Algebraic conditions on non-stationary subdivision symbols for exponential polynomial reproduction

Authors:
Costanza Conti;Lucia Romani
Affiliations:
Dipartimento di Energetica "Sergio Stecco", Universití di Firenze, Via Lombroso 6/17, 50134 Firenze, Italy;Dipartimento di Matematica e Applicazioni, Universití di Milano-Bicocca, Via R. Cozzi 53, 20125 Milano, Italy
Venue:
Journal of Computational and Applied Mathematics
Year:
2011

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Abstract

We present an accurate investigation of the algebraic conditions that the symbols of a non-singular, univariate, binary, non-stationary subdivision scheme should fulfill in order to reproduce spaces of exponential polynomials. A subdivision scheme is said to possess the property of reproducing exponential polynomials if, for any initial data uniformly sampled from some exponential polynomial function, the scheme yields the same function in the limit. The importance of this property is due to the fact that several curves obtained by combinations of exponential polynomials (such as conic sections, spirals or special trigonometric and hyperbolic functions) are considered of interest in geometric modeling. Since the space of exponential polynomials trivially includes standard polynomials, this work extends the theory on polynomial reproduction to the non-stationary context. A significant application of the derived algebraic conditions on the subdivision symbols is the construction of new non-stationary subdivision schemes with specific reproduction properties.