... spectrumof the original image are the same as in the previous case, i.e., Eqs. (29.72), (29.73) and (29.74) holdtrue. The other two unknowns, i.e., the variance of the additive noise and the DFT of the ... somewhatfromthe original formulationoftheidentification problemby assuming that the blur function is known. The problem at hand then is the restoration of the noisy-blurred image. Although there are ... case the phase of the DFT of {d(p,q)} is zeroor ±π. Unfortunately, uniqueness of the ML solution is not always established by the symmetryassumption, dueprimarily tothephaseambiguity. Therefore,additionalconstraints...