查询词典 wavelets

Research has been made on the airgun principle and its testing strategy, then we simulated the wavelets in both near field and far field of the airgun source on the Ziolkowski model basis, and the analysis on its energy and P/R at different depths is given.

本文针对滩浅海地震勘探的难点问题，特别是滩浅海地震资料信噪比、分辨率低，干扰严重的问题，在滩浅海地震勘探野外采集方面取得了较大进展。

The conception of'physical wavelets'was first introduced by Gerald Kaiser, who had expended real signal to complex Hilbert space by analytic signal transform.

Gerald Kaiser首度提出了"物理小波"的概念，并通过解析信号变换将这一概念拓展到Hilbert空间。

Characters of soil or rock、spectrum properties of input wavelets、angle of incidence et al.

场地特性包括地形的特征尺寸如坡度和高度、介质的性质等，输入地震动特性包括输入地震波的频谱特性、入射角度等。

Accordingly a new kind of orthogonal or almost orthogonal, symmetric, antisymmetric and linear phase wavelets are constructed.

本文称这些新子波为超高斯谱子波。

Combining the definition of CWT and the derivative property of convolution, we constructed a general method to calculate the approximate derivative of signal through CWT by using the first and second derivative of Gaussian function, Haar, and the first derivative of three-order-Spline function as wavelets. As compared with the other approaches of calculating derivative, which include the numerical differentiation, polynomial filters, Fourier transform, and the recently proposed DWT method, fast calculation and simple mathematical operation were remarkable advantages of CWT method. For the signal corrupted by severe noise (Signal-toNoise Ratio=5), the satisfactory results could also obtained via CWT method through appropriately adiusting the dilations.

在此基础上，(1)结合连续小波变换的特点和卷积的微分性质，提出了使用Gaussian函数的一阶和二阶导数，Haar和三次样条函数的一阶导数作为小波函数的连续小波变换计算信号近似导数的一般性方法，与其他导数计算方法(包括数字微分法，多项式滤波法，Fourier变换法和离散小波变换法)相比，本法简单便捷，计算速度快，对于噪声含量较高的信号(S/N为5)，只要适当调节尺度即可获得比较满意的结果。

First of all, introduce the Fourier analysisand wavelets analysis, two methods of non-linear function approximation of the effect ...

第二章介绍了图像去噪的知识和各种去噪方法，着重介绍了阈值去噪和相关的阈值取法。

This paper focuses on the construction of true bidimensional wavelets by lifting scheme and the relevant image coding. We research the nonseparable bidimensional interpolator designed by different standards, carry out the true bidimensional wavelet decomposition and improve the SPIHT coding in order to adapt to the characteristic of true bidimensional wavelet decomposition. It is proved by experiments that the subjective and objective quality of binary tree SPIHT on true bidimensional wavelet decomposition is better than famous 9/7 wavelet under the condition of low bits compression.

本文以基于提升格式的纯二维小波滤波器组的构造为中心，研究了不同类型的二维不可分离内插滤波器，实现了图像的纯二维小波分解，并改进了SPIHT编码算法，使其适合纯二维小波的分解特点，实验证明在低比特压缩下，纯二维小波分解的二叉树SPIHT在主观和客观质量上要好于著名的9/7小波。

Therefore,in order to acquire satisfactory outcoming with analyzing and processing the signal precisely, it is not enough to use only two-band wavelets, and M-band wavelets is needed.

所以，在大量的实际应用中，需要对信号作更为精细的分析和处理以得到更为满意的效果，仅仅考虑2带小波是不够的，还需要进一步使用多带小波。

Compared with the existed interpolating wavelets, GIWs are biorthogonal interpolating wavelets with compactly supported duals, and are completely determined by a pair of interpolating filters, thus, have flexibility in design.

与传统的内插小波系统相比，它是一种具有紧支撑对偶的双正交小波系统，由一对插值滤波器完全确定；因此，在设计上具有很大的灵活性。

In chapter 6, composite wavelets is first put forward and used to design digital filter by the author, this filter based on composite wavelets has the flattest band pass performance.

从小波良好的带通滤波性能出发，首次提出组合小波的概念，并用于数字滤波器的设计，得到了具有最平坦通带特性的组合小波滤波器。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。