Parallax

Source: https://en.wikipedia.org/wiki/Parallax
See also: motion parallax

Definition: The difference in the apparent position of an object viewed from two different positions

• This difference is given by the angle between the two lines of sight
• Binocular vision uses parallax in the overlapping fields of vision in order to gain depth perception
• Distance measurement (i.e. depth from the viewer) via parallax is based on the principle of triangulation (uses trigonometry, s. Monocular depth perception in humans )