Spatial distributions of local illumination color in natural scenes
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/43973 |
Resumo: | In natural complex environments, the elevation of the sun and the presence of occluding objects and mutual reflections cause variations in the spectral composition of the local illumination across time and location. Unlike the changes in time and their consequences for color appearance and constancy, the spatial variations of local illumination color in natural scenes have received relatively little attention. The aim of the present work was to characterize these spatial variations by spectral imaging. Hyperspectral radiance images were obtained from 30 rural and urban scenes in which neutral probe spheres were embedded. The spectra of the local illumination at 17 sample points on each sphere in each scene were extracted and a total of 1904 chromaticity coordinates and correlated color temperatures (CCTs) derived. Maximum differences in chromaticities over spheres and over scenes were similar. When data were pooled over scenes, CCTs ranged from 3000 K to 20,000 K, a variation of the same order of magnitude as that occurring over the day. Any mechanisms that underlie stable surface color perception in natural scenes need to accommodate these large spatial variations in local illumination color. |
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Spatial distributions of local illumination color in natural scenesColor VisionHumansVisual PerceptionLightLightingNatural scenesColor constancyIllumination variationHyperspectral imagingCorrelated color temperatureCiências Naturais::Ciências FísicasScience & TechnologySocial SciencesIn natural complex environments, the elevation of the sun and the presence of occluding objects and mutual reflections cause variations in the spectral composition of the local illumination across time and location. Unlike the changes in time and their consequences for color appearance and constancy, the spatial variations of local illumination color in natural scenes have received relatively little attention. The aim of the present work was to characterize these spatial variations by spectral imaging. Hyperspectral radiance images were obtained from 30 rural and urban scenes in which neutral probe spheres were embedded. The spectra of the local illumination at 17 sample points on each sphere in each scene were extracted and a total of 1904 chromaticity coordinates and correlated color temperatures (CCTs) derived. Maximum differences in chromaticities over spheres and over scenes were similar. When data were pooled over scenes, CCTs ranged from 3000 K to 20,000 K, a variation of the same order of magnitude as that occurring over the day. Any mechanisms that underlie stable surface color perception in natural scenes need to accommodate these large spatial variations in local illumination color.This work was supported by the Centro de Física of Minho University, Braga, Portugal, by the European Regional Development Fund through Program COMPETE (FCOMP-01-0124-FEDER-009858/029564), by the National Portuguese funds through Fundação para a Ciência e a Tecnologia, Portugal (Grants PTDC/EEA-EEL/098572/2008 and PTDC/MHC-PCN/4731/2012), and by the Engineering and Physical Sciences Research Council, United Kingdom (Grants GR/R39412/01, EP/B000257/1 and EP/E056512/1). We thank Paulo D. A. Pinto and João M. M. Linhares for collaboration in the acquisition of hyperspectral data of some scenes and Paulo D. A. Pinto for the preparation of the gray spheres.ElsevierUniversidade do MinhoNascimento, Sérgio M. C.Amano, KinjiroFoster, David H.2016-032016-03-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/43973engNascimento, S. M. C., Amano, K., & Foster, D. H. (2016). Spatial distributions of local illumination color in natural scenes. Vision Research, 120, 39-44. doi: 10.1016/j.visres.2015.07.0050042-698910.1016/j.visres.2015.07.00526291072info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:59:23Zoai:repositorium.sdum.uminho.pt:1822/43973Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:49:09.858180Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Spatial distributions of local illumination color in natural scenes |
title |
Spatial distributions of local illumination color in natural scenes |
spellingShingle |
Spatial distributions of local illumination color in natural scenes Nascimento, Sérgio M. C. Color Vision Humans Visual Perception Light Lighting Natural scenes Color constancy Illumination variation Hyperspectral imaging Correlated color temperature Ciências Naturais::Ciências Físicas Science & Technology Social Sciences |
title_short |
Spatial distributions of local illumination color in natural scenes |
title_full |
Spatial distributions of local illumination color in natural scenes |
title_fullStr |
Spatial distributions of local illumination color in natural scenes |
title_full_unstemmed |
Spatial distributions of local illumination color in natural scenes |
title_sort |
Spatial distributions of local illumination color in natural scenes |
author |
Nascimento, Sérgio M. C. |
author_facet |
Nascimento, Sérgio M. C. Amano, Kinjiro Foster, David H. |
author_role |
author |
author2 |
Amano, Kinjiro Foster, David H. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Nascimento, Sérgio M. C. Amano, Kinjiro Foster, David H. |
dc.subject.por.fl_str_mv |
Color Vision Humans Visual Perception Light Lighting Natural scenes Color constancy Illumination variation Hyperspectral imaging Correlated color temperature Ciências Naturais::Ciências Físicas Science & Technology Social Sciences |
topic |
Color Vision Humans Visual Perception Light Lighting Natural scenes Color constancy Illumination variation Hyperspectral imaging Correlated color temperature Ciências Naturais::Ciências Físicas Science & Technology Social Sciences |
description |
In natural complex environments, the elevation of the sun and the presence of occluding objects and mutual reflections cause variations in the spectral composition of the local illumination across time and location. Unlike the changes in time and their consequences for color appearance and constancy, the spatial variations of local illumination color in natural scenes have received relatively little attention. The aim of the present work was to characterize these spatial variations by spectral imaging. Hyperspectral radiance images were obtained from 30 rural and urban scenes in which neutral probe spheres were embedded. The spectra of the local illumination at 17 sample points on each sphere in each scene were extracted and a total of 1904 chromaticity coordinates and correlated color temperatures (CCTs) derived. Maximum differences in chromaticities over spheres and over scenes were similar. When data were pooled over scenes, CCTs ranged from 3000 K to 20,000 K, a variation of the same order of magnitude as that occurring over the day. Any mechanisms that underlie stable surface color perception in natural scenes need to accommodate these large spatial variations in local illumination color. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-03 2016-03-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/43973 |
url |
http://hdl.handle.net/1822/43973 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nascimento, S. M. C., Amano, K., & Foster, D. H. (2016). Spatial distributions of local illumination color in natural scenes. Vision Research, 120, 39-44. doi: 10.1016/j.visres.2015.07.005 0042-6989 10.1016/j.visres.2015.07.005 26291072 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799132254843174912 |