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user 16781
In signal processing, a filter is a device or process that transforms a signal by selectively choosing specific frequencies and leaving others with appropriate gain or as it is.
0
votes
0
answers
65
views
2d fourier based filter on odd image sizes
I am trying to use
$$
f(x, y) (-1)^{x + y} \Leftrightarrow F(u - M/2, v - N/2)
$$
to post-process the result of a Fourier-based filter operation, like so
engine.run<Dft::Direction::Backward>(size, inp …
- 205
4
votes
3
answers
556
views
Efficient algorithm to impose boundary conditions while applying a 2d filter
It is possible to filter an image by using a 2d DFT. This will result in periodic boundary conditions. Now, is it possible to use the DFT to filter an image, while maintaining predefined boundary cond …
- 13.3k
2
votes
How to apply a Butterworth filter to data of varying sample rate?
I can figure out two options:
Interpolate data
Remember that filters are dynamical systems and solve the corresponding ordinary differential equation (ODE)
In the second method, you basically use the …
- 205