.. _feature_flann_matcher: Feature Matching with FLANN **************************** Goal ===== In this tutorial you will learn how to: .. container:: enumeratevisibleitemswithsquare * Use the :flann_based_matcher:`FlannBasedMatcher<>` interface in order to perform a quick and efficient matching by using the :flann:`FLANN<>` ( *Fast Approximate Nearest Neighbor Search Library* ) Theory ====== Code ==== This tutorial code's is shown lines below. You can also download it from `here `_ .. literalinclude:: ../../../../samples/cpp/tutorial_code/features2D/SURF_FlannMatcher.cpp :language: cpp Explanation ============ Result ====== #. Here is the result of the feature detection applied to the first image: .. image:: images/Featur_FlannMatcher_Result.jpg :align: center :height: 250pt #. Additionally, we get as console output the keypoints filtered: .. image:: images/Feature_FlannMatcher_Keypoints_Result.jpg :align: center :height: 250pt