A colleague of mine did the following demo:
http://www.youtube.com/watch?v=PbMH5FBVbl4
Here is the original posting:
http://www.pouet.net/user.php?who=3857
It's all handcoded assembly. An integrated video player does a realtime algorithm for finding straight lines, each frame. The 3D-modelled car is also "real" 3D, with a viewport.