1. Method for deriving noise statistical properties (NSP) for a signal (S), a) wherein a distorted signal (DS) originating from an underlying signal (S) to be evaluated is provided (S 1 ), (b) wherein distorted noise statistical properties (DNSP) are derived (S 2 ) from said distorted signal (DS), (c) wherein said distorted noise statistical properties (DNSP) are subjected to a inversion process (S 3 ) with respect to a respective noise model (NM) for said underlying signal (S) to be evaluated, and (d) wherein undistorted noise statistical properties are derived (S 4 ) as said noise statistical properties (NSP) for said underlying undistorted signal (S).