Fractional and complex pseudo-splines and the construction of Parseval frames

Fractional and complex pseudo-splines and the construction of Parseval frames
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分数和复杂的伪样条以及 Parseval 框架的构造

DOI:
10.1016/j.amc.2017.06.023
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发表时间:
2017
期刊:
Appl. Math. Comput.
影响因子:
--
通讯作者:
Peter Massopust
Peter Massopust
中科院分区:
--
文献类型:
--
作者:
Ole Christensen;Brigitte Forster;Peter Massopust

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整数阶(m,m)的伪样条是由Daubechies,Han,罗恩和Shen作为一个允许在经典B样条和Daubechies尺度函数之间插值的族引入的。本文的目的是将伪样条推广到分数阶和复数阶(z,n),其中α ∈ Re z≥ 1.这就增加了光滑性方面的灵活性:而不是使用来自C m,m∈ N 0的离散函数族,而是使用属于赫尔德空间C α− 1的连续函数族。z的虚部的存在允许在用于信号和图像分析的复变换技术中直接利用。我们还表明,在模拟的整数情况下,广义伪样条导致Parseval小波框架的建设通过酉扩张原则。讨论了这类广义样条的正则性和逼近阶。
Pseudo-splines of integer order (m, ℓ) were introduced by Daubechies, Han, Ron, and Shen as a family which allows interpolation between the classical B-splines and the Daubechies’ scaling functions. The purpose of this paper is to generalize the pseudo-splines to fractional and complex orders (z, ℓ) with α≔ Re z≥ 1. This allows increased flexibility in regard to smoothness: instead of working with a discrete family of functions from C m, m∈ N 0, one uses a continuous family of functions belonging to the Hölder spaces C α− 1. The presence of the imaginary part of z allows for direct utilization in complex transform techniques for signal and image analyses. We also show that in analogue to the integer case, the generalized pseudo-splines lead to constructions of Parseval wavelet frames via the unitary extension principle. The regularity and approximation order of this new class of generalized splines is also discussed.
DOI: 10.1016/j.acha.2005.07.003
发表时间: 2006-03-01
影响因子: 2.5
作者:
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