That is, the laser pointer is made of it by the selected area will be brought to the histogram to the histogram is used to track a point on the movement.
That is, point Laser pointer is created from the selected area will be exerted to find a histogram to the histogram values in the track points when there is motion.
The point is that it was created by the pointer from Laser is selected will be used to find the histogram histogram to bring this point to the track when the access point is the motion