“…[10] for each group, it is possible to calculate the autocorrelation function for the group-averaged images. For the discrete case, this is given by [22], [20], [27], [26] Between Group Test for spectral equality [10], [11], [28] Improved estimate of difference Estimated SDF, equal var [30], [31], [32], [33], [26] Estimated SDF, unequal var [22], [23], [34], [26] Known SDF, unequal var [20], [34], [35], [26] Known SDF, equal var [20], [24], [33], [26] Linear discriminant function Estimated SDF [10], [11], [24], [37], [38] Known SDF [20], [24], [37], [38] a SDF ϭ spectral density function.…”