by</p>
<div class="fragment"><div class="line"><span class="keywordtype">double</span> sigma = vl_scalespace_get_sigma(ss, o, s) ;</div>
</div><!-- fragment --><p>The resolution of <code>level</code> is in general different from the resolution of <code>image</code> and is determined by the octave <code>o</code>. It can be obtained as follows:</p>
<div class="fragment"><div class="line"><a class="code" href="structVlScaleSpaceOctaveGeometry.html">VlScaleSpaceOctaveGeometry</a> ogeom = <a class="code" href="s