The information available to a moving observer from specularities
Image and Vision Computing - 4th Alvey Vision Meeting
A Theory of Specular Surface Geometry
International Journal of Computer Vision
IEEE Transactions on Visualization and Computer Graphics
Local Shape from Mirror Reflections
International Journal of Computer Vision
Extracting and depicting the 3D shape of specular surfaces
APGV '05 Proceedings of the 2nd symposium on Applied perception in graphics and visualization
Sketching shiny surfaces: 3D shape extraction and depiction of specular surfaces
ACM Transactions on Applied Perception (TAP)
Image invariants for smooth reflective surfaces
ECCV'10 Proceedings of the 11th European conference on Computer vision: Part II
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Three-dimensional shape may be perceived from static images. Contours, shading, texture gradients, perspective and occlusion are well-studied cues to this percept. When looking at a picture of a specular object, such as a silver vase, one additional cue is potentially available: a deformed picture of the reflected environment is seen in the surface of the object and the amount and type of deformation depend on its shape. Can specular reflections be used as a visual cue for shape perception? Our experiments show that our subjects are very poor at judging the shape of mirror surfaces in absence of other visual cues. However, for a considerable subset of the stimuli, subjects are highly consistent in their (most often wrong) perception. This observation leads us to the hypothesis that our subjects rather than 'computing' a percept from each image based on geometrical considerations, may be associating a shape to each pattern in a stereotypical way, akin to pattern-matching. This behavior is reasonable since, as suggested by our ideal observer analysis, the information available from specular reflections is ambiguous when the surrounding world is (partially) unknown.