>      Has anyone used i.fft and i.ifft to remove periodic or stationary
> noise from a GRASS image?
> 
> William W. Hargrove              (615) 574-1902
> hnw@mtqgrass.esd.ornl.gov        (615) 576-8646 (fax)
> --------------------------------------------------------------
> 
Yeah, we did a test in which we removed periodic noise from an aerial
photograph showing traces of a Roman villa. The noise was mainly related
to plough furrows and could be removed by applying a mask (created in
r.digit) over the Fourier image, then Inverse transforming. The results
were reasonably satisfactory...

Martijn van Leusen

