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\subsection{Hybrid images and multi-scale processing}  It has been shown that static images can be produced with two interpretations which change as a function of viewing distance. These \textit{Hybrid Images} are based on the multiscale processing by the human visual system and are motivated by masking studies in visual perception \cite{Oliva_2006}. As a test case for the \textsc{skv} representation, (whose only free parameter, the window size, corresponds in some ways to the scale of the salient detail) it was decided to choose two examples from \citet{Oliva_2006} of hybrid images and process them using small and large window sizes.