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Positive blending Hermite rational cubic spline fractal interpolation surfaces

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Abstract

Fractal interpolation provides an efficient way to describe data that have smooth and non-smooth structures. Based on the theory of fractal interpolation functions (FIFs), the Hermite rational cubic spline FIFs (fractal boundary curves) are constructed to approximate an original function along the grid lines of interpolation domain. Then the blending Hermite rational cubic spline fractal interpolation surface (FIS) is generated by using the blending functions with these fractal boundary curves. The convergence of the Hermite rational cubic spline FIS towards an original function is studied. The scaling factors and shape parameters involved in fractal boundary curves are constrained suitably such that these fractal boundary curves are positive whenever the given interpolation data along the grid lines are positive. Our Hermite blending rational cubic spline FIS is positive whenever the corresponding fractal boundary curves are positive. Various collections of fractal boundary curves can be adapted with suitable modifications in the associated scaling parameters or/and shape parameters, and consequently our construction allows interactive alteration in the shape of rational FIS.

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Acknowledgments

The first author is thankful to the Science and Engineering Research Council, Department of Science and Technology India (Project No. SR/S4/MS: 694/10). The authors are thankful to the anonymous referee for valuable suggestions.

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Authors and Affiliations

  1. Department of Mathematics, Indian Institute of Technology Madras, Chennai,  600036, India

    A. K. B. Chand & N. Vijender

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  1. A. K. B. Chand
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  2. N. Vijender
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Correspondence to A. K. B. Chand.

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Chand, A.K.B., Vijender, N. Positive blending Hermite rational cubic spline fractal interpolation surfaces. Calcolo 52, 1–24 (2015). https://doi.org/10.1007/s10092-013-0105-5

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