Papers › Clothoid Fitting and Geometric Hermite Subdivision
Clothoid Fitting and Geometric Hermite Subdivision
Ulrich Reif, Andreas Weinmann
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We consider geometric Hermite subdivision for planar curves, i.e., iteratively refining an input polygon with additional tangent or normal vector information sitting in the vertices. The building block for the (nonlinear) subdivision schemes we propose is based on clothoidal averaging, i.e., averaging w.r.t. locally interpolating clothoids, which are curves of linear curvature. To define clothoidal averaging, we derive a new strategy to approximate Hermite interpolating clothoids. We employ the proposed approach to define the geometric Hermite analogues of the well-known Lane-Riesenfeld and four-point schemes. We present results produced by the proposed schemes and discuss their features. In particular, we demonstrate that the proposed schemes yield visually convincing curves.
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