共查询到19条相似文献,搜索用时 46 毫秒
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引入了一类新的积分变换,即对称变换。这类变换在空间域和空间频率域中实现的变换操作是相同的。换句话说,如果一个积分变换器对信号本身及其Fourier频谱作相同的变换操作,那么这种变换即为对称变换。给出了对称变换的成立条件,即当积分变换核是所谓的类自Fourier变换函数时,此变换即为对称变换。并提出了类自Fourier变换函数的一种构造方式。同时还指出,光学中的分数Fourier变换即是一种对称变换。 相似文献
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结合小波域变换和空间域变换的图像增强方法 总被引:2,自引:0,他引:2
提出了一种结合了小波域和空间域处理方法的图像增强算法. 该算法首先对小波域中的高频系数进行修正,使图像具有更好的局部对比度和更丰富的细节,由于双树复小波变换(Dual-tree Complex Wavelet Transform,DT CWT)具有更好的方向选择性,在小波变换的过程中选用了这一方法;然后,通过空间域中的非线性变换,调整图像的整体对比度. 该算法可根据图像本身的特性实现参数的自动选择. 经过本文方法的处理所得的图像,无论在视觉效果上还是在统计上,都优于前人工作的结果. 相似文献
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利用静轴对称SDYM场方程的Lax对的解,我们构造出了静轴对称SDYM场的一种新的对称变换. 相似文献
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MODELING AND SCALING OF CHIELECTRIC RELAXATION OF NONLINEAR OPTICAL POLYMERS IN FREQUENCY DOMAIN 下载免费PDF全文
chielectric relaxation theory was demonstrated, chielectric relaxation that selectively probes chromophore reorientation in the frequency domain was described by the Havriliak Negami(HN) function, chielectric spectra of several nonlinear optical (NLO) polymers were fitted well by the HN function. To describe the scaling of chromophore reorientation relaxation in frequency domain, two-shape parameters m and n describing the low- and high- frequency wings of the chielectric spectra need to be specified, besides the chielectric characteristic relaxation time τ and the chielectric strength Δχ(2). From the temperature dependences of m and n of NLO polymers, the relations between the chromophore relaxation and the a relaxation of the polymer host have been revealed. 相似文献
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本文在介绍UHB(Ulirasound Holography B-scan)成像方法的同时,提出了一种新的频域补偿原理。利用这种原理,可以在成象的重建过程中对各种已知的与声传播方向有关的畸变进行补偿。文中给出了一个对不同声速的平面层进行补偿的例子。计算机模拟以及水槽试验均获得了满意的结果。 相似文献
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本文对频域光存储中影响存储密度和读写速率的因素进行探讨,对实现高密度存储和高速数据传输所要求的材料特性和读写条件进行深入的分析,得到的最佳参量空间将为频域光存储的系统研究提供理论依据。 相似文献
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运用空间域和频率域方法讨论了阿贝-波特实验和空间滤波实验中光波分别经过"4f系统"、双透镜系统(两种)和单透镜系统时透镜的傅里叶变换和物体的频谱,分析了空间滤波实验中光路和傅氏透镜孔径对实验的影响. 相似文献
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全对称傅里叶透镜的设计 总被引:1,自引:0,他引:1
本文研究了傅里叶透镜的设计,并叙述了一种对称型傅里时变换透镜.在相对孔径1:10时,输入面和频谱面处的象质均较好.傅里叶交换透镜的特点是必须对两对物象共轭位置(即位于前焦面处的输入面和位于后焦面处的频谱面)控制除畸变以外的全部象差.1969年后开始出现的傅里叶变换透镜,多属6~8片的对称或近似对称的四组元双远距型,本文叙述了一种严格对称型四片傅里叶交换透镜. 相似文献
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PREPARATION OF STRIPE-SHAPED DOMAIN STRUCTURE IN FERROELECTRIC LIQUID CRYSTAL AND THE FABRICATION OF SPATIAL LIGHT MODULATOR 下载免费PDF全文
The stripe-shaped domain (SSD) structure was prepared in the initial ferroelectric liquid crystal (FLC) alignment without the application of an external electric field, which was realized by the aligning layer modification through the doping of tin tetra-2, 4-dimethyl phenoxy phthalocyanine (SnPc) into the rubbed polyimide films. Atomic force microscopy was used to investigate the alignment films and the corresponding aligning ability was evaluated through the pre-tilt angle measurement. The memory capability and the contrast ratio of thus aligned SSFLC cells have been enhanced and improved with the appearance of the SSD structure. The electrically controlled 64×64 FLC spatial light modulator was fabricated using the improved ligning method, which proves valuable for the practical device fabrication. 相似文献
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D.E. ADAMS 《Journal of sound and vibration》2002,250(5):935-950
Non-linear dynamic systems respond at frequencies other than the excitation frequency; however, standard frequency response function estimators for linear systems do not accommodate this harmonic distortion. A new multi-harmonic frequency response function estimator that utilizes discrete frequency models for non-linear systems is introduced here. The multi-harmonic estimator relates the frequency response at each frequency to the input and output spectra within a given frequency band in the same way that autoregressive exogenous input models relate inputs and outputs at particular samples in the time domain. Overdetermined, least-mean-squares calculations are used to minimize model error throughout a frequency band rather than at a single frequency as in the corresponding linear estimators. The resulting multi-harmonic frequency response function models are non-parametric (e.g., vary with amplitude) when linear functions are used and parametric when non-linear functions are used. A new sensitive indicator for experimentally characterizing non-linearity is introduced. 相似文献