fixed bug in knnMatch method

diff --git a/modules/features2d/src/matchers.cpp b/modules/features2d/src/matchers.cpp
index e363c71..27f52a4 100755 (executable)
--- a/modules/features2d/src/matchers.cpp
+++ b/modules/features2d/src/matchers.cpp
@@ -264,7 +264,7 @@ void DescriptorMatcher::checkMasks( const vector<Mat>& masks, int queryDescripto
 void DescriptorMatcher::knnMatch( const Mat& queryDescriptors, vector<vector<DMatch> >& matches, int knn,
                                   const vector<Mat>& masks, bool compactResult )
 {
-       matches.empty();
+        matches.clear();
        if( empty() || queryDescriptors.empty() )
                return;