<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r68501192">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; + * RGB must range in (0.0, 1.0).
&gt; + * @param InImage Input Image in RGB color space.
&gt; + * @param OutImage Ouptut Image in LUV color space.
&gt; + */
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +void StructuredForests&lt;MatType, CubeType&gt;::
&gt; +RGB2LUV(const CubeType&amp; InImage, CubeType&amp; OutImage,\
&gt; +        const arma::vec&amp; table)
&gt; +{
&gt; +  //assert type is double or float.
&gt; +
&gt; +
&gt; +  MatType rgb2xyz;
&gt; +  rgb2xyz &lt;&lt; 0.430574 &lt;&lt; 0.222015 &lt;&lt; 0.020183 &lt;&lt; arma::endr
&gt; +          &lt;&lt; 0.341550 &lt;&lt; 0.706655 &lt;&lt; 0.129553 &lt;&lt; arma::endr
&gt; +          &lt;&lt; 0.178325 &lt;&lt; 0.071330 &lt;&lt; 0.939180;
</pre>
<p>I think what <a href="https://github.com/stereomatchingkiss" class="user-mention">@stereomatchingkiss</a> meant was, that <code>rgb2xyz</code> is unused, so we could delete the parameter.</p>

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