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xiaobobaofenjie
- 本程序重构各层低频和高频系数,画功率谱,横坐标为频率,纵坐标为功率,小波包分解最后一句是为显示小波包四层分解树结构-Reconstruction of the procedural layers of low and high frequency coefficients, draw power spectrum, the abscissa is the frequency, the vertical axis is power, wavelet packet decomposition is
matlab1
- 我们知道,小波变换的一级分解过程是,原始信号分别进行低通、高通滤波,再分别进行二元下抽样,就得到低频、高频(也称为平均、细节)两部分系数;而多级分解则是对上一级分解得到的低频系数再进行小波分解,是一个递归过程。以下是一维小波分解的程序. -We know that a wavelet transform decomposition process is that the original signal were low-pass, high pass filter, and then
MyDwt2D
- 对图像进行二维离散小波变换, 变换级数大于等于3级,然后统计系数中0的个数(百分比表示),并进行重构, 最后计算重构图像的峰值信噪比(PSNR). 里面还附上了我写的实验报告,对大家理解Mallat算法和图像压缩很有帮助-Image two-dimensional discrete wavelet transform, transform series greater than or equal to 3, and then statistics of the number of c
JPEG2000_9_7_002.pdf
- 基于实数的二进制表示法,把CDF(Cohen,Daubechies and Feauveau)9/7双正交小波基的提升系数化为二进制,采用简单的移位一加操作代替结构复杂的浮点乘法器,从而实现了JPEG2000中9/7离散小波变换的定点计算.相对于浮点计算法,移位一加操作最大的优点是计算简单,特别易于超大规模集成电路实现,因而使硬件实时处理图像信号成为可能.实验仿真结果表明:在低压缩比的情况下,用移位一加操作重构的图像,其峰值信噪比(PSNR)只比浮点法低0.10 dB,当压缩比增大时,其PSNR
compress
- 使用小波分解进行图像压缩的几个例子, 有二次分解的有通过系数选取分解的 我刚做的 可用-Using wavelet decomposition for image compression of a few examples, has the second decomposition has selected through the coefficient of decomposition available to do I just
AStudyoWaveletImgaeCoding
- 通过测量小波变换产生图像的熵、方差、最大值、最小值、平均值及各子图像内小波变换系数间的相关性来确定各子图像应采取的编码策略-Wavelet transform generated by measuring the image entropy, variance, maximum, minimum, average and sub-image with the wavelet transform coefficients of correlation between each sub-image
ImageDenoisingusingwaveletThresholding
- 关于自适应小波图像除噪,根据每一层次的分解系数来确定阈值-about adaptive threshold wavelet denoising,Normalshrink
Separately_based_on_wavelet
- 基于小波变换的分开—合并图像分割matlab .采用多尺度小波变换系数作为四分树结构的分开一合并法图像分割的一致性度量 从而在大的图像块中。去除噪声的影响,在小的图像块中,以小波变换的局部极大值精确定位边缘,根据边缘信息进行分开一合并法图像分割 .实验表明.算法得到满意的结果 . -Separately based on wavelet transform- the combined image segmentation matlab. The use of multi-scale wa
test2_wavelet_decomposing
- 用两种方法做边缘检测并对比其效果:传统算子和小波分解去噪后得到的近似系数图像后提取边缘-Two ways to do edge detection and contrast the effect: the traditional operator and after denoising wavelet decomposition coefficients of the approximate image after the edge extraction
Adaptive_blind_watermark_algorithm
- 一种嵌入可读水印的自适应盲水印算法, 本文提出了一种基于DWT的嵌入可读水印的自适应盲水印算法,通过分析图像经离散小波变换后细 节子带系数的特性,把细节子带系数的均值和方差作为水印信息的一部分来自适应地修改图像小波分解后某些细节 子带的系数值,在满足水印不可感知性的条件下自适应地嵌入水印信息,实现了水印不可感知性和鲁棒性之间的折 衷. 同时,水印的提取无须求助于原图像,很好的实现了水印的盲检测. 这里的水印是一幅有实际意义的二值图像. 实 验结果和攻击测试表明,本文提出的算
Matlab_wavelet
- 掌握小波分析在图像分析等各方面的应用。对图像进行二维离散小波分解、多尺度二维离散小波分解 并提取二维小波分解的高频系数和低频系数, 画出原始图形并显示分解结果。-Master the application of wavelet analysis in image analysis and other applications. Image two-dimensional discrete wavelet decomposition, multi-scale two-dimensiona
yuzhi
- 小波软阈值simulink模型,对带噪语音信号进行小波分解,得到高低频系数,然后对高低频系数进行阈值处理,然后就行重构得到去噪语音信号-the simulink model of yuzhi
hvsWaveletWatermark
- 关于对hvx人体视觉水印的编写。有小波水印的全过程:分解、嵌入、重构、提取。人体视觉的体现:三大重要系数的利用 -On the preparation of hvx human visual watermark. There wavelet watermark the entire process: decomposition, embedding, reconstruction, extraction. Human visual manifestation: the use of thr
jiandanronghe
- 小波变换方法采用对高频系数平均的方法实现图像融合算法-Wavelet transform coefficients using the average of the high-frequency method to achieve image fusion algorithm
Ban-denoising
- 本代码是基于Bandelet的硬阈值SAR图像去噪,结果与小波变换进行对比,结果表示其在峰值信噪比,边缘保持系数上均有一定的提高。压缩包中有程序和SAR图像。-This code is based on Bandelet SAR image denoising with a hard threshold .the results were compared with the wavelet transform, and the results indicated that in the peak
MatermarkingDWT_DCT
- 提出一种基于DWT和DCT域的有意义二值图像数字水印算法 利用Arnold变换对水印序列进行置乱,消除 象素的空间相关性,增加水印的安全性 而结合小波变换和离散余弦变换的特性,将水印信息嵌入到图像变换域的低频和 中频系数中,提高水印的鲁棒性和不可见性 实验证明该算法具有较好的抗压缩、抗噪音和抗剪切性。-Watermarking in DWT and DCT area
watermarking
- 对音频信号分帧加窗,对每帧进行三阶小波变换,取其逼近系数平均值(一般为零).在此嵌入二值图像 并有对潜入水印信号进行盲检,恢复其嵌入水印-Sub-frame of the audio signal increases the Hamming window for each frame impletment third-order wavelet transform, whichever is close to the average coefficient (usually zero). a
wavelet
- 采样小波包分解语音信号,分解为3层,并求出分解系数-Speech signal using wavelet packet decomposition,decomposing 6 level,and attain decomposition coefficient
ScaleWaveFig
- 由滤波器系数绘制尺度函数和小波函数图像, M : 标准化常数h : (尺度)滤波器系数 g : 小波滤波器系数 a : 尺度函数初始化 w : 小波函数初始化-filter coefficient for images of Scale function and Wavelet Function
xiaobotuxiangchuli
- 用小波变换对图像进行三级分解及求出各个子带系数-Using wavelet transform image decomposition and find three different sub-band coefficients