help with visual processing.

i want to try my luck at visual processing . i got no idea how to start.
but i can tell this.
cameras will send the live image to a computer.
the processing will be done by the computer, and serial data will be sent to the arduino .

now.
i am just school-goer. but i would really like to start with visual processing.
could anyone just give me a start with it?
(my first project will be something like an obstacle avoiding robot using two side-by-side cameras)

could anyone just give me a start with it?

You could check the below.

http://www.roborealm.com/