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shearl
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There are 6 letters in SHEARL ( A1E1H4L1R1S1 )
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Definitions of shearl in various dictionaries:
SHEARL - In applied mathematical analysis, shearlets are a multiscale framework which allows efficient encoding anisotropic features in multivariate problem c...
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In applied mathematical analysis, shearlets are a multiscale framework which allows efficient encoding anisotropic features in multivariate problem classes. Originally, shearlets were introduced in 2006 for the analysis as well as sparse approximation of functions * * * * f * ∈ * * L * * 2 * * * ( * * * R * * * 2 * * * ) * * * {\displaystyle f\in L^{2}(\mathbb {R} ^{2})} * . They are a natural extension of wavelets, to accommodate the fact that multivariate functions are typically governed by anisotropic features such as edges in images, since wavelets, as isotropic objects, are not capable of capturing such phenomena. * Shearlets are constructed by parabolic scaling, shearing and translation applied to a few generating functions. At fine scales, they are essentially supported within skinny and directional ridges following the parabolic scaling law, which reads length² ≈ width. Similar to wavelets, shearlets arise from the affine group and allow a unified treatment of the continuum and digital situation leading to faithful implementations. Although they do not constitute an orthonormal basis for * * * * * L * * 2 * * * ( * * * R * * * 2 * * * ) * * * {\displaystyle L^{2}(\mathbb {R} ^{2})} * , they still form a frame allowing stable expansions of arbitrary functions * * * * f * ∈ * * L * * 2 * * * ( * * * R * * * 2 * * * ) * * * {\displaystyle f\in L^{2}(\mathbb {R} ^{2})} * . * One of the most important properties of shearlets is the fact that they provide optimally sparse approximations (in the sense of optimality in ) for cartoon-like functions * * * * f * * * {\displaystyle f} * . In imaging sciences, cartoon-like functions serve as a model for anisotropic features and are compactly supported in * * * * [ * 0 * , * 1 * * ] * * 2 * * * * * {\displaystyle [0,1]^{2}} * while being * * * * * C * * 2 * * * * * {\displaystyle C^{2}} * apart from a closed piecewise * * * * * C * * 2 * * * * * {\displaystyle C^{2}} * singularity curve with bounded curvature. The decay rate of the * * * * * L * * 2 * * * * * {\displaystyle L^{2}} * -error of the * * * * N * * * {\displaystyle N} * -term shearlet approximation obt... |