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13.3.5.2.4 South
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13.3.5.2 Gradient Detection (Embossing)
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13.3.5.2.2 West
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13.3.5.2.3 East
2001-01-10
![\begin{displaymath}
\left[
\begin{array}{r r r}
1 & 0 & -1 \\
2 & 0 & -2 \\
1 & 0 & -1 \\
\end{array}
\right]
\end{displaymath}](img405.gif)