<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66467361">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + MatType nz(InImage.n_rows, InImage.n_cols);
> +
> + nz = 1.0 / ( xyz.slice(0) + (15 * xyz.slice(1) ) +
> + (3 * xyz.slice(2) + EPS));
> +
> + MatType L = arma::reshape(L, xyz.n_rows, xyz.n_cols);
> +
> + MatType U, V;
> + U = L % (13 * 4 * (xyz.slice(0) % nz) - 13 * 0.197833) + 88 * maxi;
> + V = L % (13 * 9 * (xyz.slice(1) % nz) - 13 * 0.468331) + 134 * maxi;
> +
> + CubeType OutImage(InImage.n_rows, InImage.n_cols, InImage.n_slices);
> + OutImage.slice(0) = L;
> + OutImage.slice(1) = U;
> + OutImage.slice(2) = V;
> + //OutImage = arma::join_slices(L,U);
</pre>
<p>Why not just put the LUV channels in the OutImage?</p>
<p>CubeType OutImage(InImage.n_rows, InImage.n_cols, InImage.n_slices);<br>
OutImage.slice(0) = //?<br>
OutImage.slice(1) = OutImage.slice(0) % (13 * 4 * (xyz.slice(0) % nz) - 13 * 0.197833) + 88 * maxi;<br>
OutImage.slice(2) = OutImage.slice(0) % (13 * 9 * (xyz.slice(1) % nz) - 13 * 0.468331) + 134 * maxi; </p>
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