[Numpy-discussion] Interpolation via Fourier transform

Nadav Horesh nadavh@visionsense....
Thu Mar 5 13:02:10 CST 2009


I apology for this off topic question:

 I have a 2D FT of size N x N, and I would like to reconstruct the original signal with a lower sampling frequency directly (without using an interpolation procedure): Given M < N the goal is to compute a M x M "time domain" signal.

 In the case of 1D signal the trick is simple --- given a length N freq. domain Sig:

  sig = np.fft.ifft(Sig, M)

This trick does not work in 2D:

 sig = np.fft.ifft2(Sig, (M,M))

is far from being the right answer.

 Any ideas?


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