User Gilles

179

votes

5

answers

64k

views

“River” detection in text

image-processing

May 27 '15 at 20:27 Community♦ 1

137

votes

8

answers

158k

views

Why is the Fourier transform so important?

fourier-transform

Jul 31 '18 at 21:11 Community♦ 1

122

votes

5

answers

76k

views

What does frequency domain denote in case of images?

image-processing frequency-spectrum dft

Dec 13 '18 at 7:52 ชื่อ เท่ห์ รุ้ยัง 1

107

votes

3

answers

41k

views

Why is it a bad idea to filter by zeroing out FFT bins?

fft filters

Feb 17 '20 at 17:40 hotpaw2 32.4k

100

votes

9

answers

82k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 14.4k

91

votes

4

answers

73k

views

What is the difference between a Fourier transform and a cosine transform?

dct dft

Sep 30 '18 at 15:46 Community♦ 1

90

votes

6

answers

172k

views

Why should I zero-pad a signal before taking the Fourier transform?

fft zero-padding

Jul 9 '19 at 4:21 hotpaw2 32.4k

78

votes

4

answers

213k

views

What is meant by a system's “impulse response” and “frequency response?”

frequency impulse-response linear-systems frequency-response

Jan 18 '18 at 14:47 Community♦ 1

74

votes

4

answers

57k

views

What are some free alternatives to SIFT/ SURF that can be used in commercial applications?

image-processing computer-vision local-features sift

Jun 15 '17 at 15:49 Tolga Birdal 5,028

72

votes

9

answers

94k

views

Why do we use the HSV colour space so often in vision and image processing?

image-processing computer-vision

Sep 22 '19 at 21:49 Community♦ 1

66

votes

7

answers

110k

views

How do I implement cross-correlation to prove two audio files are similar?

audio fft waveform-similarity cross-correlation

Oct 30 '19 at 6:38 Community♦ 1

61

votes

2

answers

31k

views

Why so many methods of computing PSD?

frequency-spectrum power-spectral-density

Jul 5 '18 at 7:24 Sagar 1

58

votes

6

answers

20k

views

What Is the Relationship Between a Kalman Filter and Polynomial Regression?

kalman-filters least-squares bayesian-estimation

Feb 23 at 6:03 lennon310 3,480

57

votes

6

answers

57k

views

What is the distinction between ergodic and stationary?

random ergodic

Nov 28 '19 at 0:10 Community♦ 1

56

votes

8

answers

7k

views

What are some good signal and image processing blogs worth following?

image-processing

Apr 6 '17 at 20:14 MimSaad 1,724

55

votes

4

answers

25k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

Jun 10 '18 at 10:51 Marcus Müller 22.4k

52

votes

5

answers

47k

views

What is the difference between convolution and cross-correlation?

convolution autocorrelation cross-correlation

Sep 5 at 21:56 Tom Huntington 290

50

votes

8

answers

52k

views

Meaning of Hilbert Transform

signal-analysis hilbert-transform

Mar 17 at 0:17 hotpaw2 32.4k

49

votes

3

answers

20k

views

What is the sparse Fourier transform?

fourier-transform

Mar 6 '13 at 10:25 Pierre 101

49

votes

5

answers

67k

views

What is the difference between phase delay and group delay?

filters audio phase group-delay

Aug 1 '20 at 13:26 Alex Deft 105

47

votes

5

answers

10k

views

Point Pattern Recognition

image-processing computer-vision image-registration

May 27 '18 at 23:32 Geoff 11

47

votes

3

answers

21k

views

What algorithm does Google use for its “Search By Image” site?

image-processing computer-vision

Apr 4 '17 at 14:38 Community♦ 1

46

votes

6

answers

49k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,480

42

votes

3

answers

78k

views

Why is the FFT “mirrored”?

dft

Jun 16 '16 at 7:14 hotpaw2 32.4k

41

votes

6

answers

5k

views

What Properties Make Certain Wavelets “Better” Than Others In Image Compression?

image-processing wavelet

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39

votes

3

answers

49k

views

What are the most common algorithms for adaptive thresholding?

image-processing thresholding

May 13 '16 at 13:56 Community♦ 1

35

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4

answers

12k

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What are good ways to detect signal clipping in a recording?

audio algorithms

Apr 23 '18 at 18:29 Scoodood 153

35

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4

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33k

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What is the true meaning of a minimum phase system?

filters filter-design minimum-phase

Apr 30 '20 at 11:39 Rodrigo de Azevedo 759

35

votes

9

answers

13k

views

Is there an algorithm for finding a frequency without DFT or FFT?

audio fft frequency dft

Oct 10 '18 at 2:30 Bizhou Ge 1

34

votes

5

answers

5k

views

What factors should I consider in choosing an edge detection algorithm?

algorithms image-processing edge-detection

Oct 10 '19 at 8:17 Olli Niemitalo 11.9k

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“River” detection in text

Why is the Fourier transform so important?

What does frequency domain denote in case of images?

Why is it a bad idea to filter by zeroing out FFT bins?

What is the physical significance of negative frequencies?

What is the difference between a Fourier transform and a cosine transform?

Why should I zero-pad a signal before taking the Fourier transform?

What is meant by a system's “impulse response” and “frequency response?”

What are some free alternatives to SIFT/ SURF that can be used in commercial applications?

Why do we use the HSV colour space so often in vision and image processing?

How do I implement cross-correlation to prove two audio files are similar?

Why so many methods of computing PSD?

What Is the Relationship Between a Kalman Filter and Polynomial Regression?

What is the distinction between ergodic and stationary?

What are some good signal and image processing blogs worth following?

Analogous Library to OpenCV for Audio Processing / Analysis

What is the difference between convolution and cross-correlation?

Meaning of Hilbert Transform

What is the sparse Fourier transform?

What is the difference between phase delay and group delay?

Point Pattern Recognition

What algorithm does Google use for its “Search By Image” site?

Simplest way of detecting where audio envelopes start and stop

Why is the FFT “mirrored”?

What Properties Make Certain Wavelets “Better” Than Others In Image Compression?

What are the most common algorithms for adaptive thresholding?

What are good ways to detect signal clipping in a recording?

What is the true meaning of a minimum phase system?

Is there an algorithm for finding a frequency without DFT or FFT?

What factors should I consider in choosing an edge detection algorithm?