User Cris Luengo

20 votes

Accepted

What Is the Difference between Difference of Gaussian, Laplace of Gaussian, and Mexican Hat Wavelet?

answered Mar 17, 2018 at 5:20

13 votes

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Why $y[n] = x[-n]$ is not time-invariant?

answered Apr 4, 2018 at 13:08

8 votes

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Appropriate Gaussian filter parameters when resizing image

answered Jun 26, 2021 at 17:37

7 votes

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Why does the frequency in the DFT have to be an integer?

answered Jun 23, 2018 at 7:34

7 votes

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The Effect of the Finite Radius of Gaussian Kernel

answered Jan 17, 2023 at 19:54

6 votes

What does convolving an image with kernel [1 -2 1] do? How is it different than convolving with the derivative kernel [1 -1]?

answered Oct 1, 2022 at 13:48

6 votes

How to smoothen signal with missing values before differentiation?

answered Mar 30, 2018 at 1:28

6 votes

How Is Laplacian of Gaussian (LoG) Implemented as Four 1D Convolutions?

answered Dec 20, 2018 at 5:26

4 votes

kernel to calculate second order partial derivative of digital image

answered Feb 15, 2021 at 5:56

4 votes

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Are scipy second-order Gaussian derivatives correct?

answered Sep 29, 2021 at 4:22

4 votes

Metric for image sharpness?

answered Jul 1, 2022 at 22:59

4 votes

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How many directions are there in the Non Maximum Suppression part of the Canny Edge Detector

answered Oct 29, 2022 at 21:31

4 votes

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Is there an analogue to the 2D DFT that is rotation equivariant?

answered Nov 6, 2022 at 5:53

4 votes

Discrete Fourier Transform of the Gaussian

answered Jan 13 at 23:48

3 votes

What is the relationship between luminosity of Lab color space and intensity of HSI color space?

answered Jul 24, 2023 at 13:46

3 votes

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What is the type of blurring in such an image?

answered Apr 23 at 17:15

3 votes

Derive the filter mask that corresponds to the double filtering process

answered Apr 24 at 19:13

3 votes

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Border effects / artifacts for spectral filtering of images

answered Jun 4 at 13:39

3 votes

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The Second Derivative of an Image Using the Sobel Filter

answered Jun 24, 2023 at 2:05

3 votes

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How is the inverse Fourier transform of a Hermitian-symmetric input efficiently calculated?

answered Nov 19, 2022 at 18:09

3 votes

Any good alternatives of ImageJ (Fiji)?

answered Jul 26, 2022 at 2:59

3 votes

Hand written DFT vs MATLAB FFT has flipped conjugates?

answered Feb 20, 2020 at 17:19

3 votes

Why Wiener filter is not optimal?

answered Oct 2, 2021 at 15:20

3 votes

Interpreting N in DFT as the Number of Points vs. Number of Intervals

answered Oct 3, 2021 at 5:31

3 votes

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ringing artifacts using FFT-based gaussian blurring

answered Jun 26, 2021 at 20:09

3 votes

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Calculating the numerical gradient of a volume in one direction at a time

answered Aug 14, 2019 at 14:36

3 votes

From Uniform to 2D gaussian

answered Apr 9, 2018 at 13:22

2 votes

Double Threshold Mechanism

answered Apr 18, 2018 at 1:57

2 votes

Accepted

Error due to downsampling an image

answered Feb 1, 2019 at 1:29

2 votes

Is the first derivative operation on a signal a causal system?

answered May 26, 2019 at 14:08

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75 Answers

What Is the Difference between Difference of Gaussian, Laplace of Gaussian, and Mexican Hat Wavelet?

Why $y[n] = x[-n]$ is not time-invariant?

Appropriate Gaussian filter parameters when resizing image

Why does the frequency in the DFT have to be an integer?

The Effect of the Finite Radius of Gaussian Kernel

What does convolving an image with kernel [1 -2 1] do? How is it different than convolving with the derivative kernel [1 -1]?

How to smoothen signal with missing values before differentiation?

How Is Laplacian of Gaussian (LoG) Implemented as Four 1D Convolutions?

kernel to calculate second order partial derivative of digital image

Are scipy second-order Gaussian derivatives correct?

Metric for image sharpness?

How many directions are there in the Non Maximum Suppression part of the Canny Edge Detector

Is there an analogue to the 2D DFT that is rotation equivariant?

Discrete Fourier Transform of the Gaussian

What is the relationship between luminosity of Lab color space and intensity of HSI color space?

What is the type of blurring in such an image?

Derive the filter mask that corresponds to the double filtering process

Border effects / artifacts for spectral filtering of images

The Second Derivative of an Image Using the Sobel Filter

How is the inverse Fourier transform of a Hermitian-symmetric input efficiently calculated?

Any good alternatives of ImageJ (Fiji)?

Hand written DFT vs MATLAB FFT has flipped conjugates?

Why Wiener filter is not optimal?

Interpreting N in DFT as the Number of Points vs. Number of Intervals

ringing artifacts using FFT-based gaussian blurring

Calculating the numerical gradient of a volume in one direction at a time

From Uniform to 2D gaussian

Double Threshold Mechanism

Error due to downsampling an image

Is the first derivative operation on a signal a causal system?