You can record the stream from your axis camera on your drive laptop using VLC. See the documentation here:
https://wiki.videolan.org/Documentat..._using_the_GUI
Then you can look at the recorded file and save relevant images from it.
There are also sample tower images taken with a green led ring that were released shortly after kickoff (located somewhere on usfirst.collab.net). You can use these to develop your vision if you also use a green led ring. It includes tower lights, so you can make sure you filter those out.
We prevented tower lights from interfering with vision by filtering out small particles (in NI vision - I'm sure grip and plain OpenCV allow something similar)