Stereo vision uses two (or more) cameras in order, inter alia, to be able to detect the distance of objects using triangulation.
Defined on page 282
Used on Chap. 12: pages 282, 284, 285, 286; Chap. 15: page 361
Stereo vision -- each eye sees a slightly different view
Triangulation can be used to work out the object of focus of two cameras