In this paper, we introduce another algorithm to do it, which USES an automatically exposed video sequence gathered at a fixed observing point.

Astronomers got information about the planet by observing its effect on its star's light when it moved in front of the star from our point of view.

Even if the person may be at his/her wits-end handling the individual, just observing from a third party's point of view can give you insights on how to manage.