[JakeC]

Quote:
The camera's hardware is only capable of tracking one target at a time. But if there are two targets in its field of view, it will perform the equivalent of drawing a "box" around both of the targets and tracking the center of that "box". The robot can determine the number of targets it is tracking based on the size of that "box."

Basically, you can tell how many targets there is by the number of pixels your camera counts, distance also affects this factor.