Investigating shape-from-shading illusions using solid objects

Vision Research
A Johnston, W Curran

Abstract

Recent growth in the shape-from-shading psychophysics literature has been paralleled by an increasing availability of computer graphics hardware and software, to the extent that most psychophysical studies in this area now employ computer lighting algorithms. The most widely used of these algorithms in shape-from-shading psychophysics is the Phong lighting model. This model, and other shading models of its genre, produce readily interpretable images of three-dimensional scenes. However, such algorithms are only approximations of how light interacts with real objects in the natural environment. Nevertheless, the results from psychophysical experiments using these techniques have been used to infer the processes underlying the perception of shape-from-shading in natural environments. It is important to establish whether this substitution is ever valid. We report a series of experiments investigating whether two recently reported illusions seen in computer-generated, Phong shaded images occur for solid objects under real illuminants. The two illusions investigated are three-dimensional curvature contrast and the illuminant-position effect on perceived curvature. We show that both effects do occur for solid objects, and that the ma...Continue Reading

References

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Citations

Oct 5, 2010·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Monika Hedrich, Marina Bloj
Jun 7, 2002·Perception & Psychophysics·Corrado CaudekMassimiliano Di Luca
Jan 20, 1999·Vision Research·J Seyama, T Sato
Dec 19, 1998·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·S Nishida, M Shinya
Apr 12, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Alexa I Ruppertsberg, Marina Bloj

Related Concepts

Computer Graphics
Depth Perception
Form Perception
Lighting
Models, Structural
Optical Illusions
Psychophysics
Contrast Sensitivity

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