I'm trying to implement fft and gaussian low pass filter multiplication to 16x16 image.
As I know fft can be separable. What if there are 16x16 one image, then is this the same ? between 4x4 part of the whole 16x16 fft result and just only 4x4 fft result?
If they are same then I think that the latter method is more resource efficienciable.