--- a/c/Motion.cpp	Sat Jul 25 22:36:39 2015 -0400
+++ b/c/Motion.cpp	Sat Jul 25 23:28:52 2015 -0400
@@ -188,7 +188,7 @@
 #endif
 
   vector<unsigned int> lastInstants(num, 0); // last instant of component with id
-  vector<vector<vertex_descriptor> > tmpobjects(num), objects; // vector of components (component = vector of vertex descriptors)
+  vector<vector<vertex_descriptor> > tmpobjects(num); // vector of components (component = vector of vertex descriptors)
 
   graph_traits<UndirectedGraph>::vertex_iterator vi, vend;
   for(boost::tuples::tie(vi,vend) = vertices(graph); vi != vend; ++vi) {
@@ -215,24 +215,25 @@
     unsigned int totalFeatureTime= graph[objectHypotheses[i][0]].feature->length();
     unsigned int firstInstant = graph[objectHypotheses[i][0]].feature->getFirstInstant();
     unsigned int lastInstant = graph[objectHypotheses[i][0]].feature->getLastInstant();
-      for (unsigned int j=1; j<objectHypotheses[i].size(); ++j) {
-	totalFeatureTime += graph[objectHypotheses[i][j]].feature->length();
-	firstInstant = MIN(firstInstant, graph[objectHypotheses[i][j]].feature->getFirstInstant());
-	lastInstant = MAX(lastInstant, graph[objectHypotheses[i][j]].feature->getLastInstant());	
-      }
-    if (static_cast<float>(totalFeatureTime)/static_cast<float>(lastInstant-firstInstant+1) > minNFeaturesPerGroup) {
+    for (unsigned int j=1; j<objectHypotheses[i].size(); ++j) {
+      totalFeatureTime += graph[objectHypotheses[i][j]].feature->length();
+      firstInstant = MIN(firstInstant, graph[objectHypotheses[i][j]].feature->getFirstInstant());
+      lastInstant = MAX(lastInstant, graph[objectHypotheses[i][j]].feature->getLastInstant());	
+    }
+    bool saveFeatureGroup = (static_cast<float>(totalFeatureTime)/static_cast<float>(lastInstant-firstInstant+1) > minNFeaturesPerGroup);
 #if DEBUG
-      cout << "save group " << i << " of " << objectHypotheses[i].size() << " features " << endl;
+    cout << "save group " << i << " of " << objectHypotheses[i].size() << " features " << endl;
 #endif
+    if (saveFeatureGroup)
       featureGroups.push_back(vector<FeatureTrajectoryPtr>());
-      for (unsigned int j=0; j<objectHypotheses[i].size(); ++j) {
+    for (unsigned int j=0; j<objectHypotheses[i].size(); ++j) {
+      if (saveFeatureGroup)
 	featureGroups.back().push_back(graph[objectHypotheses[i][j]].feature);
 #if DEBUG
-	cout << featureGroups.size() << " " << objectHypotheses[i][j] << endl;
+      cout << featureGroups.size() << " " << objectHypotheses[i][j] << endl;
 #endif
-	clear_vertex(objectHypotheses[i][j], graph);
-	remove_vertex(objectHypotheses[i][j], graph);
-      }
+      clear_vertex(objectHypotheses[i][j], graph);
+      remove_vertex(objectHypotheses[i][j], graph);
     }
   }
 }