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1,782 posts edited

148 helpful flags

1,467 votes cast

154 Bookmarks

Votes Activity Newest Views Added

179

votes

answers

64k

views

"River" detection in text

image-processing

May 27 '15 at 20:27 CommunityBot 1

138

votes

answers

161k

views

Why is the Fourier transform so important?

fourier-transform

Jul 31 '18 at 21:11 CommunityBot 1

123

votes

answers

77k

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

109

votes

answers

42k

views

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

fft filters

Feb 17 '20 at 17:40 hotpaw2 32.6k

102

votes

answers

83k

views

What is the physical significance of negative frequencies?

frequency

Jul 6 '18 at 18:51 endolith 14.6k

votes

answers

74k

views

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

dct dft

Sep 30 '18 at 15:46 CommunityBot 1

votes

answers

174k

views

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

fft zero-padding

Jul 9 '19 at 4:21 hotpaw2 32.6k

votes

answers

215k

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 CommunityBot 1

votes

answers

58k

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 5,058

votes

answers

96k

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 CommunityBot 1

votes

answers

111k

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 CommunityBot 1

votes

answers

31k

views

Why so many methods of computing PSD?

frequency-spectrum power-spectral-density

Jul 5 '18 at 7:24 Sagar 1

votes

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 3,510

votes

answers

58k

views

What is the distinction between ergodic and stationary?

random ergodic

Aug 4 at 18:41 Dilip Sarwate 17.8k

votes

answers

views

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

image-processing

Apr 6 '17 at 20:14 MimSaad 1,764

votes

answers

26k

views

Analogous Library to OpenCV for Audio Processing / Analysis

image-processing audio

Jun 10 '18 at 10:51 Marcus Müller 23k

votes

answers

48k

views

What is the difference between convolution and cross-correlation?

convolution autocorrelation cross-correlation

Sep 5 '20 at 21:56 Tom Huntington 290

votes

answers

53k

views

Meaning of Hilbert Transform

signal-analysis hilbert-transform

Mar 17 at 0:17 hotpaw2 32.6k

votes

answers

20k

views

What is the sparse Fourier transform?

fourier-transform

Mar 6 '13 at 10:25 Pierre 101

votes

answers

68k

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

votes

answers

21k

views

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

image-processing computer-vision

Sep 21 at 16:39 CommunityBot 1

votes

answers

10k

views

Point Pattern Recognition

image-processing computer-vision image-registration

May 27 '18 at 23:32 Geoff 11

votes

answers

49k

views

Simplest way of detecting where audio envelopes start and stop

filters audio filter-design

Jan 6 '14 at 19:22 lennon310 3,510

votes

answers

79k

views

Why is the FFT "mirrored"?

dft

Jun 16 '16 at 7:14 hotpaw2 32.6k

votes

answers

views

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

image-processing wavelet

Aug 28 '16 at 0:26 Laurent Duval 27.6k

votes

answers

50k

views

What are the most common algorithms for adaptive thresholding?

image-processing thresholding

May 13 '16 at 13:56 CommunityBot 1

votes

answers

63k

views

Understanding the Matched Filter

filters digital-communications matched-filter

Oct 11 at 14:57 Lewis Kelsey 207

votes

answers

13k

views

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

audio algorithms

Apr 23 '18 at 18:29 Scoodood 153

votes

answers

views

What is the most lucid, intuitive explanation for the various FTs - CFT, DFT, DTFT and the Fourier Series?

fourier-transform fourier-series

Aug 31 at 23:36 Steve Tjoa 416

votes

answers

34k

views

What is the true meaning of a minimum phase system?

filters filter-design minimum-phase

Apr 30 '20 at 11:39 Rodrigo de Azevedo 777

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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?

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

Point Pattern Recognition

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?

Understanding the Matched Filter

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

What is the most lucid, intuitive explanation for the various FTs - CFT, DFT, DTFT and the Fourier Series?

What is the true meaning of a minimum phase system?