wavelet transform

The selection of threshold function and determination of decomposition level are two key steps in threshold-based nonlinear filtering by wavelet transform.

阈值函数选择和分解尺度确定是基于阈值的小波域非线性滤波的两个关键步骤。

Wavelet Transform Algorithm and Its Application in Fault Diagnose of Gear and Rolling Axletree

小波分析算法研究及在齿轮与滚动轴承故障诊断中应用

Dual-Tree Complex Wavelet Transform ( DT-CWT ) can provide shift invariance and directional selectivity.

对偶树复小波变换具有良好的方向选择性和平移不变性.

A bit of English Notes wavelet transform, used in calculating the frequency spectrum, suitable for beginners.

带点中文注释的小波变换, 计算频率谱用的, 适合初学者.

Wavelet transform and vector quantization both are important tools of modern image coding.

小波变换和矢量量化都是现代图像编码领域的重要工具.

However, it performs a little worse compared to the conventional Discrete Wavelet Transform ( DWT ) for lossy compression.

而在有损压缩方面, 其效果通常稍逊于传统的离散小波变换(DWT ).

Dispensing with phase shift and sampling a number of images, the introduction of wavelet transform into digital holography can directly eliminate zero-order diffraction image.

将小波变换引入数字全息，可直接消除零级衍射像，无需相移，也不需要采集多幅图像；

Analysis of Natural Annal flow Time Seris in the Upper Reach of the Yellow River Based on Wavelet Transform

基于小波的黄河上游天然年径流变化特性分析

The dyadic wavelet transform utilizes local modulus maximum a wavelet transform to obtain multiscale edges information.

二进小波变换利用模局部极大值来提取图像的多尺度边缘信息.

Naturally, wavelet transform is a band-pass filter, which cannot effectively extract harmonics signal of different frequency at discretion. Moreover, wavelet transform has the disadvantage of spectrum aliasing leakage phenomenon.

小波变换的实质是一个带通滤波过程，不能有效提取出任意频率的谐波信号，会出现频谱混叠现象。

A rotation invariant texture classification algorithm based on log-polar and Dual-Tree Complex Wavelet Transform ( DT-CWT ) is proposed.

提出了一种基于对数 - 极坐标变换(Log-Polar )和双树复数小波变换 ( DT-CWT ) 的旋转不变纹理分类算法.

Then , then basic theories of wavelet transform and some classical wavelet image coding are described.

随后, 介绍了小波变换的基本原理及一些经典的小波图像编码方法.

Aiming at the limitation of traditional wavelet transform, our paper propose a new image fusion novel that after decomposing the image with fast wavelet transform, we use pulse coupled neural networks to choose fusion rule instead of artificial selection.

本文针对传统小波变换存在的缺陷，提出在对图像进行快速小波分解后，通过脉冲耦合模型代替人工选择融合规则，形成的一种基于小波分解和脉冲耦合神经网络的图像融合新方法。

A scheme of embedded wavelet transform image coding using scalar quantization is presented in the paper.

给出了一种基于分层标量量化的二维小波图像压缩编码方案.

The enhancement algorithm based on wavelet transform could extrude mass by adding the plus factor.

再引入增益因子,采用基于小波变换的增强算法突出肿块阴影.

Watermark capacity of image based on AVC and wavelet transform

基于AVC和小波变换的数字图像水印嵌入量的研究

Signal processing for metal magnetic memory testing of borehole casing based on wavelet transform

基于小波变换的套管金属磁记忆检测信号处理

A New Threshold Function De-Noising Method Based on Wavelet Transform

基于小波变换的新阈值函数去噪方法

Digital Watermarking Technique of Image Based on Visibility Threshold Model in Wavelet Transform Domain

基于小波域中视觉门限模型的数字水印技术

A low bit rate image compression algorithm based on edge adaptive wavelet transform is proposed.

为此提出了一种基于边缘自适应小波变换的低比特率图像压缩算法.

Vibration fault feature of gear and rolling axletree is analyzed. By using the decomposition and reconstruction algorithm of wavelet transform, the fault feature signal of gear and rolling axletree are extracted availably and the results of experimentation are obtained.

分析了齿轮与滚动轴承故障振动信号的特征，利用小波变换的分解和重构算法，有效地提取出齿轮与滚动轴承故障特征信号，得到实验结果。

Detection of phase-frequency skip of atomic clock based on wavelet transform

小波变换在原子钟相频跳变检测中的应用

D wavelet transform coding, SPIHT method is used.

3D的小波变换编码, 用的是SPIHT方法.

Early diagnosis for the stress concentration zone of borehole casing pipe by metal magnetic memory and wavelet transform

磁记忆与小波变换相结合的井下套管应力集中早期诊断方法

Time-Frequency Energy Attenuation Factor and Its Application on the Basis of Gauss Linear Modulation Frequency Continuous Wavelet Transform

高斯线调频连续小波变换的时频能量衰减因子方法及其应用

This paper detects the boundaries using wavelet transform method, and recognizes the inside and outside boundaries of ICT image of assembly parts based on simple loops, this algorithm can be applied to reconstruct solid model and analyze the shapes of assembly parts.

用小波变换提取装配体ICT图象中的边界轮廓，提出基于简单环识别装配体ICT图象的内外边界，该算法可用于装配体的结构形状分析并能正确地建立实体模型。

First, apply wavelet transform on a vehicle_license_plate image to denoise it, then threshold the image on condition of keeping the intensity moment invariable.

首先，对车牌图像进行小波去噪，然后利用亮度矩对去噪后的车牌图像进行阈值分割。

Via the threshold operation on wavelet packet transform of images, Gauss color noise can be better filtered, yet there is usually many impulse noise in the images.

通过对图像的子波包变换进行阈值操作，可以较好地滤除高斯白噪声，但图像中往往还含有脉冲噪声，运用中值滤波可以有效地滤除脉冲噪声。

The method for analyzing signal singularity using wavelet transform ( WT), of which the prime function is smooth, is based on the relation of singularity and Lipschitz regularity of signals.

用原函数为光滑曲线的子波变换（简称莫奈特子波变换）检测信号波形奇点的方法是建立在信号奇异性与李普西兹正则性关系基础上的。

Analysis of functional MRI data based on lifting wavelet transform

基于提升小波变换的功能MRI数据分析