How to use this example:
1. 
Build it.

2. 
Print the marker file 
/<openrobotino_dir>/external/artoolkit/2_72/data/printout/patthiro.pdf
on paper scaled to about 8cm sidelength.

3.
WARNING! It is possible that Robotino tries to run off
on high velocities due to glitches in the marker tracking!
Test on resting plate first!

Run the program, enter your Robotino's IP adress and click connect.

If you present it with the printout of the marker, Robotino will detect it
and stay in front of it at a certain distance.
Successful detection is indicated by a red rectangle at the center of the
marker.

Troubleshooting:
Marker detection with the web cam tends to be flaky in difficult lighting
conditions. Performance depends on overall brightness in the room,
color of walls and surroundings, etc. 

Some hints:
Print the marker with a good printer. The more contrast the printout has,
the more contrast it will have in the camera picture.

Glue the marker on some flat card. Ensuring that the marker is flat will
increase detection rates and accuracy.

Generally, create as much diffuse/ambient light as you can.
Light from above is better than from the side.
If you take this too far, the camera will get oversaturated, but
that is rather rare.

