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**Approximate implicitization using linear algebra.**
*(English)*
Zbl 1235.65018

Summary: We consider a family of algorithms for approximate implicitization of rational parametric curves and surfaces. The main approximation tool in all of the approaches is the singular value decomposition, and they are therefore well suited to floating-point implementation in computer-aided geometric design (CAGD) systems. We unify the approaches under the names of commonly known polynomial basis functions and consider various theoretical and practical aspects of the algorithms. We offer new methods for a least squares approach to approximate implicitization using orthogonal polynomials, which tend to be faster and more numerically stable than some existing algorithms. We propose several simple propositions relating the properties of the polynomial bases to their implicit approximation properties.

### MSC:

65D17 | Computer-aided design (modeling of curves and surfaces) |

14Q05 | Computational aspects of algebraic curves |

14Q10 | Computational aspects of algebraic surfaces |

15-04 | Software, source code, etc. for problems pertaining to linear algebra |

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\textit{O. J. D. Barrowclough} and \textit{T. Dokken}, J. Appl. Math. 2012, Article ID 293746, 25 p. (2012; Zbl 1235.65018)

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