基于格林函数的小波

A. Baghai-Wadji, G. Walter
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引用次数: 8

摘要

提出了一种基于边值问题格林函数构造小波的新方法。我们首先描述了这个想法背后的理性,然后给出了我们第一个成功的结果,关于尺度函数和与拉普拉斯算子相关的小波。我们得到了母小波和由拉普拉斯算子导出的标度函数的闭形式解。我们已经确定了我们的小波和相关的缩放函数的几个性质:这些函数中的每一个都对应于平行线的电荷中性序列。我们的小波对应于电荷密度为1、-2和1的三条等距线的电位分布。我们的缩放函数对应于一个无限数组的元素因子。此外,我们将证明与拉普拉斯算子相关的无限类小波正交系统的存在性。这一事实保证了在构造适当的对称和非对称基函数时具有很大的灵活性。最后讨论了亥姆霍兹波动方程,构造了亥姆霍兹算子的标度函数和小波。许多计算可以以封闭形式进行,从而可以讨论这些新函数的几个迷人的性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Green's function-based wavelets
We propose a new approach for the construction of wavelets based on Green's functions associated with boundary value problems. We first describe the rational behind this idea, and then present our first successful results concerning the scaling function and the wavelet associated with Laplace operator. We obtain closed form solutions for the mother wavelet and the scaling function derived from the Laplace operator. We have identified several properties of our wavelet and the associated scaling function: Each of these functions corresponds to a charge-neutral sequence of parallel lines. Our wavelet corresponds to the potential distribution of three equidistant lines with the charge densities 1,-2, and 1. Our scaling function corresponds to the element factor of an infinite array. Furthermore, we will demonstrate the existence of an infinite family of wavelet-like orthogonal systems associated with the Laplace operator. This fact guarantees great flexibilty in constructing appropriate symmetric and asymmetric bases functions. Finally we proceed to the Helmholz wave equation, and construct the scaling function and the wavelet associated with the Helmholz operator. Many of the calculations can be carried out in closed form, allowing to discuss several fascinating properties of these new functions.
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