Perception of light source distance from shading patterns
نویسندگان
چکیده
منابع مشابه
Light Source Dependence in Shape from Shading
We investigated shape constancy in human shape from shading under variations of illuminant direction using a local attitude probe in conjunction with a perturbation analysis. Stimuli were computer generated and depicted ellipsoids in a structured setting. Even with these simple shapes subjects settings were systematically biased in the illuminant direction and were consistent with a regression ...
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How do humans see three-dimensional shape based on two-dimensional shading? Much research has assumed that a 'light from above' bias solves the ambiguity of shape from shading. Counter to the 'light from above' bias, studies of Bayesian priors have found that such a bias can be swayed by other light cues. Despite the persuasive power of the Bayesian models, many new studies and books cite the o...
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Shape from shading is a classical inverse problem in computer vision. This shape reconstruction problem is inherently ill-defined; it depends on the assumed light source direction. We introduce a novel mathematical formulation for calculating local surface shape based on covariant derivatives of the shading flow field, rather than the customary integral minimization or P.D.E approaches. On smoo...
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A new photometric method is proposed fo r determining the 3-D shape of t he object from multiple shading Images under the point light source illumination. When the surface is t he perfect diffuser with the uniform reflectance, an algorithm fo r the determination of 3-D shape with positions is developed by using the method of least squares and basing on the principle of the monocular vision and ...
متن کاملShape and Source from Shading
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2016
ISSN: 1534-7362
DOI: 10.1167/16.3.9