Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/2435
Título: | Relational color constancy in achromatic and isoluminant images |
Autor(es): | Nascimento, Sérgio M. C. Foster, David |
Palavras-chave: | Color constancy |
Data: | Fev-2000 |
Editora: | Optical Society of America |
Revista: | Journal of the Optical Society of America A: Optics and Image Science, and Vision |
Citação: | "Journal of the Optical Society of America Optics and Image Science". ISSN 0740-3232 17:2 (2000) 225-231. |
Resumo(s): | Relational color constancy, which refers to the constancy of perceived relations between surface colors under changes in illuminant, may be based on the computation of spatial ratios of cone excitations. As this activity need occur only within rather than between cone pathways, relational color constancy might be assumed to be based on relative luminance processing. This hypothesis was tested in a psychophysical experiment in which observers viewed simulated images of Mondrian patterns undergoing colorimetric changes that could be attributed either to an illuminant change or to a nonilluminant change; the images were isoluminant, achromatic, or unmodified. Observers reliably discriminated the two types of changes in all three conditions, implying that relational color constancy is not based on luminance cues alone. A computer simulation showed that in these isoluminant and achromatic images spatial ratios of cone excitations and of combinations of cone excitations were almost invariant under illuminant changes and that discrimination performance could be predicted from deviations in these ratios. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/2435 |
DOI: | 10.1364/JOSAA.17.000225 |
ISSN: | 0740-3232 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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nascimento_josaa_2000.pdf | 148 kB | Adobe PDF | Ver/Abrir |