a pair of flat perspective images of the same object obtained from different points of view. When a stereopair is viewed in such a way that each eye sees only one of the images, a three-dimensional (stereoscopic) picture giving a sensation of depth is perceived. Stereopairs are used to create three-dimensional images of objects in stereoscopic motion-pictures, stereo-photography, and stereoscopic television; they are also used for scientific purposes.
Stereopairs are obtained with stereoscopic cameras, both still and motion-picture, with two television camera tubes, or with special attachments for the lenses of conventional still and motion-picture cameras. In addition, various instruments are used to obtain and study stereopairs in stereophotogrammetric surveying.
L. A. RIVKIN