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17 Questions

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

Jan 14 '19 at 17:45 Royi 16.3k

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

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 415

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answer

views

Rotating and Shifting image doesn't change FFT2

image-processing fourier-transform

Oct 13 '16 at 13:35 smn 136

vote

answer

views

How to find out if a transform matrix is separable?

image-processing transform linear-algebra separability

Apr 8 at 11:30 Olli Niemitalo 11.7k

vote

answer

views

Magnitude of function in $z$ domain

z-transform magnitude

Dec 1 '16 at 10:54 msm 3,860

votes

answer

views

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

fourier-transform notation

Oct 19 '19 at 6:09 Laurent Duval 25.3k

vote

answer

843

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How to reconstruct signal of its phase and magnitude functions?

signal-analysis fourier-transform phase magnitude

Feb 20 '18 at 13:54 Laurent Duval 25.3k

vote

answer

754

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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

vote

answer

743

views

How do derivative masks work for finding edges in image?

filters edge-detection derivative

Nov 15 '16 at 11:15 Laurent Duval 25.3k

votes

answer

616

views

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

linear-systems

Nov 13 '16 at 15:59 Brethlosze 889

votes

answers

484

views

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

fourier-transform comb

Nov 17 '16 at 20:00 QMC 744

votes

answer

106

views

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

convolution

Dec 22 '16 at 2:14 Peter K.♦ 18.9k

vote

answer

views

For image quantization, is it necessary to sample image?

sampling image quantization

Oct 27 '16 at 15:50 Fat32 23.8k

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 3,878

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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 2,862

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answers

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 289

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17 Questions

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

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

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

Rotating and Shifting image doesn't change FFT2

How to find out if a transform matrix is separable?

Magnitude of function in $z$ domain

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

How to reconstruct signal of its phase and magnitude functions?

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

How do derivative masks work for finding edges in image?

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

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

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

For image quantization, is it necessary to sample image?

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

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

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