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Träfflista för sökning "(WFRF:(Soderkvist P)) srt2:(1994)"

Search: (WFRF:(Soderkvist P)) > (1994)

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1.
  • Nystrom, L., et al. (author)
  • A NOTE ON SOME IDENTIFICATION PROBLEMS ARISING IN ROENTGEN STEREO PHOTOGRAMMETRIC ANALYSIS
  • 1994
  • In: Journal of Biomechanics. ; 27:10, s. 1291-1294
  • Journal article (peer-reviewed)abstract
    • When studying skeleton movements by using implanted landmarks and Roentgen stereo photogrammetric analysis (RSA), some identification problems arise. One is to put the same label on a landmark at different examinations, another is to use the correct pairs of landmark images in order to compute a correct three-dimensional position of each landmark. We will present some methods that can be used as a support for solving these problems. We will also show how it is possible to detect and exclude landmarks that are loose and landmarks that have large measurement errors in their positions.
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2.
  • Soderkvist, I., et al. (author)
  • ON CONDITION NUMBERS AND ALGORITHMS FOR DETERMINING A RIGID-BODY MOVEMENT
  • 1994
  • In: Bit. ; 34:3, s. 424-436
  • Journal article (peer-reviewed)abstract
    • Using a set of landmarks to represent a rigid body, a rotation of the body can be determined in least-squares sense as the solution of an orthogonal Procrustes problem. We discuss some geometrical properties of the condition number for the problem of determining the orthogonal matrix representing the rotation. It is shown that the condition number critically depends on the configuration of the landmarks. The problem is also reformulated as an unconstrained nonlinear least-squares problem and the condition number is related to the geometry of such problems. In the common 3-D case, the movement can be represented by using a screw axis. Also the condition numbers for the problem of determining the screw axis representation are shown to closely depend on the configuration of the landmarks. The condition numbers are finally used to show that the used algorithms are stable.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Wedin, P.A. (2)
Soderkvist, I. (2)
Nystrom, L (1)
University
Umeå University (2)
Language
English (2)
Year
1994 (2)Undo refine

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