User Gilles

178

votes

5

answers

63k

views

“River” detection in text

image-processing

May 27 '15 at 20:27 Community♦ 1

134

votes

8

answers

150k

views

Why is the Fourier transform so important?

fourier-transform

Jul 31 '18 at 21:11 Community♦ 1

122

votes

6

answers

72k

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

95

votes

9

answers

78k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 13.7k

90

votes

3

answers

28k

views

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

fft filters

Feb 17 '20 at 17:40 hotpaw2 31.4k

86

votes

6

answers

162k

views

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

fft zero-padding

Jul 9 '19 at 4:21 hotpaw2 31.4k

83

votes

4

answers

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

dct dft

Sep 30 '18 at 15:46 Community♦ 1

76

votes

4

answers

204k

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

73

votes

4

answers

55k

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 4,988

70

votes

9

answers

87k

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

65

votes

7

answers

104k

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

58

votes

2

answers

30k

views

Why so many methods of computing PSD?

frequency-spectrum power-spectral-density

Jul 5 '18 at 7:24 Sagar 1

57

votes

6

answers

19k

views

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

kalman-filters least-squares bayesian-estimation

Mar 9 at 18:57 Florian D 31

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 1,660

55

votes

6

answers

53k

views

What is the distinction between ergodic and stationary?

random ergodic

Nov 28 '19 at 0:10 Community♦ 1

54

votes

4

answers

25k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

Jun 10 '18 at 10:51 Marcus Müller 19.9k

52

votes

5

answers

46k

views

What is the difference between convolution and cross-correlation?

convolution autocorrelation cross-correlation

Sep 5 at 21:56 Tom Huntington 180

49

votes

3

answers

19k

views

What is the sparse Fourier transform?

fourier-transform

Mar 6 '13 at 10:25 Pierre 101

47

votes

5

answers

9k

views

Point Pattern Recognition

image-processing computer-vision image-registration

May 27 '18 at 23:32 Geoff 11

46

votes

3

answers

20k

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

5

answers

63k

views

What is the difference between phase delay and group delay?

filters audio phase group-delay

Aug 1 at 13:26 Alex Deft 105

45

votes

8

answers

47k

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Meaning of Hilbert Transform

signal-analysis hilbert-transform

Aug 14 '19 at 7:45 Matt L. 70k

44

votes

6

answers

48k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,410

42

votes

3

answers

72k

views

Why is the FFT “mirrored”?

dft

Jun 16 '16 at 7:14 hotpaw2 31.4k

41

votes

6

answers

5k

views

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

image-processing wavelet

Aug 28 '16 at 0:26 Laurent Duval 25.3k

39

votes

3

answers

47k

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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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9

answers

13k

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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

7

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22k

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Finding squares in Image

python matlab image-processing opencv computer-vision

Jul 4 '16 at 6:54 Community♦ 1

34

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4

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12k

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

audio algorithms

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34

votes

4

answers

31k

views

What is the true meaning of a minimum phase system?

filters filter-design minimum-phase

Apr 30 at 11:39 Rodrigo de Azevedo 1

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“River” detection in text

Why is the Fourier transform so important?

What does frequency domain denote in case of images?

What is the physical significance of negative frequencies?

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

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

What is the difference between a Fourier transform and a cosine 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 are some good signal and image processing blogs worth following?

What is the distinction between ergodic and stationary?

Analogous Library to OpenCV for Audio Processing / Analysis

What is the difference between convolution and cross-correlation?

What is the sparse Fourier transform?

Point Pattern Recognition

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

What is the difference between phase delay and group delay?

Meaning of Hilbert Transform

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?

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

Finding squares in Image

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

What is the true meaning of a minimum phase system?