User Gilles

75

votes

4

answers

201k

views

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

Jan 18 '18 at 14:47 Community♦ 1

84

votes

6

answers

158k

views

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

fft zero-padding

Jul 9 '19 at 4:21 hotpaw2 31k

133

votes

8

answers

146k

views

Why is the Fourier transform so important?

fourier-transform

Jul 31 '18 at 21:11 Community♦ 1

64

votes

7

answers

102k

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

69

votes

9

answers

85k

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

94

votes

9

answers

76k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 13.5k

120

votes

6

answers

71k

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

40

votes

3

answers

69k

views

Why is the FFT “mirrored”?

dft

Jun 16 '16 at 7:14 hotpaw2 31k

23

votes

3

answers

67k

views

Variance of White Gaussian Noise

noise power-spectral-density random-process

Jun 16 '18 at 19:08 Royi 14.8k

81

votes

4

answers

65k

views

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

dct dft

Sep 30 '18 at 15:46 Community♦ 1

178

votes

5

answers

63k

views

“River” detection in text

image-processing

May 27 '15 at 20:27 Community♦ 1

45

votes

5

answers

61k

views

What is the difference between phase delay and group delay?

filters audio phase group-delay

Aug 1 at 13:26 Alex Deft 105

6

votes

6

answers

59k

views

Why Carrier signal can't have frequency less than Message signal

frequency modulation

Dec 27 '14 at 13:22 Sufiyan Ghori 1,985

34

votes

6

answers

57k

views

Understanding the Matched Filter

filters digital-communications matched-filter

Oct 11 '18 at 23:07 ancha 1

72

votes

4

answers

54k

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 4,958

54

votes

6

answers

52k

views

What is the distinction between ergodic and stationary?

random ergodic

Nov 28 '19 at 0:10 Community♦ 1

43

votes

6

answers

47k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,377

39

votes

3

answers

46k

views

What are the most common algorithms for adaptive thresholding?

image-processing thresholding

May 13 '16 at 13:56 Community♦ 1

43

votes

8

answers

46k

views

Meaning of Hilbert Transform

signal-analysis hilbert-transform

Aug 14 '19 at 7:45 Matt L. 66.2k

23

votes

2

answers

45k

views

Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers

computer-vision homography camera-pose visual-tracking

Jun 23 '17 at 8:33 Community♦ 1

51

votes

5

answers

45k

views

What is the difference between convolution and cross-correlation?

convolution autocorrelation cross-correlation

Sep 5 at 21:56 Tom Huntington 180

30

votes

4

answers

40k

views

Hilbert transform to compute signal envelope?

audio

Mar 10 '16 at 20:25 mbaitoff 277

32

votes

5

answers

39k

views

Why are Gaussian filters used as low pass filters in image processing?

image-processing

Dec 13 '13 at 8:34 meduz 716

32

votes

4

answers

30k

views

What is the true meaning of a minimum phase system?

filters filter-design minimum-phase

Apr 30 at 11:39 Rodrigo de Azevedo 743

56

votes

2

answers

29k

views

Why so many methods of computing PSD?

frequency-spectrum power-spectral-density

Jul 5 '18 at 7:24 Sagar 1

16

votes

2

answers

28k

views

How do I manually plot the frequency response of a bandpass Butterworth filter in MATLAB without freqz function?

matlab filters filter-design bandpass

Oct 15 '18 at 15:19 jojek♦ 9,729

22

votes

3

answers

28k

views

What is the Gabor filter? And what are its main uses?

filters frequency gabor

Apr 30 at 11:39 Rodrigo de Azevedo 743

20

votes

4

answers

27k

views

Libraries for Voice Activity Detection (Not Speech Recognition)

audio speech

Aug 27 '19 at 16:29 Peter K.♦ 18.7k

6

votes

5

answers

27k

views

Difference between DC component and zero frequency component of signal

fourier-transform frequency-spectrum

Jun 5 at 12:31 Dan Boschen 21.7k

86

votes

3

answers

26k

views

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

fft filters

Feb 17 at 17:40 hotpaw2 31k

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

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

Why is the Fourier transform so important?

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

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

What is the physical significance of negative frequencies?

What does frequency domain denote in case of images?

Why is the FFT “mirrored”?

Variance of White Gaussian Noise

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

“River” detection in text

What is the difference between phase delay and group delay?

Why Carrier signal can't have frequency less than Message signal

Understanding the Matched Filter

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

What is the distinction between ergodic and stationary?

Simplest way of detecting where audio envelopes start and stop

What are the most common algorithms for adaptive thresholding?

Meaning of Hilbert Transform

Step by Step Camera Pose Estimation for Visual Tracking and Planar Markers

What is the difference between convolution and cross-correlation?

Hilbert transform to compute signal envelope?

Why are Gaussian filters used as low pass filters in image processing?

What is the true meaning of a minimum phase system?

Why so many methods of computing PSD?

How do I manually plot the frequency response of a bandpass Butterworth filter in MATLAB without freqz function?

What is the Gabor filter? And what are its main uses?

Libraries for Voice Activity Detection (Not Speech Recognition)

Difference between DC component and zero frequency component of signal

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