1 ( ) **S SS S** is recognized to be the pseudoinverse (i.e., the well known Moore-Penrouse pseudoinverse) of the SFO matrix **S** .

d. Fourth Step: Restoration of the Trend

Having obtained the estimate ˆ **b**<sup>D</sup> and known the mean value **mb**, we can obtain the optimum RSF estimate (20) simply by adding the prescribed mean value **mb** (referred to as the non-zero trend) to the reconstructed image frame as ˆ **b = mb** + ˆ **b**<sup>D</sup> .
