From bce9f54152e9c13e0f648c3d4065ce3f78443e4c Mon Sep 17 00:00:00 2001
From: Stefano Fabri <no@email>
Date: Fri, 2 Jul 2010 17:36:28 +0000
Subject: [PATCH] Corrected Mask operator (from documentation mask must be a
 char matrix with non-zero values in the region of interest)

---
 modules/features2d/src/detectors.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/features2d/src/detectors.cpp b/modules/features2d/src/detectors.cpp
index 69c328acc8..8857c80d11 100644
--- a/modules/features2d/src/detectors.cpp
+++ b/modules/features2d/src/detectors.cpp
@@ -55,7 +55,7 @@ struct MaskPredicate
     MaskPredicate& operator=(const MaskPredicate&) {}
     bool operator() (const KeyPoint& key_pt) const
     {
-      return mask.at<uchar>( (int)(key_pt.pt.y + 0.5f), (int)(key_pt.pt.x + 0.5f) ) != 0;
+      return mask.at<uchar>( (int)(key_pt.pt.y + 0.5f), (int)(key_pt.pt.x + 0.5f) ) == 0;
     }
 
     const Mat& mask;