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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>MSER: extremal region.</p>
<p>Extremal regions (ER) are extracted from the region forest. Each region is represented by an instance of this structure. The structures are stored into an array, in arbitrary order.</p>
<p>ER are arranged into a tree. <em>parent</em> points to the parent ER, or to itself if the ER is the root.</p>
<p>An instance of 