TY  - ABST
AU  - Jordi Roca
AU  - C. Alejandro Parraga
AU  - Maria Vanrell
PY  - 2012//
TI  - Predicting categorical colour perception in successive colour constancy
T2  - PER
BT  - Perception
SP  - 138
VL  - 41
N2  - Colour constancy is a perceptual mechanism that seeks to keep the colour of objects relatively stable under an illumination shift. Experiments haveshown that its effects depend on the number of colours present in the scene. Westudied categorical colour changes under different adaptation states, in particular, whether the colour categories seen under a chromatically neutral illuminant are the same after a shift in the chromaticity of the illumination. To do this, we developed the chromatic setting paradigm (2011 Journal of Vision11 349), which is as an extension of achromatic setting to colour categories. The paradigm exploits the ability of subjects to reliably reproduce the most representative examples of each category, adjusting multiple test patches embedded in a coloured Mondrian. Our experiments were run on a CRT monitor (inside a dark room) under various simulated illuminants and restricting the number of colours of the Mondrian background to three, thus weakening the adaptation effect. Our results show a change in the colour categories present before (under neutral illumination) and after adaptation (under coloured illuminants) with a tendency for adapted colours to be less saturated than before adaptation. This behaviour was predicted by a simpleaffine matrix model, adjusted to the chromatic setting results.
SN  - 0301-0066
UR  - http://www.perceptionweb.com/abstract.cgi?id=v120614
L1  - http://refbase.cvc.uab.es/files/RPV2012.pdf
N1  - CIC
ID  - Jordi Roca2012
ER  -