Positive blending Hermite rational cubic spline fractal interpolation surfaces. (English) Zbl 1310.28005
Summary: 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.
MSC:
| 28A80 | Fractals |
| 65D05 | Numerical interpolation |
| 14Q10 | Computational aspects of algebraic surfaces |
| 34D45 | Attractors of solutions to ordinary differential equations |
| 37C25 | Fixed points and periodic points of dynamical systems; fixed-point index theory; local dynamics |
Keywords:
fractals; iterated function systems; fractal interpolation functions; blending functions; fractal interpolation surfaces; positivityReferences:
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