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Search - fftshift - List
[
Other
]
MatrixOper
DL : 0
矩阵运算处理,包括FFT,IFFT,FFTSHIFT等
Update
: 2008-10-13
Size
: 2.65kb
Publisher
:
yz
[
Special Effects
]
fftshift_and_triang
DL : 0
用C++实现了MATLAB中fftshift及triang函数功能,代码是实现此二功能的函数
Update
: 2008-10-13
Size
: 5.29kb
Publisher
:
李明
[
Other resource
]
change
DL : 0
matlab中应用小波变换的几个程序 包括cwt,dwt,fft,fftshift的使用 版本为matlab7.0
Update
: 2008-10-13
Size
: 2.32kb
Publisher
:
杨青禾
[
Graph program
]
chap04
DL : 0
ch4_1_4:对f进行补零(区域大小为256×256),而后进行二维快速傅立叶变换(§4.1.2) ch4_1_5:使变换结果的零频率分量位于中心,调用函数fftshift(§4.1.2) ch4_1_6:利用函数ifft2对乘积进行傅立叶反变换(§4.1.3) ch4_1_7:得到在图像text.png中对应字母“a”的定位结果(§4.1.3) ch4_2_1:对一幅图像进行离散余弦变换(§4.2.1) ch4_2_2:JPEG图像压缩(§4.2.2) ch4_3_1:正方形图像在0°和45°方向上的Radon变换(§4.3.1) ch4_3_2:计算方形图像从0°到180°每隔1°计算一次Radon变换的命令(§4.3.1) ch4_3_3:直线检测(§4.3.1) ch4_3_4:利用radon函数和iradon函数构造一个简单图像的投影并重建图像(§4.3.2) ch4_4_1:映射和重建图像(§4.4.1)
Update
: 2008-10-13
Size
: 4.11kb
Publisher
:
sherman1944
[
Algorithm
]
MatrixOper
DL : 0
矩阵运算处理,包括FFT,IFFT,FFTSHIFT等-Matrix processing, including FFT, IFFT, FFTSHIFT, etc.
Update
: 2025-02-17
Size
: 2kb
Publisher
:
yz
[
Special Effects
]
fftshift_and_triang
DL : 0
用C++实现了MATLAB中fftshift及triang函数功能,代码是实现此二功能的函数-With C++ Achieved in MATLAB function fftshift and triang function code is to achieve a function of these two functions
Update
: 2025-02-17
Size
: 5kb
Publisher
:
李明
[
Wavelet
]
change
DL : 0
matlab中应用小波变换的几个程序 包括cwt,dwt,fft,fftshift的使用 版本为matlab7.0-Application of wavelet transform matlab several procedures, including cwt, dwt, fft, fftshift use version matlab7.0
Update
: 2025-02-17
Size
: 2kb
Publisher
:
杨青禾
[
Graph program
]
chap04
DL : 0
ch4_1_4:对f进行补零(区域大小为256×256),而后进行二维快速傅立叶变换(§4.1.2) ch4_1_5:使变换结果的零频率分量位于中心,调用函数fftshift(§4.1.2) ch4_1_6:利用函数ifft2对乘积进行傅立叶反变换(§4.1.3) ch4_1_7:得到在图像text.png中对应字母“a”的定位结果(§4.1.3) ch4_2_1:对一幅图像进行离散余弦变换(§4.2.1) ch4_2_2:JPEG图像压缩(§4.2.2) ch4_3_1:正方形图像在0°和45°方向上的Radon变换(§4.3.1) ch4_3_2:计算方形图像从0°到180°每隔1°计算一次Radon变换的命令(§4.3.1) ch4_3_3:直线检测(§4.3.1) ch4_3_4:利用radon函数和iradon函数构造一个简单图像的投影并重建图像(§4.3.2) ch4_4_1:映射和重建图像(§4.4.1)
Update
: 2025-02-17
Size
: 4kb
Publisher
:
sherman1944
[
source in ebook
]
cgh
DL : 0
计算全息close all clc clear A=zeros(64) A(15:20,20:40)=1 A(15:50,20:25)=1 A(45:50,20:40)=1 A(30:34,20:35)=1 % ppp=exp(rand(64)*pi*2*i) A=A.*ppp % Author s email: zjliu2001@163.com figure imshow(abs(A),[]) Fa=fft2(fftshift(A)) Fs=fftshift(Fa) Am=abs(Fs) % amplitude Ph=angle(Fs) % phase s=11 % 这表示边长吗? cgh=zeros(64*s) th=max(max(abs(Fs))) -CGH close all clc clearA = zeros (64) A (15:20,20:40) = 1 A (15:50,20:25) = 1 A (45:50,20:40) = 1 A (30 : 34,20:35) = 1 ppp = exp (rand (64)* pi* 2* i) A = A.* ppp Author s email: zjliu2001@163.comfigure imshow (abs (A), [] ) Fa = fft2 (fftshift (A)) Fs = fftshift (Fa) Am = abs (Fs) amplitudePh = angle (Fs) phases = 11 This means that the length was it? cgh = zeros (64* s) th = max (max (abs (Fs)))
Update
: 2025-02-17
Size
: 3kb
Publisher
:
ccfu
[
Algorithm
]
chap04
DL : 0
ch4_1_1:矩形连续函数的傅立叶变换(§4.1.1) ch4_1_2:构建一个矩形函数(§4.1.2) ch4_1_3:对f进行二维快速傅立叶变换(§4.1.2) ch4_1_4:对f进行补零(区域大小为256×256),而后进行二维快速傅立叶变换(§4.1.2) ch4_1_5:使变换结果的零频率分量位于中心,调用函数fftshift(§4.1.2) -ch4_1_1: rectangular continuous function of the Fourier transform (§ 4.1.1) ch4_1_2: to build a rectangular function (§ 4.1.2) ch4_1_3: of f for two-dimensional fast Fourier transform (§ 4.1.2) ch4_1_4: for f to zero (region size of 256 × 256), and then carry out two-dimensional fast Fourier transform (§ 4.1.2) ch4_1_5: Transform the results so that the zero-frequency component at the center, call the function fftshift (§ 4.1.2)
Update
: 2025-02-17
Size
: 4kb
Publisher
:
汤跃峰
[
matlab
]
chap04
DL : 0
matlab实例clearN=100f=zeros(50,50) f(15:35,23:28)=1 figure(1)imshow(f, notruesize )F=fft2(f,N,N) F2=fftshift(abs(F)) figure(2)x=1:N y=1:N mesh(x,y,F2(x,y)) colormap(gray) colorbar-matlab
Update
: 2025-02-17
Size
: 4kb
Publisher
:
孙强
[
matlab
]
DSB_FM_TRANSMIT
DL : 0
Transmit 2 signals via DSB-SC AM Fs= 44.1 KHz , fft fftshift
Update
: 2025-02-17
Size
: 15.86mb
Publisher
:
manos
[
Delphi VCL
]
example4_6
DL : 0
:滤波 fs=400 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=5 时间窗大小 t=0:ts:T -hf1=zeros(1,N) hf1(f<=B1&f>=-B1)=1 y1=hf1.*fftshift(y) figure subplot(211) plot(f,abs(fftshift(y))/N,f,hf1, r-- ) axis([-fs/2,fs/2,0,1.2]) title( 原信号频谱 ) xlabel( f /Hz ) subplot(212) plot(f,abs(y1)/N) title( 低通滤波,截止频率90Hz ) xlabel( f /Hz )
Update
: 2025-02-17
Size
: 1kb
Publisher
:
张红
[
Delphi VCL
]
example4_3
DL : 0
例3:分析占空比为ta的矩形脉冲频谱 T=1 时间窗大小 ta=0.5 占空比 N=256 t=linspace(-T,T,N) ts=2*T/N fs=1/ts -x=zeros(1,N) x(N/2-round(N/2*ta):N/2+round(N/2*ta))=ones(1,2*round(N/2*ta)+1) y=fft(x,N) figure plot(t,x) title([ 时域信号图 占空比为 ,num2str(ta)]) axis([-T T-0.2 1.2]) xlabel( t /s ) figure subplot(211) f=linspace(-fs/2,fs/2,N) plot(f,abs(fftshift(y))/N) title([ 矩形脉冲双边谱 脉冲时间t=[- ,num2str(ta*T), , ,num2str(ta*T), ] ]) xlabel( f /Hz )
Update
: 2025-02-17
Size
: 1kb
Publisher
:
张红
[
matlab
]
shift1
DL : 0
fftshift 比较实数和复数傅里叶变换频谱的不同,以及N取值对其频谱特点的影响。-fftshift more real and complex Fourier transform spectrum of different, and the N values of the characteristics of its spectrum.
Update
: 2025-02-17
Size
: 1kb
Publisher
:
linve
[
matlab
]
matlab-work
DL : 0
f=zeros(30,30) f(5:24,13:17)=1 imshow(f, notruesize ) F=fft2(f,256,256) F2=fftshift(F) figure,imshow(log(abs(F2)),[-1 5], notruesize ) -f=zeros(30,30) f(5:24,13:17)=1 imshow(f, notruesize ) F=fft2(f,256,256) F2=fftshift(F) figure,imshow(log(abs(F2)),[-1 5], notruesize )
Update
: 2025-02-17
Size
: 35kb
Publisher
:
madlain
[
Special Effects
]
Image-Processing-3
DL : 0
矩形连续函数的傅立叶变换:构建一个矩形函数,对f进行补零,而后进行二维快速傅立叶变换:使变换结果的零频率分量位于中心,调用函数fftshift:映射和重建图像-Fourier transform of rectangular continuous function: for a rectangular function, the zeros of f, then the two-dimensional fast Fourier transform: the transform results of the zero-frequency components in the center, call the function fftshift: mapping and image reconstruction
Update
: 2025-02-17
Size
: 5kb
Publisher
:
edy
[
matlab
]
rectanglePulse
DL : 0
利用函数建立非负矩形脉冲,然后利用频谱分析函数对该矩形脉冲进行频谱分析,并进行频率移位修正(利用FFTSHIFT),观察该脉冲频谱。-Use function to create a non-negative rectangular pulse, and then use the spectral analysis of the rectangular pulse function spectral analysis, and the frequency shift correction (using FFTSHIFT), observed that the pulse spectrum.
Update
: 2025-02-17
Size
: 1kb
Publisher
:
趁黑
[
Other
]
fftshift
DL : 0
在数字信号处理中dft是最常使用的一个数学变换,但是大家总是在使用而没有深入的廖家,老外这篇文章感觉还行,给大家参考下-Dft digital signal processing is the most common use of a mathematical transformation, but we are always in use without depth Liao, foreigners this article feeling okay for everyone to refer to the following
Update
: 2025-02-17
Size
: 100kb
Publisher
:
jljlg
[
Other
]
fftshift
DL : 0
主要是用c语言实现matlab中的fftshift函数的,-Mainly used c language matlab in fftshift function,
Update
: 2025-02-17
Size
: 744kb
Publisher
:
霹雳风暴001
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