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.]


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.


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).


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.


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.



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