Skeleton Extraction of Digital Core Based on Space Ball External Connection

Low extraction efficiency and poor skeleton connectivity are problems in existing core skeleton extraction algorithm. In this paper, we introduce a new geometric skeleton extraction method based on external connection of space ball. This method reconstructed model based on the CT images and obtained tetrahedral solid model by Delaunay segmentation method. According to the characteristics of the tetrahedral models based on the core structure, the center of the sphere is connected by finding topological relations between tetrahedron circumscribed spheres, thus finding the core skeleton. Then a single skeleton which is located in the center of the model can be get after equal calculation and simplified connection. The new algorithm guarantees a series connected skeleton which is not affected by the model boundary quality and suited for the complex core structure. This method achieves a rapid and accurate extraction of the core skeleton.