ray=scale and single precision. Then
<code/><a href=../matlab/vl_covdet.html>vl_covdet</a></code> can be called in order to extract features (by
default this uses the DoG cornerness measure, similarly to SIFT).</p>

<div class="highlight"><pre><span class="n">imgs</span> <span class="p">=</span> <span class="n">im2single</span><span class="p">(</span><span class="n">rgb2gray</span><span class="p">(</span><span class="n">im</span><span class="p">))</span> <span class="p">;</span>
<span class="n">frames</span