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Search: L773:0769528775

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1.
  • Norell, Kristin, et al. (author)
  • Grey Weighted Polar Distance Transform for Outlining Circular and Approximately Circular Objects
  • 2007
  • In: 14th International Conference on Image Analysis and Processing. - 0769528775 ; , s. 647-652
  • Conference paper (peer-reviewed)abstract
    • We introduce the polar distance transform and the grey weighted polar distance transform for computation of minimum cost paths preferring circular shape, as well as give algorithms for implementations in a digital setting. An alternative to the polar distance transform is to transform the image to polar coordinates, and then apply a Cartesian distance transform. By using the polar distance transform, re-sampling of the image and interpolation of new pixel values are avoided. We also handle the case of grey weighted distance transform in a $5\times 5$ neighbourhood, which, to our knowledge, is new. Initial results of using the grey weighted polar distance transform to outline annual rings in images of log end faces are presented.
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2.
  • Strand, Robin, et al. (author)
  • Topology preserving marching cubes-like algorithms on the face-centered cubic grid
  • 2007
  • In: 14TH INTERNATIONAL CONFERENCE ON IMAGE ANALYSIS AND PROCESSING, PROCEEDINGS. - LOS ALAMITOS : IEEE COMPUTER SOC. - 9780769528779 - 0769528775 ; , s. 781-786
  • Conference paper (other academic/artistic)abstract
    • The well-known marching cubes algorithm is modified to apply to the face-centered cubic (fcc) grid. Thus, the local configurations that are considered when extracting the local surface patches are not cubic anymore. This paper presents three different partitionings of the fcc grid to be used for the local configurations. The three candidates are evaluated theoretically and experimentally and compared with the original marching cubes algorithm. It is proved that the reconstructed surface is topologically equivalent to the surface of the original object when the surface of the original object that is digitized is smooth and a sufficiently dense fcc grid is used.
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  • Result 1-2 of 2
Type of publication
conference paper (2)
Type of content
other academic/artistic (1)
peer-reviewed (1)
Author/Editor
Strand, Robin (1)
Lindblad, Joakim (1)
Norell, Kristin (1)
Svensson, Stina (1)
Stelldinger, Peer (1)
University
Uppsala University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2007 (2)

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