FFT, IFFT, and why do we need FFTSHIFT and IFFTSHIFT? | To Imaging, and Beyond!
The same story is for the Inverse Fourier Transform (ifft2). When the grid with a fixed sampling interval $\delta_f = \frac{1}{N\delta}$ with $N$ samples in the frequency domain, the sum becomes: $ f(\bar{n}) = \delta_f \sum\li...