Hey,
after looking for a sinc interpolation method based on FFTs, I recently created a small package for it on GitHub which works for both up and downsampling on multi dimensional arrays.
There was also a long discussion about different boundary handlings in this thread.
Since FFT based interpolations are not as flexible as the algorithms of Interpolations.jl, I didn’t include the algorithms there.
I would be happy about feedback what could be fixed, improved and added since I’m not really familiar with digital signal processing
Thanks,
Felix