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13.3.5.2.5 Northeast
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13.3.5.2 Gradient Detection (Embossing)
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13.3.5.2.3 East
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13.3.5.2.4 South
2001-01-10
![\begin{displaymath}
\left[
\begin{array}{r r r}
1 & 2 & 1 \\
0 & 0 & 0 \\
-1 & -2 & -1 \\
\end{array}
\right]
\end{displaymath}](img406.gif)