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Issue No.01 - January/February (2010 vol.16)
pp: 109-119
Thomas Schultz , MPI Informatik, Saarbruecken
Holger Theisel , University of Magdeburg, Magdeburg
Hans-Peter Seidel , MPI Informatik, Saarbruecken
Crease surfaces are two-dimensional manifolds along which a scalar field assumes a local maximum (ridge) or a local minimum (valley) in a constrained space. Unlike isosurfaces, they are able to capture extremal structures in the data. Creases have a long tradition in image processing and computer vision, and have recently become a popular tool for visualization. When extracting crease surfaces, degeneracies of the Hessian (i.e., lines along which two eigenvalues are equal) have so far been ignored. We show that these loci, however, have two important consequences for the topology of crease surfaces: First, creases are bounded not only by a side constraint on eigenvalue sign, but also by Hessian degeneracies. Second, crease surfaces are not, in general, orientable. We describe an efficient algorithm for the extraction of crease surfaces which takes these insights into account and demonstrate that it produces more accurate results than previous approaches. Finally, we show that diffusion tensor magnetic resonance imaging (DT-MRI) stream surfaces, which were previously used for the analysis of planar regions in diffusion tensor MRI data, are mathematically ill-defined. As an example application of our method, creases in a measure of planarity are presented as a viable substitute.
Height crease, ridge surface, valley surface, tensor topology, DT-MRI stream surface.
Thomas Schultz, Holger Theisel, Hans-Peter Seidel, "Crease Surfaces: From Theory to Extraction and Application to Diffusion Tensor MRI", IEEE Transactions on Visualization & Computer Graphics, vol.16, no. 1, pp. 109-119, January/February 2010, doi:10.1109/TVCG.2009.44
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