Image analysis – Applications – Biomedical applications
Patent
1996-03-11
1998-06-02
Johns, Andrew
Image analysis
Applications
Biomedical applications
382154, 395120, G06K 900
Patent
active
057613320
ABSTRACT:
A method of reconstructing the surface of an object by the boundary element method (BEM), approximately describes a measured, closed object surface (K) by a number of initial triangles, the position of the vertices (E1, E2) of which is known and also the normals (n.sub.1, n.sub.2) to the measured object surface (K) at these vertices (E1, E2), the initial triangles are replaced by sub-triangles, having no more than two vertices corresponding to vertices of an initial triangle (E1, E), in order to enhance the approximative description. An as accurate as possible description of the surface is obtained at little cost in respect of storage time and calculation time in that a curved connecting line (P) is determined through two vertices of the initial triangle (E1, E2) in such a manner that the connecting line (P) extends perpendicularly to the normals (n.sub.1, n.sub.2) at the vertices of the initial triangle (E1, E2), and in that a new vertex of a sub-triangle (E31) is chosen on the curved connecting line (P).
REFERENCES:
patent: 4831528 (1989-05-01), Crawford et al.
patent: 5012190 (1991-04-01), Dossel
patent: 5189626 (1993-02-01), Colburn
patent: 5440674 (1995-08-01), Park
patent: 5506947 (1996-04-01), Taubin
patent: 5517602 (1996-05-01), Natarajan
Excerpt pp. 382-391, IEEE Transactions On Biomedical Engineering, vol.36, No.3, Mar., 1989 "Source Parameter Estimation in Inhomogeneous Volume Conductors of Arbitrary Shape", Thom F. Oostendorp and Adriaan Van Oosterom.
Drenckhahn Ralf
Wischmann Hans-Aloys
Johns Andrew
Slobod Jack D.
U.S. Philips Corporation
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