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Description: This is a toolbox for 2D DFT
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Size: 1703 |
Author: wiscforum@gmail.com |
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Description: 基2FFT，包括一个DFT-2-d FFT, including a DFT program
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Size: 28672 |
Author: xqz |
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Description: 利用傅里叶变换，在频域上对两幅图像配准，是一种比较配准的新方法，但是对弹性配准的效果不是很好 需要进一步的研究。-Registers two images (2-D rigid translation) within a fraction of a pixel specified by the user. Instead of computing a zero-padded FFT (fast Fourier transform), this code uses selective upsampling by a matrix-multiply DFT (discrete FT) to dramatically reduce computation time and memory without sacrificing accuracy
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Size: 5120 |
Author: wangwei |
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Description: 多维傅里叶变换，二维DFT快速算法，共分五部--三：二维实序2D-DFT列行列算法-Multi-dimensional Fourier transform, fast algorithm for two-dimensional DFT is divided into 5- 3: two-dimensional real column ordinal ranks of 2D-DFT algorithm for
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Size: 3072 |
Author: jet ju |
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Description: Presently FFT usage in GPS receivers has been a
topic of extensive study and many improved FFT-based
acquisition methods with averaging correlation
technique also have emerged. Although averaging
arithmetic can reduce the instant processing points of
FFT/IFFT, their noise performance is not promising. In
this paper a novel compress-sampling algorithm for
FFT-base GPS signal acquisition method is proposed.
It not only diminishes the size of FFT/IFFT core but
also enhances the noise immunity of receiver with its
“redundancy” structure. Simulation results of Matlab
testify that the computational complexity of the novel
algorithm has been efficiently suppressed to only
0.93 over the 2D search method in time domain. At
the same time the lower amplitude threshold obtained
from the novel method gets a lower false alarm
probability comparing with the direct DFT algorithm
with no compression. The noise immunity is enhanced-Presently FFT usage in GPS receivers has been a
topic of extensive study and many improved FFT-based
acquisition methods with averaging correlation
technique also have emerged. Although averaging
arithmetic can reduce the instant processing points of
FFT/IFFT, their noise performance is not promising. In
this paper a novel compress-sampling algorithm for
FFT-base GPS signal acquisition method is proposed.
It not only diminishes the size of FFT/IFFT core but
also enhances the noise immunity of receiver with its
“redundancy” structure. Simulation results of Matlab
testify that the computational complexity of the novel
algorithm has been efficiently suppressed to only
0.93 over the 2D search method in time domain. At
the same time the lower amplitude threshold obtained
from the novel method gets a lower false alarm
probability comparing with the direct DFT algorithm
with no compression. The noise immunity is enhanced
Platform: |
Size: 254976 |
Author: zohreh |
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Description: Presently FFT usage in GPS receivers has been a
topic of extensive study and many improved FFT-based
acquisition methods with averaging correlation
technique also have emerged. Although averaging
arithmetic can reduce the instant processing points of
FFT/IFFT, their noise performance is not promising. In
this paper a novel compress-sampling algorithm for
FFT-base GPS signal acquisition method is proposed.
It not only diminishes the size of FFT/IFFT core but
also enhances the noise immunity of receiver with its
“redundancy” structure. Simulation results of Matlab
testify that the computational complexity of the novel
algorithm has been efficiently suppressed to only
0.93 over the 2D search method in time domain. At
the same time the lower amplitude threshold obtained
from the novel method gets a lower false alarm
probability comparing with the direct DFT algorithm
with no compression. The noise immunity is enhanced-Presently FFT usage in GPS receivers has been a
topic of extensive study and many improved FFT-based
acquisition methods with averaging correlation
technique also have emerged. Although averaging
arithmetic can reduce the instant processing points of
FFT/IFFT, their noise performance is not promising. In
this paper a novel compress-sampling algorithm for
FFT-base GPS signal acquisition method is proposed.
It not only diminishes the size of FFT/IFFT core but
also enhances the noise immunity of receiver with its
“redundancy” structure. Simulation results of Matlab
testify that the computational complexity of the novel
algorithm has been efficiently suppressed to only
0.93 over the 2D search method in time domain. At
the same time the lower amplitude threshold obtained
from the novel method gets a lower false alarm
probability comparing with the direct DFT algorithm
with no compression. The noise immunity is enhanced
Platform: |
Size: 87040 |
Author: zohreh |
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Description: mathlab for image processing 2D, DFT, FFT etc.
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Size: 25600 |
Author: Canggih Adiyasa |
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Description: 利用傅立叶反变换自动生成随机分形面，可生成各向同性或各向异性的。-Generating the 2D fractal surfaces using inverse DFT method
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Size: 1024 |
Author: 毕丽思 |
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Description: 关于DFT的文章，应用FPGA实现傅立叶变换。-Abstract—We present a domain-specific approach to generate
high-performance hardware-software partitioned implementations
of the discrete Fourier transform (DFT). The partitioning
strategy is a heuristic based on the DFT’s divide-and-conquer
algorithmic structure and fine tuned by the feedback-driven
exploration of candidate designs. We have integrated this approach
in the Spiral linear-transform code-generation framework
to support push-button automatic implementation. We present
evaluations of hardware-software DFT implementations running
on the embedded PowerPC processor and the reconfigurable
fabric of the Xilinx Virtex-II Pro FPGA.
In our experiments, the 1D and 2D DFT’s FPGA-accelerated
libraries exhibit between 2 and 7.5 times higher performance
(operations per second) and up to 2.5 times better energy
efficiency (operations per Joule) than the software-only version.
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Size: 235520 |
Author: 李然 |
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Description: matlab code that make an image with capability of rotataing, shifting, .. and compute 2-d DFT.
Platform: |
Size: 1024 |
Author: ali |
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Description: code in visual c++ environment for dft in 2d,
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Size: 1024 |
Author: amann |
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Description: 1 Haar Wavelets
1.1 The Haar transform
1.2 Conservation and compaction of energy
1.3 Haar wavelets
1.4 Multiresolution analysis
1.5 Compression of audio signals
1.6 Removing noise from audio signals
1.7 Notes and references
2 Daub echies wavelets
2.1 The Daub4 wavelets
2.2 Conservation and compaction of energy
2.3 Other Daubechies wavelets
2.4 Compression of audio signals
2.5 Quantization, entropy, and compression
2.6 Denoising audio signals
2.7 Two-dimensional wavelet transforms
2.8 Compression of images
2.9 Fingerprint compression
2.10 Denoising images
2.11 Some topics in image processing
2.12 Notes and references
3 Frequency analysis
3.1 Discrete Fourier analysis
3.2 Definition of the DFT and its properties
3.3 Frequency description of wavelet analysis
3.4 Correlation and feature detection
3.5 Object detection in 2D images
3.6 Creating scaling signals and wavelets
3.7 Notes and references
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Size: 4108288 |
Author: Rakesh |
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Description: example of use DFT 2D in a gray image by matlab
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Size: 10240 |
Author: freezer |
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Description: mpi编程方法，分布式编程，16个CPU进行二维DFT运算，对图像进行处理-We are going to use 16 CPUs in the jinx cluster to performe the 2d DFT using distributed computing
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Size: 1715200 |
Author: 徐青木 |
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Description: 二维的离散傅立叶变换，写的比较简单，没有给出demo(Two-dimensional discrete Fourier transform, writing is relatively simple, did not give demo)
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Size: 4096 |
Author: tony2014 |
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Description: 利用霍夫曼编码进行图像压缩处理，此程序为霍夫曼编码的示例(The performance of a Huffman code is a function of the entropy of the signal distribution and therefore can be
highly dependent in the transform domain in which the code is applied. For example, JPEG partitions an image
into blocks of 8x8 pixels and then transforms these with a 2D Discrete Cosine Transform (DCT), similar to a
DFT.)
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Size: 3072 |
Author: Jessicapu |
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Description: 实现了二维离散傅里叶变换和haar小波变换，附了一些冈萨雷斯教材的图片，做了一个GUI，一些参数可调。对图像处理的初学者应该有所帮助。(The two-dimensional discrete Fourier transform and Haar wavelet transform are realized, and some pictures of Gonzales textbook are attached, and a GUI is made, and some parameters are adjustable. It should be helpful for the beginner of image processing.)
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Size: 1989632 |
Author: 风小麟 |
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