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Shape and Reflectance of Objects
Shape from PolarisationShape-from-polarisation is a method for determining the orientation of surfaces based on the polarisation state of light reflected from the surface. In [Atkinson and Hancock 2006a] we showed how Fresnel theory can be used to relate the angle of reflection to the polarisation state of light in the diffuse reflection regime. This allows the recovery of surface normals from polarisation images of objects, although the directions are still ambiguous. These ambiguities can be resolved using photometric stereo[Atkinson and Hancock 2005a] We extended this work in [Atkinson and Hancock 2005b] where we established a directional reflectance model for the surface.Contact: Edwin Hancock Combining Stereo and Surface OrientationStereo algorithms can be used to extract 3D structure from a pair (or more) of images. Stereo is very effective where good correspondences can be found, i.e. where there is clear surface texture, but fails on smooth surfaces. Surface orientation can be found from a variety of sources, such as shape from shading or texture, and can be used to extract 3D information from a single image. However, this information is not accurate enough or complete enough to satisfactorily reconstruct the surface. The aim of this work is to combine these two methods to produce a more effective and complete reconstruction. The combination can be done through a probabilistic model of the surface depth, such as a suitable Markov random field.Contact: Richard Wilson
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