2 files changed, 5 insertions, 1 deletions
diff --git a/libmoped/libs/opencv-tracking/include/feature.h b/libmoped/libs/opencv-tracking/include/feature.h
index f781992..8d1239b 100644
--- a/libmoped/libs/opencv-tracking/include/feature.h
+++ b/libmoped/libs/opencv-tracking/include/feature.h
@@ -22,6 +22,7 @@ public:
     virtual void detect(const cv::Mat& image,
                         std::vector<cv::KeyPoint>& keypoints,
                         const cv::Mat& mask = cv::Mat() ) = 0 ;
+    virtual ~FeatureDetector () {}
 };
 
 /** \class DescriptorExtractor
@@ -53,6 +54,7 @@ class DescriptorExtractor
     */
     virtual void compute_dense(const cv::Mat& image,
                          cv::Mat& descriptors);
+    virtual ~DescriptorExtractor () {}
 };
 
 /** \class DescriptorMatcher
@@ -85,6 +87,7 @@ class DescriptorMatcher
                        std::vector<int>& matches,
                        std::vector<float>& distance) const = 0;
 
+    virtual ~DescriptorMatcher () {}
 };
 
 //typedef std::vector<cv::KeyPoint> KeyPointCollection;
@@ -110,6 +113,7 @@ public:
 
     //! Search for training keypoints in the test image
     virtual void search(const Mat& test_image, vector<KeyPoint>& output_found_points, vector<int>& training_point_indices){};
+    virtual ~DescriptorMatchGeneric () {}
 };
 
 
diff --git a/libmoped/libs/opencv-tracking/include/feature_detector.h b/libmoped/libs/opencv-tracking/include/feature_detector.h
index f343545..433cbf2 100644
--- a/libmoped/libs/opencv-tracking/include/feature_detector.h
+++ b/libmoped/libs/opencv-tracking/include/feature_detector.h
@@ -23,7 +23,7 @@ public:
         keypoints.clear();
         keypoints.resize(corners.size());
 
-        for (int i=0; i<keypoints.size(); ++i){
+        for (int i=0; i<(int)keypoints.size(); ++i){
             keypoints[i] = cv::KeyPoint(corners[i], 1);
         }
     }