  This technical report describes the derivation of the asymptotic eigenvalue
distribution for causal 2D-AR models under an upscaling scenario. Specifically,
it tackles the analytical derivation of the asymptotic eigenvalue distribution
of the sample autocorrelation matrix corresponding to genuine and upscaled
images. It also includes the pseudocode of the derived approaches for
resampling detection and resampling factor estimation that are based on this
analysis.
