From 9130d5bae10e203784a8fe25dd6afe6f2da97652 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Tue, 9 Nov 2010 15:45:56 +0000
Subject: [PATCH] put extra check to cv::findChessboardCorners (ticket #648)

---
 modules/calib3d/src/calibinit.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/calib3d/src/calibinit.cpp b/modules/calib3d/src/calibinit.cpp
index c5c62d7..b6083fa 100644
--- a/modules/calib3d/src/calibinit.cpp
+++ b/modules/calib3d/src/calibinit.cpp
@@ -1904,7 +1904,8 @@ bool findChessboardCorners( const Mat& image, Size patternSize,
     CvMat _image = image;
     bool ok = cvFindChessboardCorners(&_image, patternSize,
         (CvPoint2D32f*)&corners[0], &count, flags ) > 0;
-    corners.resize(count);
+    if(count >= 0)
+        corners.resize(count);
     return ok;
 }
 
-- 
2.7.4