<span class="p">[</span><span class="n">frames</span><span class="p">,</span> <span class="n">descrs</span><span class="p">]</span> <span class="p">=</span> <span class="n">vl_covdet</span><span class="p">(</span><span class="n">imgs</span><span class="p">)</span> <span class="p">;</span>
</pre></div>


<p>This will compute SIFT descriptors for all the features. Each
column of <code/>descrs</code> is a 128-dimensional descriptor vector
in single precision. Alternatively, to compute patches use:</p>

<div cl