<p>In <a href="https://github.com/mlpack/mlpack/pull/696#discussion_r67179551">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + // do same for dy.
> + dy.slice(i).row(0) = InImage.slice(i).row(1) - InImage.slice(i).row(0);
> + dy.slice(i).row(InImage.n_rows - 1) = InImage.slice(i).row(InImage.n_rows - 1)
> + - InImage.slice(i).row(InImage.n_rows - 2);
> +
> + for (size_t j = 1; j < InImage.n_rows-1; j++)
> + dy.slice(i).row(j) = 0.5 * ( InImage.slice(i).row(j+1) - InImage.slice(i).row(j) );
> + }
> +
> + CubeType mag(InImage.n_rows, InImage.n_cols, InImage.n_slices);
> + for (size_t i = 0; i < InImage.n_slices; ++i)
> + {
> + mag.slice(i) = arma::sqrt( arma::square \
> + ( dx.slice(i) + arma::square( dy.slice(i) ) ) );
> + }
> +
</pre>
<p>Do you think we could use the sobel convolution kernel here? </p>
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