From d95bf478fea7b44a5116ac7cd0d12a1737654c04 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Wed, 27 Apr 2011 06:59:59 +0000
Subject: [PATCH] fixed corners emptiness check in drawChessboardCorners
 (thanks to thomask)

---
 modules/calib3d/src/calibinit.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/calib3d/src/calibinit.cpp b/modules/calib3d/src/calibinit.cpp
index 15645b87fe..074b917fb8 100644
--- a/modules/calib3d/src/calibinit.cpp
+++ b/modules/calib3d/src/calibinit.cpp
@@ -1917,7 +1917,7 @@ void cv::drawChessboardCorners( InputOutputArray _image, Size patternSize,
                             bool patternWasFound )
 {
     Mat corners = _corners.getMat();
-    if( !corners.empty() )
+    if( corners.empty() )
         return;
     CvMat c_image = _image.getMat();
     int nelems = corners.checkVector(2, CV_32F, true);