Thank you very much, everyone! Now I have a rough picture of these two matters.
I will stick to selfcompiled stereovision (openCV on c++ should be easy enough)
As you might have concluded from the above statement, I plan on using a laptop as robo-brain (or something other that runs c++). Now, apart from the brain, a robot needs some wheels, a head, and at least one arm (if he is lucky). To connect PC decisions with wheels I obviously need a microcontroller - now a specific question:
I have these two PIC18F2550 microchips lying around from some previous usb project (yes, these PIC18F are USB able) - will I be able to use them as the connectionknot between USB and wheels? Has anyone some experience to share?