Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/43974
Registo completo
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Foster, David H. | por |
dc.contributor.author | Amano, Kinjiro | por |
dc.contributor.author | Nascimento, Sérgio M. C. | por |
dc.date.accessioned | 2016-12-28T23:26:11Z | - |
dc.date.available | 2016-12-28T23:26:11Z | - |
dc.date.issued | 2016-03 | - |
dc.identifier.citation | Foster, D. H., Amano, K., & Nascimento, S. M. C. (2016). Time-lapse ratios of cone excitations in natural scenes. Vision Research, 120, 45-60. doi: 10.1016/j.visres.2015.03.012 | por |
dc.identifier.issn | 0042-6989 | por |
dc.identifier.uri | https://hdl.handle.net/1822/43974 | - |
dc.description.abstract | The illumination in natural environments varies through the day. Stable inferences about surface color might be supported by spatial ratios of cone excitations from the reflected light, but their invariance has been quantified only for global changes in illuminant spectrum. The aim here was to test their invariance under natural changes in both illumination spectrum and geometry, especially in the distribution of shadows. Time-lapse hyperspectral radiance images were acquired from five outdoor vegetated and nonvegetated scenes. From each scene, 10,000 pairs of points were sampled randomly and ratios measured across time. Mean relative deviations in ratios were generally large, but when sampling was limited to short distances or moderate time intervals, they fell below the level for detecting violations in ratio invariance. When illumination changes with uneven geometry were excluded, they fell further, to levels obtained with global changes in illuminant spectrum alone. Within sampling constraints, ratios of cone excitations, and also of opponent-color combinations, provide an approximately invariant signal for stable surface-color inferences, despite spectral and geometric variations in scene illumination. | por |
dc.description.sponsorship | This work was supported by the Engineering and Physical Sciences Research Council, United Kingdom (Grant Nos. GR/R39412/01, EP/B000257/1, and EP/E056512/1). We thank Iván Marín-Franch for advice on statistical analysis and Oscar González for critical comments on the manuscript. | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.rights | openAccess | por |
dc.subject | Color Perception | por |
dc.subject | Contrast Sensitivity | por |
dc.subject | Humans | por |
dc.subject | Photic Stimulation | por |
dc.subject | Retinal Cone Photoreceptor Cells | por |
dc.subject | Time-Lapse Imaging | por |
dc.subject | Lighting | por |
dc.subject | Natural scenes | por |
dc.subject | Optical environment | por |
dc.subject | Shadows | por |
dc.subject | Spatial cone-excitation ratios | por |
dc.subject | Color constancy | por |
dc.subject | Illumination geometry | por |
dc.title | Time-lapse ratios of cone excitations in natural scenes | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
sdum.publicationstatus | info:eu-repo/semantics/publishedVersion | por |
oaire.citationStartPage | 45 | por |
oaire.citationEndPage | 60 | por |
oaire.citationTitle | Vision research | por |
oaire.citationVolume | 120 | por |
dc.identifier.doi | 10.1016/j.visres.2015.03.012 | por |
dc.identifier.pmid | 25847405 | por |
dc.subject.fos | Ciências Naturais::Ciências Físicas | por |
dc.subject.wos | Science & Technology | por |
dc.subject.wos | Social Sciences | por |
sdum.journal | Vision research | por |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
VR Foster, Amano, Nascimento 2015.pdf | 4,35 MB | Adobe PDF | Ver/Abrir |