From 5532df75811de862b9837a2198d69d52221a0092 Mon Sep 17 00:00:00 2001
From: Anthony Goeckner <agoeckner@users.noreply.github.com>
Date: Tue, 3 Aug 2021 09:28:37 -0400
Subject: [PATCH] Fixed XFEATURES2D namespace.

The XFEATURES2D module has namespace `cv::xfeatures2d`, not just `xfeatures2d`.
---
 map_merge/src/combine_grids/estimation_internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/map_merge/src/combine_grids/estimation_internal.h b/map_merge/src/combine_grids/estimation_internal.h
index 98c9428..5cd00fa 100644
--- a/map_merge/src/combine_grids/estimation_internal.h
+++ b/map_merge/src/combine_grids/estimation_internal.h
@@ -65,7 +65,7 @@ static inline cv::Ptr<cv::Feature2D> chooseFeatureFinder(FeatureType type)
       return cv::ORB::create();
     case FeatureType::SURF:
 #ifdef HAVE_OPENCV_XFEATURES2D
-      return xfeatures2d::SURF::create();
+      return cv::xfeatures2d::SURF::create();
 #else
       return cv::AKAZE::create();
 #endif