agfa Gevaert , Belgium

Dr H. SAADANE, Polytehnica School, Nantes, France

Dr. Didier Nicholson, Thalès, France

Prof. Sabine SUSSTRUNK, LCAV, EPFL, Switzerland

d8n135 minutes cie division 8 meeting 6 nov 2007 …cie division 8 meeting 6 nov 2007 officers...

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