Geodesic
A geometrical description of visual sensation II
Kragujevac Journal of Mathematics, Tome 34 (2010) no. 1 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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Plateau's irradiation phenomenon in particular describes what one sees when observing a brighter object on a darker background and a physically congruent darker object on a brighter background: the brighter object is seen as being larger. This phenomenon occurs in many optical visual illusions and it involves some fundamental aspects of human vision. We present a general geometrical model of human visual sensation and perception, hereby taking into account the law of Fechner in addition to the anisotropic smoothing that was introduced in [1], and explicitly illustrate its meaning for irradiation illusions of Helmholtz and Kitaoka. 
@article{KJM_2010_34_1_a0,
     author = {Bart Ons and Paul Verstraelen},
     title = {A geometrical description of visual sensation {II}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {5 - 24},
     year = {2010},
     volume = {34},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a0/}
}
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Bart Ons; Paul Verstraelen. A geometrical description of visual sensation II. Kragujevac Journal of Mathematics, Tome 34 (2010) no. 1. http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a0/