查询词典 wavelet

The optimal thresholds and neighboring window sizes are determined for every subband in the wavelet domain using Stein's unbiased risk estimate, and NeighShrink is also extended from orthogonal wavelet transforms to dual-tree complex wavelet transforms in this paper.

该文运用Stein的无偏风险估计，在小波域每一个子带为NeighShrink方法确定一个最优的阈值和邻域窗口，并将NeighShrink方法从正交的小波变换推广到对偶树复数小波变换。

The shift-variant property of the wavelet transform and three-dimension wavelet transform are also discussed in the thesis. And simulation experiment has been made exploringly for the motion estimation using Low-Band-Shift method aim at overcoming the temporal variance of the wavelet transform.

论文还对利用三维小波变换进行视频编码以及小波变换存在的移变性进行了分析讨论，并介绍了克服这种移变性的低子带位移运动估计的方法，探索性地进行了计算机仿真。

In this paper, we define quadratic spline as wavelet, do the two dimentional dyadic wavelet transform on near-infrared galactophore image, and get local modulus maxima from wavelet transforms results----rnodulus and angles, so we can find the blood vessel edge image in each scales, at last, we compute a good edge image which synthesize the characters in each scale.

本文中用二次样条小波作为小波基函数，对乳腺近红外图像进行二维二进小波变换，计算小波变换结果的局部模极大值点，得到各个尺度下的乳腺近红外图像血管的边缘，最后得到综合了各个尺度特征的较好的血管图像的边缘。

Wavelet transform is introduced into the study of scene matching. The first application is to reduce speckle noise in SAR images and the other one is using wavelet_based multiresolution analysis in hierarchical matching. A new nonlinear wavelet transform-morphologic Harr wavelet transform, which suit for hardware realization is presented for matching application.

3将小波变换引入到景象匹配研究之中，研究了两个方面的问题：一是SAR雷达图象的斑点噪声的抑制问题，二是将多分辨分析的思想引入到分层匹配之中，并提出了一种适合于硬件实现的非线性小波—形态学Harr小波变换。

And the programming based on matlab has been completed: overall situation threshold value image compression Based on the bior3.1 wavelet, image two-times compressions and the primitive image 3-times decompositions based on the bior3.7 wavelet, the image compression-encoding and decoding based on the harr wavelet and the huffman coding.

并完成了基于 harr 小波基和 huffman 编码方法的图像压缩编解码的编程。

The wavelet derived by Statistical Homomorphic Deconvolution can be transformed into minmum phase wavelet and zero phase wavelet.

通过大量的地震测线试验，MED准则和PARSIMONY准则求得的最佳反子波是同一个。

According to the meteyard of edge detection and consulting the design-aim of optimal edge-filter, this paper discussed the general rules of selecting the mother function of wavelet used in edge detection, then constructed a quadric B-spline wavelet and presented a method of adaptive thresholds edge detection for image based on wavelet transform.

根据边缘检测的评价标准，参照最佳边缘滤波器的设计要求，确定选择用于边缘检测的小波母函数的一般准则，并在此基础上构造出二次B样条小波，提出了基于小波变换的自适应阈值图像边缘检测的新方法。

The tight wavelet neural network was constituted taking the nonlinear Morlet wavelet radices as the stimulant function. The idiographic algorithm was presented. It can combine the advantages of wavelet analysis and neural networks.

以非线性Morlet小波基作为激励函数，形成神经元，结合小波变换与神经网络各自的优点，建立集小波分析与神经网络于一体的紧致型小波神经网络，并给出了具体的算法。

The simulation results show that the search-optimization capacity of wavelet chaotic neural network has been improved and the reformative wavelet chaotic neural network is superior to the primary wavelet chaotic neural networks.

仿真结果表明，改善了小波混沌神经网络的寻优能力，改进的小波混沌神经网络优于原来的小波混沌神经网络。

The main conclusions are: Mexican hat wavelet is anisotropic one, and it could detect pointlike singularities very efficiently. Morlet and Cauchy wavelet could be used to detect specific directions, and Cauchy wavelet has better direction selectivity than Morlet one. And it has been used to separate the wave field of Ricker. Its results are basically accurate and computation is more efficient.

主要结论有：Mexcian帽小波是各向同性的，主要用来检测点状信号分量，Morlet小波和Cauchy小波主要用来检测方向信号分量，并且Cauchy小波比Morlet小波的方向性要好，检测结果的分辨率要高；利用二维连续小波反变换，以合成的Ricker子波为模拟信号为例进行波场分离，提高了运算效率，实验结果基本上比较准确，还需要实际地震信号的进一步验证。

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。