From 9cd0c9033f53fb7261616219f19b03de36706d18 Mon Sep 17 00:00:00 2001
From: Maria Dimashova <no@email>
Date: Mon, 2 Jul 2012 12:32:14 +0000
Subject: [PATCH] fixed angles of SURF detector

---
 modules/nonfree/src/surf.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/nonfree/src/surf.cpp b/modules/nonfree/src/surf.cpp
index 2690b3599..d70624e31 100644
--- a/modules/nonfree/src/surf.cpp
+++ b/modules/nonfree/src/surf.cpp
@@ -667,7 +667,7 @@ struct SURFInvoker
                         besty = sumy;
                     }
                 }
-                descriptor_dir = fastAtan2( besty, bestx );
+                descriptor_dir = fastAtan2( -besty, bestx );
             }
             kp.angle = descriptor_dir;
             if( !descriptors || !descriptors->data )