When Shadows Become Interreflections
International Journal of Computer Vision - Special issue on computer vision research at NEC Research Institute
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International Journal of Computer Vision
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Proceedings of the 2003 ACM SIGGRAPH/Eurographics symposium on Computer animation
International Journal of Computer Vision - Special Issue on Texture Analysis and Synthesis
A Two-Level Generative Model for Cloth Representation and Shape from Shading
IEEE Transactions on Pattern Analysis and Machine Intelligence
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Proceedings of the 4th symposium on Applied perception in graphics and visualization
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Reconstructing shape from dictionaries of shading primitives
ACCV'12 Proceedings of the 11th Asian conference on Computer Vision - Volume Part IV
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Diffuse interreflections cause effects that make current theories of shape from shading unsatisfactory. We show that distant radiating surfaces produce radiosity effects at low spatial frequencies. This means that, if a shading pattern has a small region of support, unseen surfaces in the environment can only produce effects that vary slowly over the support region. It is therefore relatively easy to construct matching processes for such patterns that are robustto interreflections. We call regions with these patterns "shading primitives."Folds and grooves on surfaces provide two examples of shading primitives; the shading pattern is relatively independent of surface shape at a fold or a groove, and the pattern is localised. We show that the pattern of shading can be predicted accurately by a simple model, and derive a matching process from this model. Both groove and fold matchers are shown to work well on images of real scenes.