discrete wavelet transform based selection
Báo cáo sinh học: " Research Article Eigenvectors of the Discrete Fourier Transform Based on the Bilinear Transform" potx
Ngày tải lên :
21/06/2014, 16:20
... 191085, 7 pages
doi:10.1155/2010/191085
Research Article
Eigenvectors of the Discrete Fourier Transform Based on
the Bilinear Transform
Ahmet Serbes and Lutfiye Durak-Ata (EURASIP Member)
Department ... definition of the discrete fractional Fourier transform. In this work, we disclose eigenvectors of the DFT matrix inspired by
the ideas behind bilinear transform. The bilinear transform maps the ... discrete
fractional Fourier transform, ” IEEE Transactions on Signal
Processing, vol. 48, no. 5, pp. 1329–1337, 2000.
[7] S C. Pei, W L. Hsue, and J J. Ding, Discrete fractional
Fourier transform based on new...
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báo cáo hóa học:" Discrete fourier transform-based TOA estimation in UWB systems" potx
Ngày tải lên :
21/06/2014, 17:20
... for ultra wideband signals based on the phase difference
between the discrete Fourier transforms (DFT) of the transmitted and received signals. The first estimator is based
on the slope of the ... maximum likelihood
esti mator (MLE), the energy -based estimators, the auto-
correlation -based estimators, the threshold -based esti-
mators, and others are based on the time domain
[2-10]. The drawback ... RESEARCH Open Access
Discrete fourier transform- based TOA estimation
in UWB systems
Achraf Mallat
1*
, Jérôme Louveaux
1
, Luc Vandendorpe
1
,...
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Báo cáo hóa học: " Research Article Complex Wavelet Transform-Based Face Recognition" pptx
Ngày tải lên :
22/06/2014, 01:20
... memory require-
ment. Complex wavelet transforms provide a satisfactory
alternative to this problem.
3. COMPLEX WAVELET TRANSFORM
3.1. Dual-tree complex wavelet transform
One of the most promising ... study complex wavelets
for the face recognition problem. Specifically, we employ the
recently developed dual-tree complex wavelet transform and
a new single-tree complex wavelet transform with ... designed wavelets and the
recently developed dual-tree complex wavelets for the face
recognition problem. The resulting complex wavelet- based
feature vectors are as discriminating as the Gabor wavelet
derived...
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The Discrete Fourier Transform
Ngày tải lên :
13/09/2012, 09:49
... term: transform, is extensively used in Digital Signal
Processing, such as: Fourier transform, Laplace transform, Z transform,
Hilbert transform, Discrete Cosine transform, etc. Just what is a transform?
To ... decomposed.
Chapter 8- The Discrete Fourier Transform 145
Type of Transform Example Signal
Fourier Transform
Fourier Series
Discrete Time Fourier Transform
Discrete Fourier Transform
signals that ... ]
141
CHAPTER
8
The Discrete Fourier Transform
Fourier analysis is a family of mathematical techniques, all based on decomposing signals into
sinusoids. The discrete Fourier transform (DFT) is...
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Tài liệu Multimedia Applications Of The Wavelet Transform ppt
Ngày tải lên :
25/12/2013, 05:17
... 67
5.3 NoiseReductionwithWavelets 68
5.3.1 WaveletTransformofaNoisyAudioSignal 68
5.3.2 Orthogonal Wavelet Transform and Thresholding . . 69
5.3.3 Nonorthogonal Wavelet Transform and Thresholding ... SamplingGridoftheWaveletTransform 17
1.6 Multiscale Analysis 18
1.6.1 Approximation 20
1.6.2 Detail 22
1.6.3 SummaryandInterpretation 24
1.6.4 FastWaveletTransform 26
1.7 Transformation Based on the Haar Wavelet ... wavelets, compactly supported, periodic or inter-
polating wavelets, separable and nonseparable wavelets for multiple dimensions, multiwavelets, and
wavelet packets. [Wic98] [Ste00]
1.3 The Wavelet...
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Tài liệu Multimedia Applications of the Wavelet Transform pdf
Ngày tải lên :
19/01/2014, 19:20
... lost and the wavelet
transform is reversible. This leads to the fast wavelet transform.
1.4 Time–Frequency Resolution
In the previous sections we have mentioned that the wavelet transform decomposes ... the wavelet theory: We discuss the time–frequency resolution
of the wavelet transform and compare it to the common short–time Fourier transform. The multiscale
property of the dyadic wavelet transform ... Chapter 5 presents
the theory of wavelet based audio denoising. Furthermore, we present our implementation of a
wavelet based audio denoising tool. Extending the wavelet transform into the second dimension,
we...
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DISCRETE WAVELET TRANSFORMS - A COMPENDIUM OF NEW APPROACHES AND RECENT APPLICATIONS pdf
Ngày tải lên :
23/03/2014, 03:20
... Dimensional Discrete Wavelet Transform
for Image Signals 3
Masahiro Iwahashi and Hitoshi Kiya
Chapter 2 A Pyramid -Based Watermarking Technique for Digital Images
Copyright Protection Using Discrete Wavelet ... Optical
Communication Systems Using Discrete Wavelet
Transformation 207
Nader Namazi, Ray Burris, G. Charmaine Gilbreath, Michele Suite
and Kenneth Grant
ContentsVI
Discrete Wavelet Transforms - A Compendium ... orders@intechopen.com
Discrete Wavelet Transforms - A Compendium of New Approaches and Recent Applications, Edited by
Awad Kh. Al - Asmari
p. cm.
ISBN 978-953-51-0940-2
DISCRETE WAVELET
TRANSFORMS - A
COMPENDIUM...
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mathematics of the discrete fourier transform
Ngày tải lên :
31/03/2014, 15:21
... Destructive Interference . . . . . 74
5.2 Exponentials . . 76
DRAFT of “Mathematics of the Discrete Fourier Transform (DFT),” by J.O.
Smith, CCRMA, Stanford, Winter 2002. The latest draft and linked ... again. Fortunately for us, all audio signals can be defined so
DRAFT of “Mathematics of the Discrete Fourier Transform (DFT),” by J.O.
Smith, CCRMA, Stanford, Winter 2002. The latest draft and linked ... even
(−1)
n/2
n!
θ
n
sin(θ)=
∞
n≥0
n odd
(−1)
(n−1)/2
n!
θ
n
DRAFT of “Mathematics of the Discrete Fourier Transform (DFT),” by J.O.
Smith, CCRMA, Stanford, Winter 2002. The latest draft and linked...
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induction to wavelet transform and image compression
Ngày tải lên :
08/05/2014, 18:42
... ties to MRA:
Subband coding
Haar transform
•
MRA is just a concept, and the wavelet- based
transformation is one method to implement it.
DISP@MD5
31
6
Wavelet Coding(2)
•
We only truncate ... goal of the transformation is to pack as much information
as possible into the smallest number of transform coefficients.
•
Compression is achieved during the quantization of the
transformed ... Avoiding the blocking artifact!
DISP@MD5
31
42
Wavelet coding is not only the transforming coding
exploiting the wavelet transform No subdivision!
Introduction(3)-MRA
•
It represents and analyzes...
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The discrete fourier transform
Ngày tải lên :
08/06/2014, 20:19
... ’FFT -based interpolation of x[n]’
hold on
stem(n*M, x, ’filled’), stem_fix
hold off
% savefig ’fig_interp’
0 1 2 3 4 5 6 7 8
0
0.5
1
1.5
2
n
x[n]
0 5 10 15 20 25 30
0
0.5
1
1.5
2
n
y[n]
FFT based ... ≤
E
x
E
y
.
Summary
We have now covered all the most important transforms:
continuous time: Laplace, Fourier, Fourier Series,
discrete time: Z, DTFT, DTFS, DFT/FFT
The first six are for pencil ... X
2π
N
k
= Nc
k
and
x
ps
[n] = x[n mod N], ∀n.
FT family tree diagram
DFT -based “real-time” filtering
skip
Application: DFT -based removal of low-frequency “hum.”
Analog approach: ˜x
a
(t) → H
a
(F...
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Báo cáo sinh học: " Research Article Automatic Modulation Recognition Using Wavelet Transform and Neural Networks in Wireless Systems" ppt
Ngày tải lên :
21/06/2014, 16:20
... (τ)
Continuous Haar wavelet transform of QAM64 signal
(a)
0 500 1000 1500 2000 2500
0
1
2
3
|CWT|
n (τ)
Continuous Haar wavelet transform of normalised QAM64 signal
(b)
Figure 1: Multi-step wavelet transform ... 2500
0.5
1.5
2.5
1
2
|CWT|
n (τ)
Continuous Haar wavelet transform of normalised ASK16 signal
(b)
Figure 2: Multi-step wavelet transform of ASK16 signal and
constant wavelet transform of its normalized version.
and ... Haar wavelet transform of PSK16 signal
(a)
0 500 1000 1500 2000 2500
0.5
1.5
2.5
1
2
|CWT|
n (τ)
Continuous Haar wavelet transform of normalised PSK16 signal
(b)
Figure 3: Constant wavelet transform...
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Báo cáo sinh học: " Research Article Adaptive Wavelet Transform Method to Identify Cracks in Gears" pot
Ngày tải lên :
21/06/2014, 16:20
... adaptive wavelet filter by
optimising the parameter β for a daughter wavelet. Here it
is presented how to find the best wavelet filter (the daughter
wavelet of a Morlet wavelet) instead of optimal wavelet
reconstruction.
In ... to optimising the wavelet base, sparsity is
usually applied in order to evaluate the wavelet base. Since
the wavelet that corresponds to the smallest number of signal
wavelet transformation coefficients ... denoising, Morlet wavelet is
used, and similarity between the Morlet wavelet and impulse
is applied. If nonorthogonal wavelet transform is used,
this does not ensure that, after the transform, independent
and...
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báo cáo hóa học:" Research Article Rate Distortion Analysis and Bit Allocation Scheme for Wavelet Lifting-Based Multiview Image Coding" potx
Ngày tải lên :
21/06/2014, 20:20
... truncation of wavelet
coefficients in each subband.
3. Distortion Analysis of Wavelet Lifting -Based
Multiview Image Coding
In this section, we analyze the distortion of wavelet lifting-
based multiview ... structure called
disparity-compensated lifting to transform the light fields
across the views. Haar and 5/3 wavelets are used as the
wavelet kernels. The wavelet coefficients in each subband are
coded ... distortion and the model -based bit allocation scheme of wavelet lifting -based multiview image coding.
Redundancies among image views are removed by disparity-compensated wavelet lifting (DCWL)....
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Báo cáo hóa học: " Research Article A Generalized Approach to Linear Transform Approximations with Applications to the Discrete Cosine Transform" pptx
Ngày tải lên :
21/06/2014, 22:20
... for the discrete cosine transform, ” IEEE Transactions
on Communications, vol. 25, no. 9, pp. 1004–1009, 1977.
[2] H. S. Hou, “A fast recursive algorithm for computing the
discrete cosine transform, ” ... application to compute pruning discrete cosine
transform, ” IEEE Transactions on Signal Processing, vol. 48,
no. 2, pp. 561–563, 2000.
[20] A. N. Skodras, “Fast discrete cosine transform pruning,” IEEE
Transactions ... Processing
t
2
t
1
t
Complexity
Available computing resource
Adaptive transform
Fixed
transform
Impossible
interval for fixed
transform
Figure 1: Computational complexity for fixed and adaptive
transforms (e.g., video decoding algorithm...
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Báo cáo hóa học: " Research Article Development and Evaluation of High-Performance Decorrelation Algorithms for the Nonalternating 3D Wavelet Transform" pdf
Ngày tải lên :
22/06/2014, 19:20
... the 3D wavelet transform, Kutil and Uhl have
conducted a study of the software and hardware needs of the
3D wavelet transform [14]. They have centered their study on
the classic wavelet transform ... conclu-
sions are given in Section 7 .
2. 3D WAVELET TRANSFORM
Over the past few years, there have been numerous reports
on the use of wavelets in many fields. wavelet- based meth-
ods are well suited for ... efforts have been reported
lately for the wavelet transform. Thulasiraman et al. have de-
veloped a multithreaded algorithm for computing the 2D
wavelet transform [13]. The authors conduct a set...
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