Anisotropic filtering

Anisotropic filtering is a technique used in graphics to produce textures with varying spatial frequency distributions in different directions and reduce aliasing effects along edges without blurring them. It performs multiple samples to determine the average color visible to the viewer when a texture is viewed at any angle that is not perpendicular to the camera's line of sight and returns this combined color.From: Dictionary of Computer Science, Engineering, and Technology [2017], Practical Rendering and Computation with Direct3D 11 [2019]

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Published in Phillip A. Laplante, Dictionary of Computer Science, Engineering, and Technology, 2017

Phillip A. Laplante

anisotropic filtering image filtering that produces different amounts of filtering (e.g., smoothing filtering in different directions at each pixel in an image). Two uses of anisotropic filtering in graphics are to: (1) produce textures with different spatial frequency distributions in different directions, and (2) to reduce aliasing effects along edges without blurring the edges as much. Anisotropic filtering can be done in either the image or the frequency domains.

Mean fields and fluctuations in compressible magnetohydrodynamic flows

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Published in Geophysical & Astrophysical Fluid Dynamics, 2022

James F. Hollins, Graeme R. Sarson, Cetin Can Evirgen, Anvar Shukurov, Andrew Fletcher, Frederick A. Gent

Gaussian smoothing (or filtering with any other kernel) is not technically or conceptually more difficult to implement and interpret than any other averaging method, but it requires an appropriate filtering scale to be identified. The Gaussian kernel used here is isotropic but the filtering approach also offers the opportunity to use anisotropic kernels wherever appropriate. This can be specially important in the case of the velocity field; for example, SN remnants expand more strongly along the density gradient in galactic discs, and the hot gas is buoyant. It is reasonable to expect that the magnetic field reflects such features of the gas flow and application of an anisotropic filtering kernel might lead to a clearer physical picture, although this would introduce an additional parameter, the degree of the kernel anisotropy. This situation is quite similar to that with the anisotropic wavelet decomposition (e.g. Patrikeev et al.2006).

Anisotropic filtering

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Mean fields and fluctuations in compressible magnetohydrodynamic flows