Reconstruction of 3D B-Spline Surface of Femoral Anatomic Structure

Rectangular bicubic non-uniform B-spline patches are exploited to fit the sampled data points of femoral.Knot vectors for constructing the longitudinal and transverse boundaries are defined as a compromised average of all section curves in each direction respectively.Spacing of knots is assigned conforming to the local curvature of femoral surface,being shorter at ridge area of large curvature and longer at flat area.