title: SFS? Not likely….
abstract: SFS (Shape From Shading) theory is based upon the Lambertian paradigm. Our visual demonstrations imply that this paradigm fails to apply to the conventional stimuli used to probe vision.
authors.affiliation: Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Tiensestraat 102 Box 3711, B-3000 Leuven, Belgium; and Faculteit Sociale Wetenschappen, Psychologische Functieleer, Universiteit Utrecht, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands; e-mail: Jan.Koenderink@ppw.kuleuven.be.
authors.forename: Jan
authors.initials: J
authors.lastname: Koenderink
authors.affiliation: Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Tiensestraat 102 Box 3711, B-3000 Leuven, Belgium; and Faculteit Sociale Wetenschappen, Psychologische Functieleer, Universiteit Utrecht, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands; e-mail: andrea.vandoorn@telfort.nl.
authors.forename: Andrea
authors.initials: A
authors.lastname: van Doorn
authors.affiliation: Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Tiensestraat 102 Box 3711, B-3000 Leuven, Belgium; e-mail: Johan.Wagemans@psy.kuleuven.be.
authors.forename: Johan
authors.initials: J
authors.lastname: Wagemans
keywords: luminance gradient; outline; shading; shape; surface