On the convergence of hybrid polynomial approximation to higher derivatives of rational curves |
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Authors: | Guo-Jin Wang Chiew-Lan Tai |
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Institution: | 1. State Key Laboratory of CAD&CG and Department of Mathematics, Zhejiang University, Hangzhou 310027, PR China;2. Department of Computer Science and Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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Abstract: | In this paper, we derive the bounds on the magnitude of l th (l=2,3) order derivatives of rational Bézier curves, estimate the error, in the L∞ norm sense, for the hybrid polynomial approximation of the l th (l=1,2,3) order derivatives of rational Bézier curves. We then prove that when the hybrid polynomial approximation converges to a given rational Bézier curve, the l th (l=1,2,3) derivatives of the hybrid polynomial approximation curve also uniformly converge to the corresponding derivatives of the rational curve. These results are useful for designing simpler algorithms for computing tangent vector, curvature vector and torsion vector of rational Bézier curves. |
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Keywords: | 41A10 41A17 |
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