Zero-padding or Interpolation in 3D FFT

1. Does zero padding affect FFT?
2. Does zero padding improve FFT resolution?
3. What is the use of zero padding in FFT?
4. What is interpolation in FFT?

Does zero padding affect FFT?

Zero padding allows one to use a longer FFT, which will produce a longer FFT result vector. A longer FFT result has more frequency bins that are more closely spaced in frequency.

Does zero padding improve FFT resolution?

Zero padding enables you to obtain more accurate amplitude estimates of resolvable signal components. On the other hand, zero padding does not improve the spectral (frequency) resolution of the DFT. The resolution is determined by the number of samples and the sample rate.

What is the use of zero padding in FFT?

In addition to making the total number of samples a power of two so that faster computation is made possible by using the fast Fourier transform (FFT), zero padding can lead to an interpolated FFT result, which can produce a higher display resolution.

What is interpolation in FFT?

FFT interpolation is based on adding zeros at higher frequencies of the Fourier coefficient vector. In such way, the inverse FFT will produce more output, using the same non-zero Fourier coefficients.