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浙江大学学报(理学版)  2023, Vol. 50 Issue (6): 761-769    DOI: 10.3785/j.issn.1008-9497.2023.06.011
第15届全国几何设计与计算学术会议专题     
V-系统的快速变换算法
陈伟1(),戚谨雯1,李坚2,宋瑞霞3
1.江南大学 人工智能与计算机学院,江苏 无锡 214122
2.澳门理工大学 应用科学学院,澳门 999078
3.北方工业大学 理学院,北京 100144
A fast algorithm for V-system
Wei CHEN1(),Jinwen QI1,Jian LI2,Ruixia SONG3
1.School of Artificial Intelligence and Computer Science,Jiangnan University,Wuxi 214122,Jiangsu Province,China
2.Faculty of Applied Sciences,Macao Polytechnic University,Macao 999078,China
3.College of Sciences,North China University of Technology,Beijing 100144,China
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摘要:

V-系统是L2[0,1]上的一类完备正交分段多项式函数系,由于其基函数的间断特性,在非连续信号的表达与分析上优势显著。然而,在目前的V-系统变换算法中,对于一个长度为N的信号,不仅需要事先生成并存储一个N阶的正交矩阵,而且其时间复杂度高达Ο(N3)。为实现对大规模数据的高效处理,从V-系统的多分辨率分析角度出发,设计并实现了V-系统的快速分解与重构算法,不仅无须存储额外信息,而且其时间复杂度仅为Ο(N)。测试结果表明,提出的快速算法能够满足大规模数据高效处理要求,为V-系统在更多领域的应用奠定了基础。

关键词: V-系统多分辨率分析双尺度方程多小波快速算法    
Abstract:

V-system is a kind of complete orthogonal piecewise polynomial function system on L2[0,1], because of the discontinuous nature of its basis functions, it has significant advantages in the expression and analysis of discontinuous signals. However, in the current V-system transformation algorithm, for a signal with a length of N, it not only needs to generate and store an N-order orthogonal matrix in advance, but also its time complexity is as high as Ο(N3). Therefore, in order to adapt to the efficient processing needs, this paper designs and implements a fast decomposition and reconstruction algorithm for V-systems from the perspective of multi-resolution analysis of V-systems. This fast algorithm does not need to store additional information, and its time complexity is only Ο(N2). The test results show that the fast algorithm proposed in this paper can meet the requirements of high-efficiency processing of large-scale data, which lays the foundation for the application of V-system in more fields.

Key words: V-system    orthogonal    resolution analysis    double scale equation    multi wavelet    fast algorithm
收稿日期: 2023-06-21 出版日期: 2023-11-30
CLC:  TP 391  
作者简介: 陈伟(1986—),ORDID:https//orcid.org/0009-0002-2728-494X,男,博士,副教授,主要从事计算机图形学研究,E-mail:chenwei.must@gmail.com.
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引用本文:

陈伟,戚谨雯,李坚,宋瑞霞. V-系统的快速变换算法[J]. 浙江大学学报(理学版), 2023, 50(6): 761-769.

Wei CHEN,Jinwen QI,Jian LI,Ruixia SONG. A fast algorithm for V-system. Journal of Zhejiang University (Science Edition), 2023, 50(6): 761-769.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2023.06.011        https://www.zjujournals.com/sci/CN/Y2023/V50/I6/761

kV系统
注释

尺度空间V0

?k0x,?k1x,?????,?kkx

小波空间W0

ψk,00,0x,ψk,00,1x,?????,ψk,00,kx

小波空间W1

ψk,1j,ix=2ψk,00,i(2x-j),????xj2,j+12,0,????,

i=0,1,2,?,k;j=0,1

小波空间W2

ψk,2j,ix=2ψk,00,i(4x-j),????xj4,j+14,0,????,

i=0,1,2?,k;j=0,1,2,3

小波空间Wn

ψk,nj,ix=2ψk,00,i(2nx-j),????xj2n,j+12n,0,????,

i=0,1,2?,k;j=0,1,3?,2n-1

0
1
2
3
表1  在区间[0, 1]的k次完备正交V-系统
变换层数n信号长度运行时间/s
传统算法本文算法
51280.0150.000 50
62560.0380.000 56
75120.1350.000 78
81 0241.050.000 67
92 04856.850.000 73
104 096203.30.001 60
118 1921 709.540.003 70
1216 38412 876.130.009 00
表2  不同信号长度算法的运行时间
图1  等高线簇图形
图2  等高线簇的精确重构结果
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