Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/7007
Título: Brightness versus apparent contrast. 3: Blurred disks and concentric cosine gratings.
Autor: du Buf, J. M. H.
Data: 1992
Editora: Brill Academic Publishers
Resumo: Matching either the centre-brightness or the apparent contrast of incremental 1-deg disks, with varying edge-sharpness, yields quite different results. These suggest that the maximum brightness gradient at the edge determines apparent-contrast perception. However, no significant differences are found in matching the brightness maxima, the brightness minima, or the apparent contrast of concentric cosine gratings with varying spatial frequency. This means that spatial frequency influences both brightness extremes in the same way, and that apparent contrast is a function of the difference between the brightness extremes. The grating results therefore deviate from the results obtained with sharp as well as blurred disks. These contradictions complicate the construction of a model which unifies suprathreshold disk and grating perception.
Peer review: yes
URI: http://hdl.handle.net/10400.1/7007
ISSN: 0169-1015
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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