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- W2000762099 abstract "We describe and study geometric properties of discrete circular and spherical means of directional derivatives of functions, as well as discrete approximations of higher order differential operators. For an arbitrary dimension we present a general construction for obtaining discrete spherical means of directional derivatives. The construction is based on using the Minkowski's existence theorem and Veronese maps. Approximating the directional derivatives by appropriate finite differences allows one to obtain finite difference operators with good rotation invariance properties. In particular, we use discrete circular and spherical means to derive discrete approximations of various linear and nonlinear first- and second-order differential operators, including discrete Laplacians. A practical potential of our approach is demonstrated by considering applications to nonlinear filtering of digital images and surface curvature estimation." @default.
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- W2000762099 date "2012-01-01" @default.
- W2000762099 modified "2023-10-18" @default.
- W2000762099 title "Discrete spherical means of directional derivatives and Veronese maps" @default.
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- W2000762099 doi "https://doi.org/10.1016/j.geomphys.2011.09.005" @default.
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