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\section{Methods}  \subsection{Algorithm}  For results derived from monochrome images each pixel is defined by three values; two coordinates $i$ and $j$, and a single value $k$ that is the value of the pixel on the gray-scale from 0 (black) to 1 (white). Images are processed on a pixel-by-pixel basis and the \textsc{skv} value of each pixels pixel $\gamma_{i,j}$  is calculated thus: \begin{enumerate}  \item the number of pixels $m$ corresponding to half the required window size $w$ is calculated: $m = \mathrm{floor}(\frac{w}{2})$  \item hence the working window size is $n = 2 \cdot m+1$ even when this differs from $w$ by one