International Stereoscopic Union















 

A Glossary of Stereoscopic Terms

tautomorphic image (adv.)

A stereoscopic image which presents the original scene to the viewer exactly as it would have been perceived in life; ie, with the same apparent scale, positions of scenic elements, and a stereo magnification of x1 for all subject matter in the view.

Taxiphote viewer

A form of cabinet viewer devised by the Jules Richard company for viewing a collection of stereograms in sequence, and continuously.

three-dimensional (or 3-D)

A modern-usage alternative to the term stereoscopic, derived from Descartes' system of coordinates which assigns two dimensions to a plane (usually denoted x and y) and three dimensions (x, y and z) to a solid space. [Note: The term '3-D' has been misappropriated by the computer industry to denote the process of on-screen perspective modelling with a depth coordinate but in a single plane - pseudo 3-D.]

tissue

In stereo usage, an early type of stereogram on translucent paper in a card frame, often tinted and sometimes with pin-pricked highlights designed for viewing with backlighting.

toeing-in

The technique of causing the optical axes of twin planar cameras to converge at a distance point equivalent to that of a desired stereo window, so that the borders of the images are coincident at that distance (apart from any keystoning which results).

transposition

The changing over of the inverted images produced by a stereo camera to the upright and left/right presentation necessary for normal viewing. May be achieved optically by means of a transposing camera or viewer, or mechanically by means of a special printing frame, as well as manually during the mounting of images.

Tru-Vue

Proprietary name of a commercial stereo transparency viewing system which presents a series of views in a film-strip sequence on a single card mount.

twist (coll.)

Rotational displacement of one view in a stereo pair in relation to the other.

 


   

International Stereoscopic Union
8008 Zurich
Switzerland

Phone: +41 (44) 508 1024
e-mail: ISU@stereoscopy.com

 

© COPYRIGHT 1997 - ALL RIGHTS RESERVED INTERNATIONAL STEREOSCOPIC UNION