Polarizational colours could help polarization-dependent colour vision systems to discriminate between shiny and matt surfaces, but cannot unambiguously code surface orientation

Vision Research
Ramón Hegedüs, Gábor Horváth

Abstract

It was hypothesized that egg-laying Papilio butterflies could use polarizational colours as a cue to detect leaf orientation and to discriminate between shiny and matt leaves. These hypotheses would be supported if the following general questions were answered positively: (1) Can surface orientation be unambiguously coded by the polarizational colours perceived by polarization-sensitive colour vision systems? (2) Are the changes in the polarizational colours due to retinal rotation significantly different between shiny and matt surfaces? Using video polarimetry, we measured the reflection-polarizational characteristics of a shiny green hemisphere in the red, green and blue spectral ranges for different solar elevations and directions of view with respect to the solar azimuth as well as for sunlit and shady circumstances under clear skies. The continuously curving hemisphere models numerous differently oriented surfaces. Using the polarization- and colour-sensitive retina model developed earlier, we computed the polarizational colours of the hemisphere, and investigated the correlation between colours and local surface orientation. We also calculated the maximal changes of the polarizational colours of shiny and matt hemispheres...Continue Reading

References

Dec 2, 1999·Nature·A Kelber
May 1, 1993·Proceedings of the National Academy of Sciences of the United States of America·R Wehner, G D Bernard

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Citations

Aug 21, 2015·Vision Research·Gary P MissonPeter J Bryanston-Cross
Nov 8, 2005·Journal of Chemical Ecology·Caroline Müller, Markus Riederer
Nov 21, 2019·Proceedings. Biological Sciences·Adam J BlakeGerhard Gries
Jan 31, 2019·Evolutionary Applications·Bruce A Robertson, Gábor Horváth

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