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.. _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 <https://github.com/Itseez/opencv/tree/master/samples/cpp/tutorial_code/features2D/SURF_FlannMatcher.cpp>`_
.. 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
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