共查询到19条相似文献,搜索用时 46 毫秒
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小波分析方法及其应用 总被引:2,自引:0,他引:2
2.正交小波和多分辨分析前面已经指出,连续小波变换和离散小波变换具有统一的形式,特别是正交小波的引入,使一个小波函数的“伸缩”和“平移”产生的函数族构成函数空间L2(R)的一个标准正交基,这给信号分析和一般的数据处理带来许多方便。这样就产生一个问题:... 相似文献
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小波在微分方程数值解上的应用 总被引:2,自引:0,他引:2
求解微分方程常见的方法包括有限差分、有限元等.近年来,小波理论迅速发展,用小波方法数值解求解微分方程已越来越引起人们的注意.本文引入小波的基本理论,通过将函数及其各阶导数在小波基上的展开,求解微分方程的数值解. 相似文献
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我们考虑问题K(x)uxx=ua.0<X〈1,t≥0,其中K(x)≥a≥0,u(0,t)=g,ix(0,t)=0.这是一个不适当的方程,因为当解存在时在边界g上一个小的扰动将对它的解造成很大的改变.我们考虑存在解u(x,·)∈L^2(R)用小波伽辽金方法和Meyer多分辨分析去滤掉高频部分,从而在尺度空间Vj上得到适定的近似解.我们也可以得到问题的准确解与它在Vj上的正交投影之间的误差估计. 相似文献
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定义了二维Haar尺度函数,构造了长方形区域上的二维非均匀Haar小波函数,给出了非均匀 Haar 小波的分解和重构公式,最后得到了单值重构算法. 相似文献
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本文研究了矩形域上的双正交小波,并利用此小波压缩分割的图像得到了矩形域上的正交多分辩分析与多尺度空间和相应的尺度函数和小波函数. 相似文献
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本文通过两个例子说明如何根据偏微分方程定解问题的特点,选择合适的小波函数,使在一定的精确度的保证下,尽量缩短计算时间. 相似文献
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强非线性问题的改进的L-P解法 总被引:12,自引:0,他引:12
用改进的L-P法求解了一类平方强非线性自由振动问题和一类非振动型的强非线性问题,得到了精度很好的一级近似解,方法与通用的改进的L-P法稍有不同。 相似文献
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Let E=(1 1 1 -1) or (0 1 2 0). A measurable function v is called an E-waveletmultiplier if (rψ)v is an E-wavelet whenever ψ is an E-wavelet. Some characterizations and applications of E-wavelet multiplier were considered in [1]. In this paper, we give some other applications of E-wavelet multiplier, and prove that the set of all MRA E-wavelets is arcwise connected. 相似文献
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Dong-Myung Lee Jung-Gon Lee Sun-Ho Yoon 《Proceedings of the American Mathematical Society》2002,130(12):3555-3563
In this paper we present a versatile construction of multiresolution analysis of two variables by means of eigenvalue problems of the integral equation, for . As a consequence we show that if is the solution of the equation with , then constructs a two-variable multiresolution analysis.
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We study the action of translation operators on wavelet subspaces. This action gives rise to an equivalence relation on the
set of all wavelets. We show by explicit construction that each of the associated equivalence classes is non-empty. 相似文献
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本文考虑一般细分方程ψi(x)=Σ1≤j≤NΣk∈Zcij(k)ψj(2x-k),解的存在性,正则性和稳定性,及{ψi}1≤i≤N产生L^p多分辨率分析的条件。 相似文献
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In this paper, spectral graph wavelet optimized finite difference method (SPGWOFD) has been proposed for solving Burger's equation with distinct boundary conditions. Central finite difference approach is utilized for the approximations of the differential operators and the grid on which the numerical solution is obtained is chosen with the help of spectral graph wavelet. Four test problems (with Dirichlet, Periodic, Robin and Neumann's boundary conditions) are considered and the convergence of the technique is checked. For assessing the efficiency of the developed technique, the computational time taken by the developed technique is compared to that of the finite difference method. It has been observed that developed technique is extremely efficient. 相似文献