I wanted my robot to be able to track object and follow them. The first thing I wanted to do is give the robot the ability to follow an object with its head camera. The head camera is mounted on a pan-tilt servo system, and hence is capable of moving left and right, up and down (as seen in the picture below).
My second object tracking goal was to make the robot chase after an object, much like a dog would chase a ball thrown by his owner. This kind of tracking is quite harder – it would use the head camera tracking from the previous step, and combine it with rest of the robot sensors to follow the object.