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fourier-transform

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17 Questions

Votes Activity Newest Views
7
4
votes
1
answer
8k
views

2D Convolution as a Doubly Block Circulant Matrix Operating on a Vector

image-processing convolution matrix
Jan 14 '19 at 17:45 Royi 17.5k
 
2
votes
1
answer
2k
views

Difference between 2$\pi f$ and $\omega$ in Fourier transform

fourier-transform notation
Oct 19 '19 at 6:09 Laurent Duval 25.6k
 
2
votes
2
answers
497
views

What is the Fourier transform of $\delta(t-a)$

fourier-transform comb
Nov 17 '16 at 20:00 QMC 754
3
2
votes
3
answers
6k
views

Why DTFT coefficients are periodic and why continuous Fourier transform coefficients are not periodic?

discrete-signals fourier-transform continuous-signals dtft
Nov 13 '16 at 5:11 lxg 425
 
1
vote
1
answer
3k
views

How to find out if a transform matrix is separable?

image-processing transform linear-algebra separability
Apr 8 at 11:30 Olli Niemitalo 11.8k
 
1
vote
1
answer
857
views

How to reconstruct signal of its phase and magnitude functions?

signal-analysis fourier-transform phase magnitude
Feb 20 '18 at 13:54 Laurent Duval 25.6k
 
1
vote
1
answer
772
views

Is there any difference between using convolution and correlation for finding edges with Sobel?

filters convolution correlation
Dec 28 '16 at 8:28 ruoho ruotsi 1,565
 
1
vote
1
answer
3k
views

Magnitude of function in $z$ domain

z-transform magnitude
Dec 1 '16 at 10:54 msm 3,890
1
1
vote
1
answer
774
views

How do derivative masks work for finding edges in image?

filters edge-detection derivative
Nov 15 '16 at 11:15 Laurent Duval 25.6k
 
1
vote
1
answer
76
views

For image quantization, is it necessary to sample image?

sampling image quantization
Oct 27 '16 at 15:50 Fat32 24.3k
 
0
votes
0
answers
23
views

Is there anyway to find the frequency of DFT eigenvectors (basis) from its eigenvalues?

fourier-transform frequency eigendecomposition
Sep 19 at 10:56 user137927 309
1
0
votes
3
answers
6k
views

What is the intuition of “averaging is a low pass filter”?

filters lowpass-filter averaging
Dec 28 '18 at 9:44 xxx374562 211
 
0
votes
1
answer
109
views

Convolution of $f(2x)$ and $g(3x)$

convolution
Dec 22 '16 at 2:14 Peter K.♦ 19.1k
 
0
votes
1
answer
36
views

Difference between Fourier transform of $\left(\frac{1}{3}\right)^{-k}$ with $k\le -1$ and $\left(\frac{1}{3}\right)^{k}$ with $k\ge 1$

discrete-signals fourier-transform
Dec 1 '16 at 9:32 Gilles 3,042
 
0
votes
1
answer
74
views

Why is being jointly WSS important in signal estimation with LMMSE estimator?

filters noise estimation
Nov 30 '16 at 17:28 Atul Ingle 3,888
 
0
votes
1
answer
635
views

How to shift input for testing shift invariance in a system?

linear-systems
Nov 13 '16 at 15:59 Brethlosze 899
1
0
votes
1
answer
5k
views

Rotating and Shifting image doesn't change FFT2

image-processing fourier-transform
Oct 13 '16 at 13:35 smn 136
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