Bi-cubic non-uniform B-spline surface reconstruction for slice contours

A surface reconstruction method from the slice contours was proposed.First,feature points were extracted based on curvature feature,and they were resampled in order to get a unification of sampling points in each line(column).Then,the sampling points were interpolated to get a bi-cubic non-uniform B-spline surface.Finally,nodes were inserted on the surface based on distance feature at a certain control accuracy,and the new control points through the least-squares approximation method were calculated to get approximate surface within the permissible range error.Based on the characteristics of slice contours,B-spline cycle and non-cycle B-spline combined,and the calculation of closed and non-closed surface was discussed.It was found that the combination of interpolation and approximation makes the algorithm more rapid and practical.