FFT-based convolution

Discrete convolution using FFT method
Aktualisiert 14 Jun 2021

Lizenz anzeigen

As opposed to Matlab CONV, CONV2, and CONVN implemented as straight forward sliding sums, CONVNFFT uses Fourier transform (FT) convolution theorem, i.e. FT of the convolution is equal to the product of the FTs of the input functions.
In 1-D, the complexity is O((na+nb)*log(na+nb)), where na/nb are respectively the lengths of A and B.
Optional arguments to control the dimension(s) along which convolution is carried out.
Slightly less accurate than sliding sum convolution.
Good usage recommendation:
In 1D, this function is faster than CONV for nA, nB > 1000.
In 2D, this function is faster than CONV2 for nA, nB > 20.
In 3D, this function is faster than CONVN for nA, nB > 5.

Zitieren als

Bruno Luong (2024). FFT-based convolution (https://www.mathworks.com/matlabcentral/fileexchange/24504-fft-based-convolution), MATLAB Central File Exchange. Abgerufen .

Kompatibilität der MATLAB-Version
Erstellt mit R2009a
Kompatibel mit allen Versionen
Windows macOS Linux
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Version Veröffentlicht Versionshinweise

Fix bug when calling with syntax CONV2FFT(H1, H2, A, SHAPE)

Installation script use now right mex compilation options for R2018a or later

Make inplaceprod compatible with interleaved complex

Add the syntax conv2fft(H1, H2, A, ...)

Option allows to disable padding to next power-two. Mex implement inplace product that saves about 1/3 memory. These two enhancement might be useful when perform convolution with very large arrays.

GPU unable by default + changes in help section

GPU/Jacket capable

correct bug when ndims(A)<ndims(B)