From 3e1b0186feabcf2f963ce93806ffa15d21823e5d Mon Sep 17 00:00:00 2001
From: Vincent Rabaud <no@email>
Date: Fri, 1 Jul 2011 01:28:14 +0000
Subject: [PATCH] - make sure we don't crash for an empty image

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

diff --git a/modules/features2d/src/orb.cpp b/modules/features2d/src/orb.cpp
index d28b20c1b7..90b1655f6c 100644
--- a/modules/features2d/src/orb.cpp
+++ b/modules/features2d/src/orb.cpp
@@ -532,7 +532,7 @@ void ORB::operator()(const cv::Mat &image, const cv::Mat &mask, std::vector<cv::
 void ORB::operator()(const cv::Mat &image_in, const cv::Mat &mask, std::vector<cv::KeyPoint> & keypoints_in_out,
                      cv::Mat & descriptors, bool do_keypoints, bool do_descriptors)
 {
-  if ((!do_keypoints) && (!do_descriptors))
+  if (((!do_keypoints) && (!do_descriptors)) || (image_in.empty()))
     return;
 
   cv::Mat image;