title: Straightness as a cue for luminance edge interpretation.
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.
authors.affiliation: Glasgow Caledonian University, Glasgow, Scotland. a.logvinenko@gcal.ac.uk
authors.forename: Alexander D
authors.initials: AD
authors.lastname: Logvinenko
authors.forename: Edward H
authors.initials: EH
authors.lastname: Adelson
authors.forename: Deborah A
authors.initials: DA
authors.lastname: Ross
authors.forename: David
authors.initials: D
authors.lastname: Somers
mesh_terms: D001288:Attention; D015350:Contrast Sensitivity; D004193:Discrimination Learning; D006801:Humans; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics