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Perceptually Valid Images of Conimbriga Using High Dynamic Range
Alexandrino José Marques Gonç[email protected]
November 4th, 2010
Supervisors:João Paulo Moura (University of Trás-os-Montes and Alto
Douro)Alan Chalmers (University of Warwick, UK)
A thesis submitted to the University of Trás-os-Montes and Alto Douro in accordance with the requirements for the degree of Doctor of Philosophy
Motivation
Purpose
Results
Contributions
Conclusions
“The (Roman light) image makes me feel so warm… it makes me comfortable.”Sicheng Zhang _
Outline02
Do Cultural Heritage environments be
presented like their period in time? Do we perceive them equally?
Do we ‘look’ at them the same way?
Do we have the equivalent archaeological,
religious or architectural interpretation?
Are there clear benefits of using high fidelity
visualization in a cultural heritage context?
“The (Roman light) image... changes the colours of the frescoes and mosaic.”Nick Papanikolaou _
Motivation03
Civilization Roman;
Locale Conimbriga, Portugal.
Specificities Roman illumination;
Roman artefacts (frescoes and mosaics);
Dim conditions (no windows).“Oil lamps in a roman villa…”
Simon Scarle_
Motivation / Case Study04
Produce accurate and perceptually valid
high fidelity images of Conimbriga’s Roman
frescoes and mosaics.
Conduct a perceptual visual user study with
those high fidelity images.
“...making the room more attractive, the environment more soothing and relaxing...”Muhammad Latif_
Purpose05
High fidelity 3D model
High fidelity visualization
“The (electric light) image looked dull.”Sharon Edgar_
How to…06
Geometry;
Materials;
Ancient flame light simulation.
High Dynamic Range.
“...the low colour-temperature illumination is more in keeping with the original scenario.”Michael Goldsmith_
HDR… why?07
CIE Chromaticity Diagram
“The room looked to be old, therefore candlelight appeared to give the room a warm glow…”Gavin Edwards_
Results / Illumination experiments 0
8
Oil samples:
“...gave me an impression of warmth and softness.”Zaboronski Oleg_
09
Results / Illumination experiments
A special attention must be given to the origin and manufacture procedure of the fuel.
Additives:
“… (the electric light image) showing little shading effects and not highlighting colours and shapes.”
Thomas Rogers_
Results / Illumination experiments 1
0
We should also consider possible additives in ancient fuels as well.
“Looks warmer.”Arno Sawyer_
11
Results / Renderings
Real vs Virtual:
“More relaxing.”Margaret Arms_
12
Results / Renderings
Real vs Virtual:
“Warm. Comforting.”Weryaun(?) Zhuo_
13
Results / Renderings
“The (electric light) image… introduced more of a cold environment.”Carlo Harvey_
14
Results / Renderings
“The lighting in the image provides a more exciting/intriguing/mysterious ambience.”Hilmi Jaidin_
15
Results / Perceptual experiments
“… yellow light produces more vivid colours.”Matt Wakelin _
16
Results / Perceptual experiments
“The candle light is well captured…”Ioannis Agrafiotis _
17
Results / Perceptual experimentsEye tracking results: HDR images
“The light accentuates the colours and seems to change them.”Leigh Blount _
18
Results / Perceptual experimentsWhat is the colour of the circumferences viewed in the mosaic floor?
“... I liked it more because of the warm colours.”Elmedin Selmanovic _
19
Results / Perceptual experimentsWhich image did you like most?
“… (the electric light image) seems pale.”Himanshu Patel_
20
Results / Perceptual experimentsEye tracking results: HDR vs LDR (tone mapped image)
HDR LDR
The authentic Roman flame light simulation Awareness of the origin and manufacture procedure of the
fuel;
Consider possible additives to the fuel.
The cultural heritage high fidelity images
The perceptual visual user study using HDR Perceptual differences;
Viewing pattern altered;
Ancient light led to richer chromatic impression of the scene;
Visual acuity of HDR stand out in extreme lighting conditions.
“… is more natural in terms of lighting in olden days from which the frescoes appears to be.”Vibhor Aggarwal _
Contributions21
Publications
Gonçalves A., Magalhães L., Moura J., Chalmers A.
“Visualização de Espaços Arqueológicos usando High
Dynamic Range”. In Proceedings of V Congresso
CAAPortugal de Aplicações Informáticas à Arqueologia,
Leiria. 2007.
Gonçalves A., Magalhães L., Moura J., Chalmers A.
“Metodologia para Geração de Imagens High Dynamic
Range em Iluminação Romana”. In Proceedings of
International Association for the Scientific Knowledge -
InterTIC’07, Porto. 2007.
22
“... creates better contrast and highlights important areas of the scene.”Francesco Banterle_
PublicationsGonçalves A., Magalhães L., Moura J., Chalmers A. “High Fidelity
Illumination in Archaeology - A Roman Legacy in Portugal”. In 6th
World Archaeological Congress, WAC, Dublin. 2008.
23
Gonçalves A., Magalhães L., Moura J., Chalmers
A. “Accurate Modelling of Roman Lamps in
Conimbriga Using High Dynamic Range”. In
Proceedings of VAST 2008: International
Symposium on Virtual Reality, Archaeology
and Cultural Heritage, Braga. Eurographics.
2008.
Award: Best Paper Award“(The electric light image) was less pleasing and colourful…”Carlo Harvey_
Publications
Gonçalves A., Magalhães L., Moura J., Chalmers A.“Perceptual
Images of Conimbriga Using High Dynamic Range”. Journal
of Archaeological Science. Elsevier . 2011 (?).
24
Gonçalves A., Magalhães L., Moura J.,
Chalmers A. “High Dynamic Range - A
Gateway for Predictive Ancient Lighting”.
ACM Journal on Computing and Cultural
Heritage (JOCCH) 2(1): 1-20. ACM. 2009.
“... highlighting the colours and designs.”Gareth Edwards _
State of the Art Reports
Happa J., Mudge M., Debattista K., Artusi A., Gonçalves A.,
Chalmers A. “STAR Report on Illuminating the Past”. In
Proceedings of VAST 2009: International Symposium on
Virtual Reality, Archaeology and Cultural Heritage, Malta.
Eurographics. 2009.
Happa J., Mudge M., Debattista K., Artusi A., Gonçalves A.,
Chalmers A. “Illuminating the past: state of the art”. Virtual
Reality Journal, 14(3): 155-182. Springer. 2010.
25
“The (electric light) image looked very hash...which did not bring out the details in the mosaics...”
Gavin Edwards_
Article in Scientific Magazine26
NewScientist. “Ancient artefacts show up in a more flattering
light”. New Scientist Magazine (August 2009). 2720: 20.
2009.
“The (Roman light) image... was quite pleasing to the eyes.”Hardik Raja_
“… it is more clear that the room is Roman…”Isaac Lewis_
Conclusions27
Do Cultural Heritage environments be
presented like their period in time? Do we perceive them equally?
Do we ‘look’ at them the same way?
Do we have the equivalent archaeological,
religious or architectural interpretation?
Are there clear benefits of using high fidelity
visualization in a cultural heritage context?
No
No
Surely not
Yes
Absolutely
Alexandrino José Marques Gonç[email protected]
“The (Roman) light seemed to give it a whole new atmosphere.”
Leonhard Widrich
Perceptually Valid Images of Conimbriga Using High Dynamic Range