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• W2051131372 abstract "Divided differences play a fundamental role in the construction of univariate B-splines over irregular knot sequences. Unfortunately, generalizations of divided differences to irregular knot geometries on two-dimensional domains are quite limited. As a result, most spline constructions for such domains typically focus on regular (or semi-regular) knot geometries. In the planar harmonic case, we show that the discrete Laplacian plays a role similar to that of the divided differences and can be used to define well-behaved harmonic B-splines. In our main contribution, we then construct an analogous discrete bi-Laplacian for both planar and curved domains and show that its corresponding biharmonic B-splines are also well-behaved. Finally, we derive a fully irregular, discrete refinement scheme for these splines that generalizes knot insertion for univariate B-splines." @default.
• W2051131372 created "2016-06-24" @default.
• W2051131372 creator A5011006135 @default.
• W2051131372 creator A5019375732 @default.
• W2051131372 date "2012-07-01" @default.
• W2051131372 modified "2023-10-14" @default.
• W2051131372 title "Discrete bi-Laplacians and biharmonic b-splines" @default.
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• W2051131372 doi "https://doi.org/10.1145/2185520.2185611" @default.
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