Abstract
In order to determine the reflectance of a surface, it is necessary to discount luminance changes produced by illumination variation, a process that requires the visual system to respond differently to luminance changes that are due to illumination and reflectance. It is known that various cues can be used in this process. By measuring the strength of lightness illusions, we find evidence that straightness is used as a cue: When a boundary is straight rather than curved, it has a greater tendency to be discounted, as if it were an illumination edge. The strongest illusions occur when a boundary has high contrast and has multiple X-junctions that preserve a consistent contrast ratio.
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Logvinenko, A.D., Adelson, E.H., Ross, D.A. et al. Straightness as a cue for luminance edge interpretation. Perception & Psychophysics 67, 120–128 (2005). https://doi.org/10.3758/BF03195016
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DOI: https://doi.org/10.3758/BF03195016