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小波工具箱的应用基础 395
16.1 一维小波分析的应用 395
16.1.1 小波分解在普通信号分析中的应用 395
16.1.2 小波变换在信号特征检测中的应用 411
16.2 二维小波分析的应用 417
16.2.1 小波分析在图像平滑中的应用 417
16.2.2 小波分析在图像增强中的应用 418
16.2.3 小波分析在图像融合中的应用 420
16.3 小波包分析的应用 422
16.3.1 小波包在信号时频分析中的应用 423
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提出了一种离散小波变换域实现图像水印的方法。这种算法充分利用小波变换的特点,把原始图像及水印图像塔式分解,在多分辨率分解后的相同的频段来嵌入水印信息。该方法也利用了人眼视觉特性,算法简单而有效。实验证明,该算法较好地解决了水印不可见性与鲁棒性之间的矛盾,对常见的水印攻击都有较强的鲁棒性。-presents a discrete wavelet transform domain image watermarking method. This algorithm using wavelet tran
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本例程主要演示了一维小波变换,小波算法是一种基于时域到频域的变换,可以得到信号频率和时间的关系。-The main demonstration of the routine of one-dimensional wavelet transform, wavelet-based algorithm is a time-domain to frequency domain transform, the signal can be frequency and time.
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In mathematics, the discrete Fourier transform (DFT) is one of the specific forms of Fourier analysis. As such, it transforms one function into another, which is called the frequency domain representation, or simply the DFT, of the original function
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利用MATLAB强大的图形处理功能,符号运算功能和数值计算功能,实现连续时间非周期信号频域分析的仿真波形;
1、用MATLAB实现典型非周期信号的频域分析;
2、用MATLAB实现信号的幅度调制;
3、用MATLAB实现信号傅立叶变换性质的仿真波形;
-The use of MATLAB powerful graphics processing capabilities, symbolic computing and numerical computing capabilitie
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HHT(hilbert Huang-transfrom)可以实现同时对信号的时频分析,得到信号的Hilbert时频谱和能量谱,-HHT (hilbert Huang-transfrom) can achieve the same time, the time-frequency analysis, when the signal spectrum and Hilbert energy spectrum
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The real and imaginary components of a complex Gabor filter are phase sensitive,
i.e., as a consequence their response to a sinusoid is another sinusoid (see Figure
1.2). By getting the magnitude of the output (square root of the sum of squared
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实用LabVIEW软件 实现短时傅里叶变换。实现对数据的时频分析-La-LabVIEW software utility short time Fourier transform. To achieve time-frequency analysis of the data-La
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实用LabVIEW软件 实现短时傅里叶变换。实现对数据的时频分析-La-LabVIEW software utility short time Fourier transform. To achieve time-frequency analysis of the data-La
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Coefficients a and b control the low and high frequency ranges that the watermark affects. Because of the watermark invariant properties, we embed the watermark only in the Fourier descr iptor magnitude. We use the inverse Fourier transform of the Fo
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研究了经验模态分解与希尔伯特变换相结合的提取信号瞬时特征的EMD/HS法,并对其性能进行了分析-EMD/HS method to study the transient characteristics of the empirical mode decomposition and Hilbert transform combining the extracted signal, and its performance is analyzed
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提出了一种基于小波变换和模糊集的图像融合算法.其基本思想是: 首先对图像进行小波变换,获得图
像的低频和高频分量 随后在融合过程中, 对低频和高频分量采取不同的融合策略, 即对低频分量采用平均能
量法进行融合,对高频成分利用图像的模糊集, 寻求一个模糊隶属函数作为融合算子进行融合 最后再对融合
后的图像进行小波反变换,重构出融合后的图像.实验结果证明了方法的有效性.-Proposed image fusion algorithm based on wavelet transform
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脑神经网络信号的离散余弦分类。所谓分类就是一种模式识别。按照某个特定标准(如距离准则)把一个数据集分割成不同的类或簇,分类后同一类的数据尽可能聚集到一起,不同数据尽量分离。而离散余弦变换是一种用来数据压缩的正交变换。所谓数据的压缩实际上就是通过丢失能量较小高频分量,保留能量较高的低频分量,从而达到压缩的目的。-Brain network signal discrete cosine classification. The so-called classification is a kind of
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傅里叶时域频域变换图形处理S参数在时域的应用-Fourier time domain frequency domain transform graphics processing S-parameters in the application of the time-domain
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基于FPGA的高性能离散小波变换设计,本设计在最高处理速度方面具有明显的优势。在此基础上,考虑到通用性的要求,本文还设计了一种小波种类可选、小波阶数可调的通用小波变换FPGA架构,该通用小波正、反变换系统的最高时钟频率分别为114.10 MHz、152.09 MHz。此结构具有通用性强的特点,可高性能实现多种小波变换。-Design high-performance FPGA-based discrete wavelet transform, this design has obvious ad
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针对传统液位测量系统精度低、抗干扰能力差、接触式的特点,介绍一种利用雷达原理研制的数字式液位测量系统。本系统采用调频测量法,用C8051F020单片机作为频率测量模块的核心。运用自相关函数对信号进行滤波 快速傅里叶变换(FFT)算法进行频域分析 移频法对频率进行细化,最后得到液位的高度。该系统具有很强的适应能力和完善的接口,在实测中取得了满意的精度。 -Traditional level measurement system accuracy, anti-jamming capability,
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时频分析简单例程,WV和短时变换程序.代码简便,保证可以应用-Time frequency analysis of simple routines, WV and short-time transform program
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This is matlab code for stockwell transform as a time frequency distribution for feature extraction that was developed by Doctor stockwe-This is matlab code for stockwell transform as a time frequency distribution for feature extraction that was dev
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分数复利叶变换 用于测量距离和信号压缩 使用广泛-Calculation of the Fractional Fourier Transform
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This code computes the Stockwell transform (S-Transform) of a one dimensional series
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