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Issue No.06 - November/December (2010 vol.16)
pp: 1595-1604
Thomas Schultz , Computer Science Department and the Computation Institute, University of Chicago
Gordon L. Kindlmann , Computer Science Department and the Computation Institute, University of Chicago
ABSTRACT
Symmetric second-order tensor fields play a central role in scientific and biomedical studies as well as in image analysis and feature-extraction methods. The utility of displaying tensor field samples has driven the development of visualization techniques that encode the tensor shape and orientation into the geometry of a tensor glyph. With some exceptions, these methods work only for positive-definite tensors (i.e. having positive eigenvalues, such as diffusion tensors). We expand the scope of tensor glyphs to all symmetric second-order tensors in two and three dimensions, gracefully and unambiguously depicting any combination of positive and negative eigenvalues. We generalize a previous method of superquadric glyphs for positive-definite tensors by drawing upon a larger portion of the superquadric shape space, supplemented with a coloring that indicates the quadratic form (including eigenvalue sign). We show that encoding arbitrary eigenvalue magnitudes requires design choices that differ fundamentally from those in previous work on traceless tensors that arise in the study of liquid crystals. Our method starts with a design of 2-D tensor glyphs guided by principles of scale-preservation and symmetry, and creates 3-D glyphs that include the 2-D glyphs in their axis-aligned cross-sections. A key ingredient of our method is a novel way of mapping from the shape space of three-dimensional symmetric second-order tensors to the unit square. We apply our new glyphs to stress tensors from mechanics, geometry tensors and Hessians from image analysis, and rate-of-deformation tensors in computational fluid dynamics.
INDEX TERMS
Tensor Glyphs, Stress Tensors, Rate-of-Deformation Tensors, Geometry Tensors, Glyph Design
CITATION
Thomas Schultz, Gordon L. Kindlmann, "Superquadric Glyphs for Symmetric Second-Order Tensors", IEEE Transactions on Visualization & Computer Graphics, vol.16, no. 6, pp. 1595-1604, November/December 2010, doi:10.1109/TVCG.2010.199
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