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\section{Methods}  The simplest form of the \textsc{skv} algorithm was used for all the results in this paper. Some For  resultsare  derived from monochrome imageswhere  each pixel is defined by three values $i,j,k$ where $i$ and $j$ are the row and column respectively, and $k$ is the value of the pixel on the greyscale from 0 (black) to 1 (white). Images are processed on a pixel-by-pixel basis and the \textsc{skv} value of each pixels is calculated thus: \begin{enumerate}  \item extract a window of $n$ pixels $[i,j; i+1,j; i+n,j]$  \end{enumerate}