let us assume that:
f is a grayscale image of size NxN, and F is the Fourier transform of f.
G is a 2Nx2N transform obtained by inserting 0 between every value in F:
What is the inverse transform of G?
solution: so i have programmed it, and the picture will be 4 times bigger with the picture 4 times in it. g= [f f;f f] can you please explain why this is the answer?