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Description: 基于MATLAB实现了极坐标下的傅里叶变换，对一个给定 n×n 的二维信号，其计算复杂度等价于笛卡尔坐标下的2D-FFT，可广泛应用于图像处理和分析。-A fast high accuracy Polar FFT algorithm is given in the software package written in MATLAB. For a given 2D signal of size n×n, the algorihtm s complexity is just like in a Cartesian 2D-FFT, which can be used widely in image processing and analysis.
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Size: 579584 |
Author: 周清保 |
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Description: 代码给出了基于混合门限带迭代步长的稀疏图像重构。特别地，压缩采样矩阵为抽样傅里叶变换矩阵，利用2D-FFT,大大降低了计算复杂度。-The mixedthreshold sparse image reconstruction with step is given in the package. In particular， the 2D-FFT is used to disign the sample matrix, which can reduce the computational compexity dramatically.
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Size: 28672 |
Author: 周清保 |
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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: 快速 二维傅立叶变换 和 反变换 实例-Fast two-dimensional Fourier transform and inverse transform instance
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Size: 9216 |
Author: zhoujunming |
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Description: 超宽带雷达信号二维FFT求速度和距离，速度补偿后的算法-Ultra-wideband radar signal 2D FFT for speed and distance, speed compensated algorithm
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Size: 1024 |
Author: lucky |
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Description: 二维fft变换，通过一维fft变换转换成二维fft变换。-2D fft transform, convert two-dimensional one-dimensional fft transform fft transform.
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Size: 414720 |
Author: 张娜 |
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Description: the code in this file can perform fft_2dilemention.it can be used to compress a image.
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Size: 8539136 |
Author: xzj |
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Description: 二维fft算法，运算效率高，输入输出为图像，方便修改和显示。-2d fft algorithm for bmp picture。
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Size: 3072 |
Author: ironhand |
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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: 改进的2d fft算法，做了大量优化，效果也很好，具有很大的使用价值-Improved 2d fft algorithm, a lot of optimization, the effect is also very good, with a great value
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Size: 16132096 |
Author: XXXXXX123 |
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Description: opencl实现二维傅里叶变换,GPU并行计算实现FFT-opencl 2D FFT
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Size: 78848 |
Author: 王珂 |
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Description: Image Compression
A collection of simple routines for image compression using different techniques.
BTCODE:
Image compression Using Block Truncation Coding.
PYRAMID:
Image compression based on Gaussian Pyramids.
DCTCOMPR:
Image compression based on Discrete Cosine Transform.
IMCOMPR:
Image compression based on Singular Value Decomposition.
The given codes can be also used in 2D noise suppression.
Notes:
The function conv2fft performs a 2D FFT-based convolution.
Type help conv2fft on MATLAB command window for more informations.-Image Compression
A collection of simple routines for image compression using different techniques.
BTCODE:
Image compression Using Block Truncation Coding.
PYRAMID:
Image compression based on Gaussian Pyramids.
DCTCOMPR:
Image compression based on Discrete Cosine Transform.
IMCOMPR:
Image compression based on Singular Value Decomposition.
The given codes can be also used in 2D noise suppression.
Notes:
The function conv2fft performs a 2D FFT-based convolution.
Type help conv2fft on MATLAB command window for more informations.
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Size: 9216 |
Author: keyvan |
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Description: 面阵的幅度相位全控制自适应数字波束形成算法——对角加载 QRD-SMI 算法的研究；两种面阵唯相位(Phase-Only)数字波束形成算法——小相
位扰动约束算法和期望方向增益最大约束算法的研究；面阵的数字多波束形成算法——二维 FFT 多波束的研究，以及 FFT 在可编程逻辑器件中的实现。
-Research of the adaptive digital beamforming algorithm, which
control both amplitude and phase of each array element: diagonal
loading QRD-SMI algorithm.
② Research of two Phase-Only DBF algorithms: small phase
perturbation restriction algorithm and maximum gain of the
expected direction restriction algorithm.
③ Research of multiple beams algorithm for planar array: 2D-FFT
multiple beams. And the realization of FFT with CPLD.
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Size: 3404800 |
Author: 313039 |
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Description: 2d fft 和 1d fft，一维和二维离散基2fft-2d fft ， 1d fft
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Size: 241664 |
Author: 刘振 |
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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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