摘要
传统的Fourier级数在逼近间断信号时因Gibbs现象的干扰,会产生比较大的误差。针对此问题,国内学者齐东旭教授带领的课题组提出了非连续正交函数系的研究课题,其中U-系统和V-系统是两类典型的非连续完备正交函数系。从数学理论上来说,U-系统和V-系统分别是对著名的Walsh函数和Haar函数由分段常数向分段k次多项式进行推广的结果,其最重要的特点是函数系中既有光滑函数又有各个层次的间断函数。因此,U,V-系统可以处理连续和间断并存的信息,在一定程度上弥补了Fourier分析和连续小波的缺憾。本文从理论与应用2个方面对U,V-系统进行了综述。在理论方面,首先介绍了单变量U-系统与V-系统各自的构造方法,其次介绍三角域上U,V-系统的构造方法,最后介绍U,V-系统的主要性质。在应用方面,介绍了若干具有代表性的应用案例。
The traditional Fourier analysis and continuous wavelet method will produce relatively enormous errors due to the interference of Gibbs phenomenon. To solve this problem, Qi Dongxu proposed the research topic of discontinuous orthogonal function systems, among which U-system and V-system are two typical discontinuous complete orthogonal function systems. In terms of the mathematical theory, U-system and V-system are the results of the extension of the well-known Walsh function and Haar function from piecewise constant to piecewise k degree polynomial, respectively. The most important feature of U-system is that there are both smooth functions and discontinuous functions at various levels in the function system. Therefore, U-and V-systems can process both continuous and discontinuous information, making up for the shortcomings of Fourier analysis and continuous wavelet to a certain extent. This paper reviewed U-and V-systems from two aspects: theory and application. Theoretically,firstly, the construction methods of univariate U-system and V-system were introduced, respectively, then the construction methods of V-system on triangular domain were introduced, and finally the main properties of U-and V-systems were introduced. In terms of application, some representative cases of applications were introduced.
作者
陈伟
蔡占川
李坚
梁延研
熊刚强
宋瑞霞
CHEN Wei;CAI Zhan-chuan;LI Jian;LIANG Yan-yan;XIONG Gang-qiang;SONG Rui-xia(School of Artificial Intelligence and Computer Science,Jiangnan University,Wuxi Jiangsu 214122,China;School of Computer Science and Engineering,Macao University of Science and Technology,Macao 999078,China;Faculty of Applied Sciences,Macao Polytechnic University,Macao 999078,China;School of Information Engineering,Guangdong Medical University,Dongguan Guangdong 523808,China;College of Sciences,North China University of Technology,Beijing 100044,China)
出处
《图学学报》
CSCD
北大核心
2022年第6期1002-1017,共16页
Journal of Graphics
关键词
U-系统
V-系统
正交函数
非连续
频谱分析
U-system
V-system
orthogonal function
discontinuity
spectral analysis
