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16 Questions

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5

2

votes

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

image-processing convolution matrix

Jan 14 '19 at 17:45 Royi 12.6k

1

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3

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5k

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

filters lowpass-filter averaging

Dec 28 '18 at 9:44 xxx374562 91

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3

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5k

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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 405

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1

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4k

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Rotating and Shifting image doesn't change FFT2

image-processing fourier-transform

Oct 13 '16 at 13:35 smn 136

1

vote

1

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3k

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How to find out if a transform matrix is separable?

image-processing transform linear-algebra separability

Nov 6 '16 at 22:29 Community♦ 1

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1

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2k

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Magnitude of function in $z$ domain

z-transform magnitude

Dec 1 '16 at 10:54 msm 3,698

2

votes

1

answer

2k

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

fourier-transform notation

Oct 19 at 6:09 Laurent Duval 20.9k

1

vote

1

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739

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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 20.9k

1

vote

1

answer

654

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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 1,555

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1

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600

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How do derivative masks work for finding edges in image?

filters edge-detection derivative

Nov 15 '16 at 11:15 Laurent Duval 20.9k

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1

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560

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

linear-systems

Nov 13 '16 at 15:59 Brethlosze 849

2

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2

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397

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

fourier-transform comb

Nov 17 '16 at 20:00 Qasim Chaudhari 704

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1

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94

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

convolution

Dec 22 '16 at 2:14 Peter K.♦ 18.2k

1

vote

1

answer

74

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For image quantization, is it necessary to sample image?

sampling image quantization

Oct 27 '16 at 15:50 Fat32 21.1k

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70

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

filters noise estimation

Nov 30 '16 at 17:28 Atul Ingle 3,768

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34

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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 2,356

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