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Mallat‘s decompositon and reconstruction algorithms are very important in the the field of wavelet theory and its applications to signal processing.Wavelet Anal-ysis,which is based on L^2(R) space,can eliminate redundancy of signals with the help of orthogonality and characterize the processing precision with the meansquare error.In the recent years,it is understood that the mean square measuredoes not match human visual sensitivity well.From the point of view,R.DeVore studied L^1 measure instead.Similarly,considering the principles of image com-pression,Yang introduced and dealt with orthogonality in L^1 space based on thebest approximation theory,and consequently established the corresponding decom-position and reconstruction algorithms for signals.In this paper,error analyses for the algorithms above are taken and the selection of the best parameters in the algorithms are discussed in detail.Finally,the algorithms are compared with the classical Haar and Daubechies‘‘s orthogonal wavelets based on the singal-to-noiseratio data computed. 相似文献
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本文给出并证明了[1]中可数模空间ε(Ω)的定义对紧子集列{Km}∞m=1的依赖条件,提出了与紧子集列{Km}∞m=1的选择无关的ε(Ω)的修正定义. 相似文献
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本文对[1]中动力系统(du)/(dt)=F(u)的锥性质定理提出几点注记,说明定理中的锥Hγ与通常锥的异同. 相似文献
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本文构造了一个新的分布空间D′H, 并且把经典的Hilbert变换的定义 推广到这个空间上. 证明了推广的Hilbert变换是把空间D′H映射到自身的 同胚映射, 且D′H是满足该条件的D′的最大子空间. 进一步, 证明了Lp空间中经典的Hilbert变换和周期函数空间中周期Hilbert变换都是这一推广Hilbert变换的特款. 对空间DH的性质进行了刻画, 并给出了空间D′H中的一类非常有用的非线性相位信号. 最后给出了该推广Hilbert变换的两个简单的应用. 相似文献
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杨力华 《数学年刊B辑(英文版)》1991,(2)
The author gives some disagreement to the following result,which is published in [1].Let {L_n(f(}be mass-concerntative,φ_n→0+(n→∞),0<α≤2 andC~(-1)≤(φn+1)/(φn)≤C(n=1,2,…)for some constrant C>0.Then for any f∈C[-2a,2a],||L_n(f)-f||σ[-a,a]=O(φ_n~α)implies f∈Lip*α,whereLip*a={f∈C[-2a,2a]|w_2(f,δ)[-2a,2a]=O(δ~α)}.Then some similar results on C_(2π)are given,and further some results on C[-2a,2a]areestablished by adding some proper conditions. 相似文献
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本文引入了 A-拟正算子的概念,并建立了其 Korovkin 型逼近定理。这一结果包含了文敞[1]—[4]的几乎所有定理作为特款。而且本文的证明很简洁。 相似文献
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本文建立了拟模Abelian群上双参数算子族逼近的外推定理,所得的结果包含了DeVoreR.等人对正规逼近族之最佳逼近所建立的外推定理,且所需的条件更弱.同时从本文的结果立即可以建立起算子逼近的外推定理. 相似文献
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