   artoolkitplus
  helloI'm creating an application with artoolkitplus.I use  two maps <> stl and i do do a difference between the number of markers present previously and those currently recognized.My problem is that sometimes I have a quick recognition and quick loss recognition of markers.For each marker i have associated a class CMarker, what I thought was to use a variable that records the time since it was "lost sight of" the last time, and if this value exceeds a certain threshold is destroyed and removed from maps , so that if the marker is not recognized for a split second I don't have  to re-create the marker and add it and  remove from the maps.often it happens that a marker is lost for a fraction of a second and then is immediately recognized.And 'maybe wrong the use of maps or the use of the difference between the two containers?Advice?   