Description: 关于二维小波变换的程序 [精华]
说明：此算法重在概念，速度并不是很快。因为FOR循环的缘故。此程序从循环矩阵的观点出发，把圆周卷积和快速幅里叶变换建立了联系。实现了分解和无失真重构。它只做了一层分解，即将256x256图形分解成为64x64的四个图形，避免了使用WKEEP()的困惑。主要思想为用小波滤波器族构造正交阵W,变换写为B=W*A*W ,反变换为：A=W *A*W,这与所有正交变换无异。W为循环正交矩阵，因此可用FFT实现快速运算，难点就在重构矩阵上。若用矩阵概念明确，一个共扼转置可以搞顶。但FFT的使用必须找到与分解序列的关系。-on Wavelet Transform procedures [best] Note : This algorithm important concept is not speed quickly. Because FOR cycle nowadays. This program cycle from the point of view of Matrix, circular convolution and fast Fourier transform is established links. To achieve the decomposition and reconstruction without distortion. It only had one decomposition, 256x256 graphics will be 64x64 decomposition of the four graphics, avoiding the use of WKEEP () confusion. The main idea of using wavelet filter generator orthogonal array W, write to transform B = W * A * W, anti-Transform : A = W * A * W, which is orthogonal transformation all the same. W cycle orthogonal matrix, can be used to achieve rapid FFT computation, on the difficult reconstruction matrix. If a clear matrix concept, a home to a total o Platform: |
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Author:罗松溪 |
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Description: 文章通过对实序列快速傅里叶变换的算法推导及Mallat 算法原理的分析，根据离散小波变换（DWT）算
法结构特征，提出了一种离散小波的快速变换算法，给出了相应的算法步骤。从数学理论上进行了论证，并把该算法
应用到静态图像处理中，得到了很好的快速和重建效果，具有一定的实用价值。
关键词：小波分析；Mallat 算法；快速小波算法 图像处理
中图分类号：TN914 文献标识码：A
1 引言
小波分析是近十多年来迅速发展起来的新兴学科和信号分析理论，是继傅里叶分析方法之后的重
大突变。它具有时域局部化和频域局部化的优点，而且高频端的时间间隔小（有着高的时间分辨率），
低频端的时间间隔大（有着高的频率分辨率），这与人的视觉机制由粗到细的认识过程相一致，固而有
“数学显微镜”之称，是进行信号处理和分析的有效工具。特别是其多分辨率分析理论及其快速算法
——Mallat 算法在数字信号处理和数字通信-articles on real sequence Fast Fourier Transform algorithm Derivation Principle and Mallat algorithm analysis, discrete wavelet transform (DWT) algorithm structure, a fast discrete wavelet transform algorithm, corresponding to the given algorithm steps. From a theoretical mathematical proof, and the algorithm is applied to the static image processing, to be a good and rapid reconstruction effect, it is of great practical value. Keywords : wavelet analysis; Mallat algorithm; Fast Wavelet Image Processing Algorithms Key words : ODFD code : A preamble to a wavelet analysis of the last 10 years developed rapidly emerging disciplines and signal analysis theory, Fourier analysis is the method after a major mutation. It is localized in time domain and frequency domain of local advantages, but hig Platform: |
Size: 9996 |
Author:顶替 |
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Description: 基于链码提取的傅立叶描述子,以及傅立叶反变换对图象边界进行重建
-chain code extraction based on Fourier descriptors, and the Fourier transform of image reconstruction border Platform: |
Size: 1024 |
Author:ff |
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Description: 实验内容：
1．求下列3个模板的频率响应，并显示其三维图形；选择一幅图
像，利用这3个模板分别对该图像进行卷积运算，将卷积运算
获得的图像与原始图像进行比较，说明各模板的类型以及模板
（b）、（c）的区别与联系。
2. 选择一幅图像，对其进行离散Fourier变换，仅利用其相位谱重构原图像，然后仅利用其振幅谱重构原图像，比较实验结果；
选择两幅不同类型的图像，分别进行Fourier变换，交换二者的相位谱后求Fourier反变换，比较实验结果，说明图像Fourier相位谱的重要性。-Experimental contents: 1. Template for the following three frequency response and to show its three-dimensional graphics select an image using the three templates, respectively, of the image convolution operation, the convolution operation to obtain the images were compared with the original image to illustrate the template the type of template (b), (c) the difference with the contact. 2. Select an image, its discrete Fourier transform, only to use its phase spectrum remodeling the original image, and then only the use of its amplitude spectrum reconstruction of the original image to compare experimental results choice of two different types of images, respectively Fourier Transform, the exchange between the two after the phase spectrum for Fourier Transform, compare experimental results to illustrate the image of the importance of Fourier phase spectrum. Platform: |
Size: 1024 |
Author:syq |
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Description: 关于傅立叶描述子的GUI界面，本程序可计算目标的一种形状描述符——轮廓傅立叶描述子。并可通过傅立叶描述符重构目标轮廓。-On the Fourier descriptors of the GUI interface, this program objectives computable descriptor of a shape- the outline of Fourier descriptors. Via Fourier reconstruction of the target outline descriptor. Platform: |
Size: 26624 |
Author:xiaoqinkun |
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Description: MATLAB医学影像处理实验(内含14个原代码及教学的说明)
(1)Plot a sine function using MATLAB, and write the data into a file
(2)Read data from a file, plot a SINC function, and append the result back to the same file
(3)Plot a Gaussian distribution using MATLAB
(4)Fourier transform of a square function is a SINC function
(5)1-D low-pass filters and their point-spread functions
(6)2-D low-pass filters and their point-spread functions
(7)Fourier Transform of circles and an ellipse
(8)Image rotation and magnification
(9)MR k-space data reconstruction and low-pass filter
(10)Display an image in gray level
(11)Display an image in color
(12)Region of interest selection and display
(13)Cross correlation between temperature and humidity
(14)Independent component analysis of mixed music files -MATLAB Medical Image Process Experiments (including 14 source code and course documents)
(1)Plot a sine function using MATLAB, and write the data into a file
(2)Read data from a file, plot a SINC function, and append the result back to the same file
(3)Plot a Gaussian distribution using MATLAB
(4)Fourier transform of a square function is a SINC function
(5)1-D low-pass filters and their point-spread functions
(6)2-D low-pass filters and their point-spread functions
(7)Fourier Transform of circles and an ellipse
(8)Image rotation and magnification
(9)MR k-space data reconstruction and low-pass filter
(10)Display an image in gray level
(11)Display an image in color
(12)Region of interest selection and display
(13)Cross correlation between temperature and humidity
(14)Independent component analysis of mixed music files Platform: |
Size: 2280448 |
Author:江儜昶 |
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Description: 用matlab语言实现傅里叶切片定理，以及基于反投影及滤波反投影的CT图像重建的程序设计试验-Matlab language with Fourier slice theorem, and on the back projection and filtered back projection image reconstruction program design CT test Platform: |
Size: 200704 |
Author:戚曼 |
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Description: 使用每秒10个采样的频率 ，对信号 进行采样，画出原始信号的傅立叶变换X(f) 和理想采样信号的傅立叶变换 。假定重构滤波器是带宽为 的理想低通滤波器，具有带通增益 ，画出重构滤波器的输出-Using 10 samples per second frequency, the signal is sampled, to draw the original signal Fourier transform X (f) and the ideal sampling signal Fourier transform. Reconstruction filter is assumed that the ideal bandwidth low-pass filter with a bandpass gain, draw the output of reconstruction filter Platform: |
Size: 8192 |
Author:sophy |
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Description: 该源码包包括二值图像边界提取程序、边界序列提取程序、边界序列均匀抽样程序、计算边界的傅立叶描绘子程序、根据傅立叶描绘子对图像边界重建程序-The source package includes binary image edge detection process, the boundary sequence extraction process, the border sequence of uniform sampling procedure to calculate the boundary Fourier subroutine described, according to the boundary Fourier descriptors of the image reconstruction process Platform: |
Size: 54272 |
Author:yechao |
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Description: MRI部分傅里叶变换重建，采用POCS技术通过傅里叶变换对MRI进行重建-MRI of the Fourier transform reconstruction, the POCS technology through the Fourier transform on the MRI reconstruction Platform: |
Size: 11264 |
Author:婉灵兰 |
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Description: 利用傅里叶矩阵构造压缩感知测量矩阵恢复重建概率(Using the Fourier matrix to construct a measurement matrix to recover the reconstruction probability) Platform: |
Size: 2048 |
Author:徐徐的非 |
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