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MATCHES = <a href="vl_ubcmatch.html">VL_UBCMATCH</a>(DESCR1, DESCR2) matches the two sets of SIFT
descriptors DESCR1 and DESCR2.
</p><p>
[MATCHES,SCORES] = <a href="vl_ubcmatch.html">VL_UBCMATCH</a>(DESCR1, DESCR2) retuns the matches and
also the squared Euclidean distance between the matches.
</p><p>
The function uses the algorithm suggested by D. Lowe [1] to 