@TechReport{Knapp:2003:SAT,
  author =      "Michael Knapp and Armin Karnitsar and Eduard Gröller",
  title =       "Semi-Automatic Topology Independent Contour-Based 2 1/2 D Segmentation Using Live-Wire",
  year =        "2003",
  month =       mar,
  pages =       "1--10",
  keywords =    "segmentation, live-wire, image processing, connectivity graph",
  number =      "TR-186-2-03-06",
  institution = "Institute of Computer Graphics and Algorithms,
                 Vienna University of Technology",
  address =     "Karlsplatz 13/186/2, A-1040 Vienna, Austria",
  ftp =         "ftp://ftp.cg.tuwien.ac.at/pub/TR/03/TR-186-2-03-06Paper.ps.gz",
  note =        "human contact: technical-report@cg.tuwien.ac.at",
  abstract =    "In general three-dimensional segmentation algorithms assume
                 objects to have connected homogeneous regions. However in some
                 cases objects are defined by a fuzzy boundary surface and consist
                 of an inhomogeneous internal structure. In the following a new
                 three-dimensional segmentation technique exploiting the contour
                 detection capabilities of live-wire is proposed: The algorithm
                 consists of two basic steps. First contours are outlined by the
                 user on a small number of planar cross-sections through the object
                 using live-wire. Second the traced contours are used for
                 reconstructing the object surface automatically in each slice
                 using live-wire again. This user-friendly segmentation algorithm
                 is independent from object topology as the topology is implicitly
                 defined during the reconstruction process."  
}