Method and system for distinguishing surfaces in 3d data...

G - Physics – 06 – T

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G06T 17/20 (2006.01)

Patent

CA 2544909

A system and method for creating a surface for an arbitrary segment of a three- dimensional data set are presented. In exemplary embodiments according to the present invention the method includes initially identifying a set of surface voxels of the segment. For each voxel in the set information as to which of its neighbors are inside voxels can be obtained, and the results can be utilized to determine the location and direction of a polygonal surface dividing the voxel. The surface can then be obtained by connecting all of the polygonal surfaces. In exemplary embodiments according to the present invention the polygonal surfaces can comprise triangles. In exemplary embodiments according to the present invention the surface can be displayed in either a wireframe mode or a solid mode. In exemplary embodiments according to the present invention mesh reduction can be implemented to reduce the number of polygons in the final surface. In exemplary embodiments of the present invention the volume bounded by the mesh surface can be calculated. Additionally, if the mesh surface generated is not a closed surface, as when, for example, the segmented object has been cropped prior to generation of the mesh surface, any "holes" within it can be closed by a mesh and then the volume can be calculated.

L'invention concerne un système et un procédé pour créer une surface pour un segment arbitraire d'un ensemble de données tridimensionnelles. Dans certains modes de réalisation, ce procédé consiste à d'abord identifier un ensemble de voxels de surface du segment. Pour chaque voxel de l'ensemble, on peut obtenir l'information indiquant les voisins respectifs des voxels internes, les résultats pouvant servir à déterminer l'emplacement et la direction d'une surface polygonale divisant le voxel. La surface peut être obtenue par liaison de toutes les surfaces polygonales. En fonction du mode de réalisation de la présente invention, les surfaces polygonales peuvent comprendre des triangles, la surface peut être affichée en mode filaire ou en mode solide, une réduction de maillage peut être réalisée pour réduire le nombre des polygones dans la surface finale, le volume défini par la surface de maillage peut être calculé. En outre, si la surface de maillage générée n'est pas une surface close, lorsque, par exemple, l'objet segmenté a été coupé avant la génération de la surface de maillage, tous les <=trous>= intérieurs peuvent être fermés par maillage pour ensuite pouvoir calculer le volume.

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