2D/3D frequency domain denoiser.
Requires libfftw3f-3.dll to be in the search path.
Ported from AviSynth plugin http://bengal.missouri.edu/~kes25c/
dfttest.DFTTest(clip clip[, int ftype=0, float sigma=5.0, float sigma2=5.0, float pmin=0.0, float pmax=500.0, int sbsize=12, int smode=1, int sosize=9, int tbsize=5, int tmode=0, int tosize=0, int swin=0, int twin=7, float sbeta=2.5, float tbeta=2.5, bint zmean=True, float f0beta=1.0, string nstring='', string sstring='', string ssx='', string ssy='', string sst='', int[] planes])