reject
matches that are too ambiguous.
</p><p>
<a href="vl_ubcmatch.html">VL_UBCMATCH</a>(DESCR1, DESCR2, THRESH) uses the specified threshold
THRESH. A descriptor D1 is matched to a descriptor D2 only if the
distance d(D1,D2) multiplied by THRESH is not greater than the
distance of D1 to all other descriptors. The default value of
THRESH is 1.5.
</p><p>
The storage class of the descriptors can be either DOUBLE, FLOAT,
INT8 or UINT8. Usually integer classes are faster.
</p><dl><dt>
REFERENCES
</dt><dd><p>
[