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随机栅
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  random gratings
     A mathematical description for considering a speckle gram as superposition of random gratings is proposed, wholefield speckle analysis by moire theory is treated, and a fringe formula which conforms to physical process is obtained. The relation between fringe visibility tested piece deformation and filtering aperture as well as the properties of secondary speckle are discussed.
     提出把散斑图看成随机栅迭加的概念,用moire方法建立了散斑全场分析的数学描述,得出与物理过程相符的条纹公式,并对散斑条纹对比度与试件变形量、滤波孔的关系、散斑条纹图上的二次散斑性质作了讨论。
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     Random pulse generator
     随机脉冲发生器
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     A Random Pulse Generator
     随机脉冲发生器
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     Electronic Safety Railings
     电子安全
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     The Grid-Lines Design of Solar Cells
     太阳电池线的设计
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  random gratings
1.Honey bees (Apis mellifera, worker) were trained to discriminate between two random gratings oriented perpendicularly to each other.
      


A mathematical description for considering a speckle gram as superposition of random gratings is proposed, wholefield speckle analysis by moire theory is treated, and a fringe formula which conforms to physical process is obtained. The relation between fringe visibility tested piece deformation and filtering aperture as well as the properties of secondary speckle are discussed.

提出把散斑图看成随机栅迭加的概念,用moire方法建立了散斑全场分析的数学描述,得出与物理过程相符的条纹公式,并对散斑条纹对比度与试件变形量、滤波孔的关系、散斑条纹图上的二次散斑性质作了讨论。

In this paper, we present a kind of wavelet filter approximating method based on lattice structure. By virtues of the properties of the lattice structure, two processes, step-by-step lattice optimization and random lattice optimization, are adopted to construct wavelet filters. During the step-by-step lattice optimization, we give two selections: throw-out principle and remained principle, and the two selections are proved to be equivalent to each other. Thus the throw-out principle can ensure that our optimization...

In this paper, we present a kind of wavelet filter approximating method based on lattice structure. By virtues of the properties of the lattice structure, two processes, step-by-step lattice optimization and random lattice optimization, are adopted to construct wavelet filters. During the step-by-step lattice optimization, we give two selections: throw-out principle and remained principle, and the two selections are proved to be equivalent to each other. Thus the throw-out principle can ensure that our optimization algorithm is optimal in each step. And we also extend the kind of method to construct wavelet filter banks with different length. In this paper, the algorithm is successfully applied in the following problem: constructing two channel orthogonal wavelet filter banks close to linear phase and constructing signal-adapted wavelet filter banks with finite impulse responses (Principal Component Filter Banks). Parts of results in the step-by-step optimization have been accepted by IEEE ICIP2003.

提出一种基于栅格结构的小波滤波器逼近方法·应用栅格结构的特性,采用分步栅格优化和随机栅格优化两个过程来构造小波滤波器·在分步栅格优化中,提出两种优化策略:扔掉和保留;并证明这两个优化策略是等价的,这样可以采用扔掉策略也可以保证我们每步优化是最优的·同时,将这种构造算法推广到不同长度滤波器构造,也成功地将该算法应用到以下问题:构造二通道接近线性相位的正交小波滤波器和有限脉冲的信号自适应小波滤波器(主分量滤波器)·另外,分步栅格优化的部分结果已经出现在IEEEICIP2003上·

 
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