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Description: 图象FFT——1D变换，快速变换针对2D图象-FFT image -- Transform 1D, 2D against rapidly changing images
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Size: 941 |
Author: 刘曦 |
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Description: 基2基4的2d、3d的fft快速算法，代码写的很规范，效率很高。
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Size: 61413 |
Author: 张强 |
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Description: 利用蝶形算法类似于FFT，利用先行再列实现二维DCT。速度很快。包含反DCT的代码。-similar to the use of butterfly FFT algorithm, the first re-use of 2D DCT out. Very fast. Contain anti - DCT code.
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Size: 2264 |
Author: yaoli |
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Description: 图象FFT——1D变换，快速变换针对2D图象-FFT image-- Transform 1D, 2D against rapidly changing images
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Size: 1024 |
Author: 刘曦 |
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Description:
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Size: 3072 |
Author: 彭怀敏 |
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Description: 图像的傅立叶及反变换演示程序，包括了打开图像，现实幅度谱等功能-code for 2D image FFT and IFFT transforms.
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Size: 88064 |
Author: Simon |
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Description: Matlab动力系统和时间序列分析工具箱:这个工具箱用来分析动力系统和时间序列，它可以定制为：常微分方程、随机微分方程。所有分析的方法被封装在工具箱中，你可以通过命令行或GUI来调用。包含的功能：
ODE常微分方程, SDE随机微分方程和map integration 分析时间序列，过滤、归一化/均衡化、直方图、2D直方图、ACF, MAI, FFT,最大lyapunov指数计算、模式识别。
动力系统分析：创建Poincare截面、分岔图、计算lyapunov指数。-The kit used to analyze the power systems and time series, it can be customized as: ordinary differential equations, stochastic differential equations. All analysis methods are encapsulated in the toolbox, you can call the command line or GUI. Includes features: ODE ordinary differential equation, SDE Stochastic Differential Equations and map integration analysis of time series, filtering, normalization/equalization, histogram, 2D histogram, ACF, MAI, FFT, the maximum lyapunov index, pattern recognition . Power System Analysis: Creating Poincare section, bifurcation diagrams, calculations lyapunov index.
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Size: 381952 |
Author: 朱凤宇 |
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Description: 2010年ICIP最新文章关于图像复原，提出了2D NHA算法，实验证明了该算法的优越性能。-In this study, we develop a technique for image restoration
The proposed method is based on the 2D non-harmonic analy-
sis (2D NHA). The 2D NHA algorithm assigns an initial value
by using the spectrum of the maximum amplitude, which is
obtained by FFT. This value is converged to a global min-
imum by using the steepest descent method and Newton’s
method. And, an image recovery method was proposed by
improving the cost function of 2D NHA as excluding the
missing region. To verify the effi cacy of the proposed method
simulation is carried out using a damaged image. The simula-
tion results show that a high-quality image is obtained when
the missing region is consist of periodicity. In both the ob-
jective and the subjective comparisons, the qualities of the
images recovered using the proposed method are the most fa-
vorable in all cases.
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Size: 140288 |
Author: kongsuhong |
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Description: 构造一幅黑白二值图像，在128×128的黑色背景中心产生一个4×4的白色方块，利用1DFFT子程序实现2D傅里叶变换.-Construction of a black and white two value image, in a 128 x128black background center generates a 4x 4white box, use 1DFFT to achieve2D subroutine fft
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Size: 1024 |
Author: 韦蕴珊 |
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Description: 這一個“慢”，但簡單和兩維FFT的演示可以從這裡下載（包括源）。
演示生成的一維或二維的輸入信號（256或256×256大小），這是顯示在左邊的位圖（8位灰度調色板）。
信號包含一個中心的矩形脈衝（脈衝大小從2到256）。因為輸入的是真實的，FFT的日常工聯會（）產生偏見的頻譜。如果“重排”被選中，零頻率頻譜的中心轉移到從各自的象限交換數據。複雜的結果顯示在正確的位圖，在可能的方式有四種：模塊，相位，實部或虛部。如果“InvFFT”被選中，逆FFT頻譜，結果是恢復輸入信號應用。然而，恢復輸入信號正確的“重新排序”，已是自由。為了保持傳統的2D信號可以餵從演示Lenna.bmp文件。 （Lenna見下面）。-This "slow" but simple One- and Two-dimensional FFT Demo can be downloaded from here (source included).
The Demo generates a 1D or 2D input signal (with size 256 or 256x256) which is displayed in the left bitmap (8 bit gray palette).
The signal contains a centered rectangular pulse (pulse size from 2 to 256). Since the input is real, the FFT routine ftu() produces biased spectrum. If "Reorder" is checked, the zero frequency is shifted to the center of the spectrum by swapping data from the respective quadrants. The complex result is displayed in the right bitmap in one of four possible modes: Module, Phase, Real part or Imaginary part. If "InvFFT" is checked, an inverse FFT is applied on the spectrum, the result being the recovered input signal. However, to recover the input signal correctly "Reorder" has to be unchecked. In order to keep up with tradition, the 2D signal may be fed from Lenna.bmp file which comes with the Demo. (See about Lenna below).
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Size: 302080 |
Author: 蕭柏堂 |
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Description: MONOFILT - Apply monogenic filters to an image to obtain 2D analytic signal
Implementation of Felsberg s monogenic filters
Usage: [f, h1f, h2f, A, theta, psi] = ...
monofilt(im, nscale, minWaveLength, mult, sigmaOnf, orientWrap)
3 4 2 0.65 1/0
Arguments:
The convolutions are done via the FFT. Many of the parameters relate
to the specification of the filters in the frequency plane.- MONOFILT - Apply monogenic filters to an image to obtain 2D analytic signal
Implementation of Felsberg s monogenic filters
Usage: [f, h1f, h2f, A, theta, psi] = ...
monofilt(im, nscale, minWaveLength, mult, sigmaOnf, orientWrap)
3 4 2 0.65 1/0
Arguments:
The convolutions are done via the FFT. Many of the parameters relate
to the specification of the filters in the frequency plane.
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Size: 3072 |
Author: seshu babu v |
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Description: 2D-基2 时间抽取 fft变换,visual c++ 控制台程序，实现2维矩阵的fft变换-fft transform
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Size: 234496 |
Author: 黄伟庚 |
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Description: 对数字图像进行傅里叶变换，查看其频谱图及相位图。(Fourier transform of digital images, to see its spectrum and phase diagram.)
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Size: 27648 |
Author: 闪电侠333
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Description: 本文档介绍了快速傅里叶变换的技术，并给出了C++语言中用于计算图像数据的二维FFT的源代码。(This document introduces the techniques of fast Fourier transform and gives a source code in C for computing 2D FFT on image data.)
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Size: 30720 |
Author: bingcheng888
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Description: 用FEKO仿真，获得FFE文件，放到文件夹下，修改相应参数，即可成像
基本的2D IFFT成像算法(The FFE file is obtained by FEKO simulation. It is placed in the folder and the corresponding parameters are modified. Then the image can be imaged.
Basic 2D IFFT Imaging Algorithms)
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Size: 51200 |
Author: Alienfte |
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Description: MATLAB中的雷达目标生成和检测,调频连续波,FFT（用于范围检测的1D）,FFT (2D for distance and speed detection),2d恒定火焰警报率（2D-CFAR）(Radar target generation and detection in MATLAB, FM continuous wave, FFT (1D for range detection), FFT (2D for distance and speed detection), 2d constant flame alarm rate (2D-CFAR))
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Size: 648192 |
Author: 黛汐520 |
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