Maybe I need to clarify little more here,
The theme of the project is "electric umpire", so the user will throw a ball to a surface,
and the system will be able to tell whether the ball is "safe" or "ball".
To do this, we are setting sensor near the surface, so we know when the ball hit the surface, the time that camera should
be detecting the position of the ball.
So as long as the camera captures that moment when the ball hit the surface, the image processing and all the other processes
doesn't really need to be in "real time", because we are not actually tracking the moving ball from the beginning to the end.
So much simplified description of this would be : ball thrown -> hit the surface -> camera activated to see where the ball hit-> sends
x,y position of the ball so that computer can say this is ball or safe.
This is the processor that I used for similar project. : Intel PXA270
http://www.phytec.com/pdf/datasheets/PXA270_DS.pdf
—32 KB instruction cache
—32 KB data cache
—2 KB “mini” data cache