he distance between coordinates (which is measured
     in Pixels)!</dd>
<dd><code>mask</code> - Mask specifying permissible matches between an input query and train matrices of
     descriptors.

     For each query descriptor, the methods find such training descriptors that the distance between the
     query descriptor and the training descriptor is equal or smaller than maxDistance. Found matches are
     returned in the distance increasing order.</dd>
</dl>
</li>
</ul>
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