PMID: 11922130Apr 2, 2002Paper

Articulation: brightness, apparent illumination, and contrast ratios

Perception
J A Schirillo, S K Shevell

Abstract

Luminance edges in the environment can be due to regions that differ in reflectance or in illumination. In three experiments, we varied the spatial organization of 10 achromatic (simulated) surfaces so that some arrangements were consistent with an ecologically valid and parsimonious interpretation of 5 surfaces under two different illuminants. A constant contrast-ratio along a luminance edge in the scene allows this interpretation. The brightness of patches in this condition was compared to their brightness with minimally different spatial arrangements that fail to maintain the constant contrast-ratio criterion. When the spatial arrangement of the 10 surfaces included a luminance edge satisfying the constant contrast-ratio criterion, brightness changed systematically, compared to arrangements without such a luminance edge. We account for the results by positing that a luminance edge with a constant contrast-ratio segments the scene into regions of lower and higher illumination, with the same effect as a difference in real physical illumination: all else equal, a given surface appears brighter under higher than under lower illumination.

References

Dec 1, 1993·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J A Schirillo, S K Shevell
Jan 1, 1997·Perception·J A Schirillo, S K Shevell
Apr 8, 1999·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J A Schirillo
Apr 8, 1999·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·J A Schirillo
Feb 9, 2000·Perception·A D Logvinenko
Aug 1, 1955·Journal of Experimental Psychology·E G HEINEMANN
Jun 1, 1948·Journal of Experimental Psychology·H WALLACH

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Citations

Nov 29, 2002·Dyslexia : the Journal of the British Dyslexia Association·Joel B TalcottJohn F Stein
Jan 24, 2007·Vision Research·Viljami R Salmela, Pentti I Laurinen
Nov 13, 2012·I-Perception·Masataka Sawayama, Eiji Kimura
Sep 23, 2021·Journal of Vision·Charlotte Falkenberg, Franz Faul

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