[Scilab-users] Surface smoothing in Scilab, immune to outliers

[Samuel Gougeon]

Le 04/03/2013 13:23, Dang, Christophe a écrit :
> .../...
>
> I personally would try Fourier filtering:
> a strong outlier means a steep slope
> and therefore correspond to a high frequency.
>
> Thus fft2, set high frequencies to 0
> (with possibly a smooth transition),
> then inverse fft2 -- ifft2 does not exist, I never used 2-dimension
> Fourier transform so I don't know if the inverse is easy to perform...
frequency-wise multiplication of 2 spectra is equivalent to
convoluting both respectives functions (in the direct spaces).

Samuel