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<p><em>Maximally Stable Extremal Regions (MSER)</em> is a feature
detector; Like the <a href="tut.sift">SIFT detector</a>, the MSER
algorithm extracts from an image <code>I</code> a number of co-variant
regions, called MSERs. An MSER is a <em>stable</em> connected
component of some level sets of the image <code>I</code>. Optionally,
elliptical frames are atta