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17 Questions

Votes Activity Newest Views

votes

answers

views

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

Sep 19 at 10:56 user137927 329

vote

answer

views

How to find out if a transform matrix is separable?

image-processing transform linear-algebra separability

Apr 8 '20 at 11:30 Olli Niemitalo 11.8k

votes

answer

views

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

fourier-transform notation

Oct 19 '19 at 6:09 Laurent Duval 26.3k

votes

answer

views

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

image-processing convolution matrix

Jan 14 '19 at 17:45 Royi 19k

votes

answers

views

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

filters lowpass-filter averaging

Dec 28 '18 at 9:44 xxx374562 211

vote

answer

881

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 26.3k

vote

answer

791

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 1,575

vote

answer

114

views

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

convolution

Dec 22 '16 at 2:14 Peter K.♦ 19.2k

votes

answer

views

Magnitude of function in $z$ domain

z-transform magnitude

Dec 1 '16 at 10:54 msm 3,920

votes

answer

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

votes

answer

views

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

filters noise estimation

Nov 30 '16 at 17:28 Atul Ingle 3,896

votes

answers

524

views

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

fourier-transform comb

Nov 17 '16 at 20:00 QMC 754

vote

answer

811

views

How do derivative masks work for finding edges in image?

filters edge-detection derivative

Nov 15 '16 at 11:15 Laurent Duval 26.3k

votes

answer

636

views

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

linear-systems

Nov 13 '16 at 15:59 Brethlosze 919

votes

answers

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

vote

answer

views

For image quantization, is it necessary to sample image?

sampling image quantization

Oct 27 '16 at 15:50 Fat32 24.6k

votes

answer

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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17 Questions

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

How to find out if a transform matrix is separable?

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

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

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

How to reconstruct signal of its phase and magnitude functions?

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

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

Magnitude of function in $z$ domain

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

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

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

How do derivative masks work for finding edges in image?

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

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

For image quantization, is it necessary to sample image?

Rotating and Shifting image doesn't change FFT2