Would we have to Zero Pad the Signal to get the last two elements of the Result as to me that seems like the easiest way to get them but I don't know if it results in the correct values. Is there another way to get those last two elements?
I think that would work, although I think that also would introduce additional unintended frequencies.
Like if you look back at the old sine wave examples a few slides ago, if you added 0s to the ends the overall function would not be a sine wave anymore.
Another option would be to wrap around.
Great question @jshergill426! @liboan has a good answer, meaning wrapping. There are a lot of different methods to use, namely mirroring, constant padding (extending the border values), wrapping, etc. Zero-padding will induce vignetting / darkening of the borders due to inducing unnecessary 0 pixel values.