Image sampling described in (6.86) refers to the acquisition of samples at a point (also known as impulse sampling). Consider a finite-aperture image sampling in which
(a) Express sfa[m, n] in terms of s[m, n] and sc(x, y).
(b) Determine the 2D Fourier transform of sfa[m, n] in terms of 2D continuous Fourier transform of sc(x, y). Compare it with that of s[m, n].
(c) Based on your results in part (b) above, comment on the visual quality of finiteaperture sampling in terms of resolution-loss versus aliasing trade-off.