Rational quadratic approximation to real algebraic curves

  • Authors:
  • Xiao-Shan Gao;Ming Li

  • Affiliations:
  • Key Lab of Mathematics Mechanization, Institute of Systems Science, AMSS, Academia Sinica, Beijing 100080, China;Key Lab of Mathematics Mechanization, Institute of Systems Science, AMSS, Academia Sinica, Beijing 100080, China

  • Venue:
  • Computer Aided Geometric Design - Special issue: Geometric modeling and processing 2004
  • Year:
  • 2004

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Abstract

An algorithm is proposed to give a global approximation of an implicit real plane algebraic curve with rational quadratic B-spline curves. The algorithm consists of four steps: topology determination, curve segmentation, segment approximation and curve tracing. Due to the detailed geometric analysis, high accuracy of approximation may be achieved with a small number of quadratic segments. The final approximation keeps many important geometric features of the original curve such as the topology, convexity and sharp points. Our method is implemented and experiments show that it may achieve better approximation bound with less segments than previously known methods. We also extend the method to approximate spatial algebraic curves.