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fixed bug in knnMatch method
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@ -264,7 +264,7 @@ void DescriptorMatcher::checkMasks( const vector<Mat>& masks, int queryDescripto
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void DescriptorMatcher::knnMatch( const Mat& queryDescriptors, vector<vector<DMatch> >& matches, int knn,
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const vector<Mat>& masks, bool compactResult )
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{
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matches.empty();
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matches.clear();
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if( empty() || queryDescriptors.empty() )
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return;
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