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检索条件"主题词=Cascade Algorithm"
54 条 记 录,以下是21-30 订阅
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Positivity of refinable functions defined by nonnegative finite masks
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APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS 2009年 第2期27卷 133-156页
作者: Zhou, Xinlong Univ Duisburg Essen Dept Math D-47048 Duisburg Germany
Let (a(j) vertical bar j = 0, 1, ..., N) with a(0), a(N) not equal 0 be a given nonnegative mask. Assume that the subdivision scheme with this mask is convergent. Let the associated refinable function be phi. So the s... 详细信息
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cascade algorithm and multiresolution analysis on the Heisenberg group
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Progress in Natural Science:Materials International 2005年 第7期15卷 602-608页
作者: LIU Heping, LIU Yu, PENG Lizhong and CHU Xiaoyong (LMAM, School of Mathematical Sciences, Peking University, Beijing 100871, China) LMAM School of Mathematical Sciences Peking University Beijing 100871 China
In this paper we investigate the relationship between the convergence of cascade algorithm and orthogonal (or biorthogo-nal) multiresolution analysis on the Heisenberg group. It is proved that the (strong) convergence... 详细信息
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Pointwise convergence of bounded cascade sequences
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PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY 2007年 第1期135卷 181-189页
作者: Chen, Di-Rong Han, Min Beijing Univ Aeronaut & Astronaut Dept Math Beijing 100083 Peoples R China Beijing Univ Aeronaut & Astronaut LMIB Beijing 100083 Peoples R China
The cascade algorithm plays an important role in computer graphics and wavelet analysis. For an initial function phi(0), a cascade sequence (phi(n))(n=0)(infinity) is constructed by the iteration phi(n) = C-a phi(n-1)... 详细信息
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Computational methods for integrals involving functions and Daubechies wavelets
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APPLIED MATHEMATICS AND COMPUTATION 2007年 第2期189卷 1828-1840页
作者: Maleknejad, K. Yousefi, M. Nouri, K. Iran Univ Sci & Technol Sch Math Tehran 16844 Iran Islamic Azad Univ Tehran Iran Iran Univ Sci & Technol Sch Math Tehran 16844 Iran
When wavelets are used as basis functions in Galerkin approach to solve the integral equations, Integrals of the form integral(supp(theta j,k))f(x)theta(j,k)(x) dx occur. By a change of variable, these integrals can b... 详细信息
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Multiscale edge detection of noisy images using wavelets
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Journal of Harbin Institute of Technology(New Series) 2007年 第5期14卷 737-740页
作者: FAROOQ M College of Automation Engineering Nanjing University of Aeronautics & Astronautics
The classical edge detectors work fine with the high quality pictures, but often are not good enough for noisy images because they cannot distinguish edges of different significance. The paper presented a novel approa... 详细信息
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Convergence of cascade algorithms by frequency approach
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JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS 2006年 第1期314卷 335-344页
作者: Chen, DR Beijing Univ Aeronaut & Astronaut Dept Appl Math Beijing 100083 Peoples R China
Starting with an initial function phi(0), the cascade algorithm generates a sequence {Q(a)(n)phi(0)}(infinity)(n=1) by a cascade operator Q(a) defined by Qa f = Sigma(alpha is an element of Zd) a(alpha) f (M (.)-alpha... 详细信息
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A cascade optimization methodology for automatic parameter identification and shape/process optimization in metal forming simulation
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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2006年 第41-43期195卷 5472-5508页
作者: Ponthot, J-P. Kleinermann, J-P. Univ Liege LTAS MC&T B-4000 Liege Belgium
Computer simulations of metal forming processes using the finite element method (FEM) are, today, well established. This form of simulation uses an increasing number of sophisticated geometrical and material models, r... 详细信息
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Solutions in Sobolev spaces of vector refinement equations with a general dilation matrix
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ADVANCES IN COMPUTATIONAL MATHEMATICS 2006年 第1-4期24卷 375-403页
作者: Han, B Univ Alberta Dept Math & Stat Sci Edmonton AB T6G 2G1 Canada
In this paper, we present a necessary and sufficient condition for the existence of solutions in a Sobolev space W-p(k)(R-s) ( 1 0. This paper generalizes the results in R. Q. Jia, K. S. Lau and D. X. Zhou (J. Fourie... 详细信息
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On refinable functions and subdivision with positive masks
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ADVANCES IN COMPUTATIONAL MATHEMATICS 2006年 第1-4期24卷 281-295页
作者: De Villiers, J Univ Stellenbosch Dept Math ZA-7602 Matieland South Africa
We consider aspects of the analysis of refinement equations with positive mask coefficients. First we derive, explicitly in terms of the mask, estimates for the geometric convergence rate of both the cascade algorithm... 详细信息
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The collocation method for Hammerstein equations by Daubechies wavelets
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APPLIED MATHEMATICS AND COMPUTATION 2006年 第2期172卷 846-864页
作者: Maleknejad, K Derili, H Iran Univ Sci & Technol Sch Math Tehran 16844 Iran Islamic Azad Univ Fac Sci Karaj Unit Dept Math Karaj *** Iran
The numerical solutions to the nonlinear integral equations of Hammerstein-type y(t) = f(t)+ integral(1)(0) k(t, s)g(s, y(s))ds, t is an element of [0, 1] with using Daubechies wavelets are investigated. A general ker... 详细信息
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