共查询到19条相似文献,搜索用时 343 毫秒
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对称反对称紧支撑正交多小波的构造 总被引:1,自引:0,他引:1
对于给定的对称反对称紧支撑正交r重尺度函数,给出一种构造对称反对称紧支撑正交多小波的方法.通过此方法构造的多小波与尺度函数有相同的对称性与反对称性,并且给出算例. 相似文献
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1 引言 在小波的构造和应用中,对于2尺度单一小波已有相当成熟的理论,特别是在小波构造方面,若知道正交单一尺度函数,相应的单一小波是很容易构造出的。对于a尺度紧支撑多小波,如何从已知的a尺度紧支撑多重尺度函数构造出相应的多小波,到目前为止尚没有一般的构造方法。W.Lanton等用仿酉矩阵扩充的方法构造出相应的多小 相似文献
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[0,1]区间上的r重正交多小波基 总被引:6,自引:1,他引:6
本文利用L2(R)上的紧支撑正交的多尺度函数和多小波构造出有限区间[0,1]上的正交多尺度函数及相应的正交多小波.本文构造的逼近空间Vj[0,1]与相应的小波子空间Wj[0,1]具有维数相同的特点,从而给它的应用带来巨大方便.最后给出重数为2时的[0,1]区间上的正交多小波基构造算例. 相似文献
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杨守志 《数学物理学报(A辑)》2005,25(6):811-820
基于a 尺度正交单尺度函数,分别给出重数为2和3的a 尺度正交多尺度函数的构造算法。并给出对应正交多小波的显式构造。最后给出伸缩因子为3的正交多小波的构造算例。 相似文献
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本文研究了一元α尺度紧支撑、双正交多小波的构造.在区间[-1,1],给出了利用α尺度双正交尺度向量构造α尺度双正交多小波的推导过程得到了一种有效的小波构造算法,并给出了数值算例. 相似文献
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Meyer型正交小波基的构造与性质 总被引:2,自引:0,他引:2
本文基于多分辨分析理论与A.W.W方法将Meyer正交小波的构造规范化,给出其设计方法,并证明此类Meyer型小波母函数ψ(x)及相应的尺度函数ψ(x)具有优良的性质,如速降性O(│x│^-N-1(│x│→∞)、N阶消失矩、线性相位、对称性、频谱有限性、并且双尺度序列(滤波器)hn=ψ(n/2)等,并给出N=2时构造小波函的具体实例。 相似文献
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In this article we present a sufficient condition for orthogonality of decompassable symmetrized tensors. 相似文献
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The concept of a two-direction multiscaling functions is introduced. We investigate the existence of solutions of the two-direction
matrix refinable equation
where r × r matrices {P
k
+
} and {P
k
−
} are called the positive-direction and negative-direction masks, respectively. Necessary and sufficient conditions that the
above two-direction matrix refinable equation has a compactly supported distributional solution are established. The definition
of orthogonal two-direction multiscaling function is presented, and the orthogonality criteria for two-direction multiscaling
function is established. An algorithm for constructing a class of two-direction multiscaling functions is obtained. In addition,
the relation of both orthogonal two-direction multiscaling function and orthogonal multiscaling function is discussed. Finally,
construction examples are given. 相似文献
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An iterative scheme for constructing compactly supported orthonormal (o.n.) multi-wavelets with vanishing moments of arbitrarily
high order is established. Precisely, let φ=[φ1,. . .,φr]⊤ be an r-dimensional o.n. scaling function vector with polynomial preservation of order (p.p.o.) m, and ψ=[ψ1,. . .,ψr]⊤ an o.n. multi-wavelet corresponding to φ, with two-scale symbols P and Q, respectively. Then a new (r+1)-dimensional o.n. scaling function vector φ♯:=[φ⊤,φr+1]⊤ and some corresponding o.n. multi-wavelet ψ♯ are constructed in such a way that φ♯ has p.p.o.=n>m and their two-scale symbols P♯ and Q♯ are lower and upper triangular block matrices, respectively, without increasing the size of the supports. For instance, for r=1, if we consider the mth order Daubechies o.n. scaling function φmD, then φ♯:=[φmD,φ2]⊤ is a scaling function vector with p.p.o. >m. As another example, for r=2, if we use the symmetric o.n. scaling function vector φ in our earlier work, then we obtain a new pair of scaling function vector φ♯=[φ⊤,φ3]⊤ and multi-wavelet ψ♯ that not only increase the order of vanishing moments but also preserve symmetry.
Dedicated to Charles A. Micchelli in Honor of His Sixtieth Birthday
Mathematics subject classifications (2000) 42C15, 42C40.
Charles K. Chui: Supported in part by NSF grants CCR-9988289 and CCR-0098331 and Army Research Office under grant DAAD 19-00-1-0512.
Jian-ao Lian: Supported in part by Army Research Office under grant DAAD 19-01-1-0739. 相似文献
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何永滔 《高等学校计算数学学报》2012,34(1):87-96
1引言众所周知,在实际应用中用小波处理信号时,小波的对称性能使信号避免失真,小波的紧支撑性使得快速小波变换的和是有限和,小波的正交性能够保持能量等等,因而构造 相似文献
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Anders Holmbom Jeanette Silfver Nils Svanstedt Niklas Wellander 《Applications of Mathematics》2006,51(3):247-262
A general concept of two-scale convergence is introduced and two-scale compactness theorems are stated and proved for some
classes of sequences of bounded functions in L
2(Ω) involving no periodicity assumptions. Further, the relation to the classical notion of compensated compactness and the
recent concepts of two-scale compensated compactness and unfolding is discussed and a defect measure for two-scale convergence
is introduced. 相似文献