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Gilles
  • Member for 10 years, 2 months
  • Last seen this week
185 votes
5 answers
65k views

"River" detection in text

  • 1,623
140 votes
8 answers
169k views

Why is the Fourier transform so important?

  • 1,519
126 votes
5 answers
81k views

What does frequency domain denote in case of images?

114 votes
4 answers
47k views

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

  • 15.1k
105 votes
10 answers
89k views

What is the physical significance of negative frequencies?

  • 9,289
102 votes
4 answers
83k views

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

  • 1,137
96 votes
6 answers
189k views

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

  • 2,981
81 votes
4 answers
226k views

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

  • 1,012
75 votes
4 answers
59k views

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

75 votes
9 answers
103k views

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

  • 751
67 votes
8 answers
118k views

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

64 votes
2 answers
33k views

Why so many methods of computing PSD?

  • 3,583
63 votes
6 answers
63k views

What is the distinction between ergodic and stationary?

  • 903
61 votes
6 answers
21k views

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

  • 34.1k
58 votes
5 answers
27k views

Analogous Library to OpenCV for Audio Processing / Analysis

57 votes
8 answers
8k views

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

  • 111
57 votes
9 answers
59k views

Meaning of Hilbert Transform

  • 735
55 votes
5 answers
50k views

What is the difference between convolution and cross-correlation?

  • 805
52 votes
5 answers
72k views

What is the difference between phase delay and group delay?

  • 1,005
50 votes
3 answers
21k views

What is the sparse Fourier transform?

  • 3,583
49 votes
3 answers
21k views

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

  • 491
48 votes
5 answers
10k views

Point Pattern Recognition

  • 1,109
48 votes
3 answers
88k views

Why is the FFT "mirrored"?

  • 915
47 votes
6 answers
50k views

Simplest way of detecting where audio envelopes start and stop

42 votes
6 answers
6k views

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

39 votes
3 answers
51k views

What are the most common algorithms for adaptive thresholding?

  • 5,577
38 votes
4 answers
49k views

Hilbert transform to compute signal envelope?

  • 1,005
37 votes
7 answers
67k views

Understanding the Matched Filter

36 votes
7 answers
6k views

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

  • 469
36 votes
4 answers
13k views

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

  • 779
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