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High dynamic range - a gateway for predictive ancient lighting

2009-07Journal article Open access
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datacite.subject.fosHumanidades
datacite.subject.fosCiências Naturais::Ciências da Computação e da Informação
datacite.subject.sdg08:Trabalho Digno e Crescimento Económico
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
datacite.subject.sdg10:Reduzir as Desigualdades
dc.contributor.authorGonçalves, Alexandrino José Marques
dc.contributor.authorMagalhães, Luís
dc.contributor.authorMoura, João
dc.contributor.authorChalmers, Alan
dc.date.accessioned2025-05-19T17:41:43Z
dc.date.available2025-05-19T17:41:43Z
dc.date.issued2009-07
dc.descriptionArtigo n.º 3
dc.description.abstractIn the last few years, the number of projects involving historical reconstruction has increased significantly. Recent technologies have proven a powerful tool for a better understanding of our cultural heritage through which to attain a glimpse of the environments in which our ancestors lived. However, to accomplish such a purpose, these reconstructions should be presented to us as they may really have been perceived by a local inhabitant, according to the illumination and materials used back then and, equally important, the characteristics of the human visual system. The human visual system has a remarkable ability to adjust itself to almost all everyday scenarios. This is particularly evident in extreme lighting conditions, such as bright light or dark environments. However, a major portion of the visible spectra captured by our visual system cannot be represented in most display devices. High dynamic range imagery is a field of research which is developing techniques to correct such inaccuracies. This new viewing paradigm is perfectly suited for archaeological interpretation, since its high contrast and chromaticity can present us with an enhanced viewing experience, closer to what an inhabitant of that era may have seen. In this article we present a case study of the reconstruction of a Roman site. We generate high dynamic range images of mosaics and frescoes from one of the most impressive monuments in the ruins of Conimbriga, Portugal, an ancient city of the Roman Empire. To achieve the requisite level of precision, in addition to having a precise geometric 3D model, it is crucial to integrate in the virtual simulation authentic physical data of the light used in the period under consideration. Therefore, in order to create a realistic physical-based environment, we use in our lighting simulations real data obtained from simulated Roman luminaries of that time.eng
dc.description.sponsorshipWe would like to thank: V. Correia, Director of the Monographic Museum of Conimbriga, for his support, expertise, and full access to the museum archives, artefacts, and ruins; P. Fiadeiro who kindly allowed access to the Optic Centre of the Beira Interior University for our tests with the spectroradiometer; A. Videira and S. Gomes, students at School of Management and Technology of the Polytechnic Institute of Leiria, for their contribution in the development of the 3D model and digital manipulation of some textures; and to J. Anjo from Anjo & Carpinteiro—Passamanarias, Lda. who generously offered the wicks for our lighting experiments.
dc.identifier.citationGonçalves, A., Magalhaes, L., Moura J., and Chalmers, A. 2009. High dynamic range—A gateway for predictive ancient lighting. ACM J. Comput. Cult. Herit. 2, 1, Article 3 (July 2009), 20 pages. DOI = 10.1145/1551676.1551679 http://doi.acm.org/10.1145/1551676.1551679.
dc.identifier.doi10.1145/1551676.1551679
dc.identifier.eissn1556-4711
dc.identifier.issn1556-4673
dc.identifier.urihttp://hdl.handle.net/10400.8/12932
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAssociation for Computing Machinery (ACM)
dc.relation.hasversionhttps://dl.acm.org/doi/10.1145/1551676.1551679
dc.relation.ispartofJournal on Computing and Cultural Heritage
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAlgorithms
dc.subjectExperimentation
dc.subjectHuman Factors
dc.subjectHigh dynamic range
dc.subjectvisualization
dc.subjecteye adaptation
dc.subjectConimbriga
dc.titleHigh dynamic range - a gateway for predictive ancient lightingeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage20
oaire.citation.issue1
oaire.citation.startPage1
oaire.citation.titleJournal on Computing and Cultural Heritage
oaire.citation.volume2
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameJosé Marques Gonçalves
person.givenNameAlexandrino
person.identifier.ciencia-id0F12-C50E-BFE2
person.identifier.orcid0000-0002-5966-3218
person.identifier.scopus-author-id35092342500
relation.isAuthorOfPublication1114eda0-de42-4761-94ca-b48f98fc811f
relation.isAuthorOfPublication.latestForDiscovery1114eda0-de42-4761-94ca-b48f98fc811f

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In the last few years, the number of projects involving historical reconstruction has increased significantly. Recent technologies have proven a powerful tool for a better understanding of our cultural heritage through which to attain a glimpse of the environments in which our ancestors lived. However, to accomplish such a purpose, these reconstructions should be presented to us as they may really have been perceived by a local inhabitant, according to the illumination and materials used back then and, equally important, the characteristics of the human visual system. The human visual system has a remarkable ability to adjust itself to almost all everyday scenarios. This is particularly evident in extreme lighting conditions, such as bright light or dark environments. However, a major portion of the visible spectra captured by our visual system cannot be represented in most display devices. High dynamic range imagery is a field of research which is developing techniques to correct such inaccuracies. This new viewing paradigm is perfectly suited for archaeological interpretation, since its high contrast and chromaticity can present us with an enhanced viewing experience, closer to what an inhabitant of that era may have seen. In this article we present a case study of the reconstruction of a Roman site. We generate high dynamic range images of mosaics and frescoes from one of the most impressive monuments in the ruins of Conimbriga, Portugal, an ancient city of the Roman Empire. To achieve the requisite level of precision, in addition to having a precise geometric 3D model, it is crucial to integrate in the virtual simulation authentic physical data of the light used in the period under consideration. Therefore, in order to create a realistic physical-based environment, we use in our lighting simulations real data obtained from simulated Roman luminaries of that time.
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