ARToolkit

hi to all,have a nice day
in your great respect i am going to asking a question about ARTOOL kit in OPen gl
we have a problem in converting the coordinates of marker which we get through ARTOOLKIT then we want to convert these coordinates to OPENGL
on behalf to draw points with respect to these coordinates on open gl window,now we have a problem of mapping these coordinates which show flicking or does not give the exact position in the open gl window respect to the detected marker.
i am waiting of your positive response thanks