Reduce delay for marker detection

src/modules/DepthCamModule.cpp

@@ -1437,7 +1437,7 @@ void DepthCamModule::filterMarkers(vector<vector<cv::Point2f> >& cor,
     time(&now);
     map<int, s_markerAndTime>::iterator itAl = m_aliveMarkers.begin();
     for(; itAl!=m_aliveMarkers.end();) {
-        if(difftime(now, itAl->second.detection) > 1) {
+        if(difftime(now, itAl->second.detection) > 0.2) {
             m_removedMarkers.push_back(itAl->second);
             itAl = m_aliveMarkers.erase(itAl);
         }