<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66475381">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + double const y2_cross_x = y_diff_2 * x_diff;
> + double const y_cross_x2 = y_diff * x_diff_2;
> + double const y_cross_x = y_diff * x_diff;
> + dst(row, col) = y2_cross_x2 * src(y, x) +
> + y2_cross_x * src(y, x + 1) +
> + y_cross_x2 * src(y + 1, x) +
> + y_cross_x * src(y + 1, x + 1);
> + }
> + }
> +
> + return dst;
> +}
> +
> +template<typename MatType, typename CubeType>
> +CubeType StructuredForests<MatType, CubeType>::
> +sepFilter2D(CubeType& InImage, arma::vec& kernel, int radius)
</pre>
<p><code>sepFilter2D(CubeType& InImage, const arma::vec &kernel, const int radius)</code></p>
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