February 2022
Volume 22, Issue 3
Open Access
Optica Fall Vision Meeting Abstract  |   February 2022
Contributed Session III: Disentangling object color from illuminant color: The role of color shifts
Author Affiliations
  • Cehao Yu
    Perceptual Intelligence lab (π-lab), Delft University of Technology, The Netherlands
  • Maarten Wijntjes
    Perceptual Intelligence lab (π-lab), Delft University of Technology, The Netherlands
  • Elmar Eisemann
    Computer Graphics and Visualization Group, Delft University of Technology, The Netherlands
  • Sylvia Pont
    Perceptual Intelligence lab (π-lab), Delft University of Technology, The Netherlands
Journal of Vision February 2022, Vol.22, 37. doi:https://doi.org/10.1167/jov.22.3.37
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      Cehao Yu, Maarten Wijntjes, Elmar Eisemann, Sylvia Pont; Contributed Session III: Disentangling object color from illuminant color: The role of color shifts. Journal of Vision 2022;22(3):37. doi: https://doi.org/10.1167/jov.22.3.37.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Research has shown that disentangling surface and illuminant colors was possible based on various scene statistics. This study investigates the statistical cues induced by the chromatic effects of interreflections. We present a numerical analysis of ambiguous spectral pairs, in which the spectral power distribution of the illuminant in one scene matched the surface reflectance function in the other scene and vice versa. If the scenes are flat or convex and perfectly matte (Lambertian), the reflected light spectra of both cases are identical. However, the incident light undergoes interreflections for concave scenes. The spectral power of interreflections will be absorbed spectrally in an exponential way, dependent on the number of interreflections. We found that this causes systematic shifts towards the spectral reflectance peaks, resulting in brightness, saturation and hue shifts. Those paired cases' color differences (CIEDE2000) are so large that humans would be able to observe them if viewed simultaneously. In addition, we find that the color shifts cause qualitatively different gradients for chromatic materials and achromatic light and vice versa. Further psychophysical testing is necessary to see whether the different color shifts for the two cases can be recognized in isolation due to material or light properties. Moreover, the light densities and light vectors are spectrally different for these cases, creating different appearances of 3D objects in non-empty rooms.

Footnotes
 Funding: This work has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 765121; project "DyViTo".
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