G2/C1 Hermite interpolation of offset curves of parametric regular curves

In this paper we presented a method of G2 Hermite interpolation of offset curves of regular plane curves based on approximating the normal vector fields. We showed that our approximant is also C1 Hermite interpolation of the offset curve. Our method is capable of achieving circular precision. Another advantage of our method is that if the input curve is a polynomial curve, then our method also yields a polynomial curve. Our approximation method was applied to numerical examples and its numerical results were compared to previous offset approximation methods. It was observed that our method is almost optimal with respect to the number of control points of the approximation curves for the same tolerance.