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Band-limited Wavelets and Framelets in Low Dimensions

机译:小尺寸的带限小波和小框架

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摘要

In this paper, we study the problem of constructing non-separable bandlimited wavelet tight frames, Riesz wavelets and orthonormal wavelets in R~2 and R~3. We first construct a class of non-separable band-limited refinable functions in lowdimensional Euclidean spaces by using univariate Meyer's refinable functions along multiple directions defined by classical box-spline direction matrices. These nonseparable band-limited definable functions are then used to construct non-separable band-limited wavelet tight frames via the unitary and oblique extension principles. However, these refinable functions cannot be used for constructing Riesz wavelets and orthonormal wavelets in low dimensions as they are not stable. Another construction scheme is then developed to construct stable refinable functions in low dimensions by using a special class of direction matrices. The resulting stable refinable functions allow us to construct a class of MRA-based non-separable band-limited Riesz wavelets and particularly band-limited orthonormal wavelets in low dimensions with small frequency support.
机译:本文研究了在R〜2和R〜3中构造不可分带有限小波紧框架,Riesz小波和正交小波的问题。我们首先通过沿经典箱形样条方向矩阵定义的多个方向使用单变量Meyer可细化函数,在低维欧几里得空间中构造了一类不可分的带限可细化函数。然后,这些不可分离的带限可定义函数用于通过via和斜扩展原理构造不可分离的带限小波紧帧。但是,由于这些不稳定的函数不稳定,因此无法用于构造维数较小的Riesz小波和正交小波。然后,开发了另一种构造方案,以通过使用特殊类别的方向矩阵来构造低维的稳定可提炼函数。由此产生的稳定可提炼函数使我们能够构建一类基于MRA的不可分离的带限Riesz小波,尤其是低频率支持,低维的带限正交小波。

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