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Proceedings Paper

Doing it with mirrors: low-budget stereographics
Author(s): Allen Van Gelder; Jane Wilhelms
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Paper Abstract

Interactive stereoscopic images can be viewed on a graphics workstation by producing side-by-side images and viewing through a simple mirror device. However, it is important that the viewing device have pairs of adjustable nonparallel mirrors so large windows can be viewed without the human's sightlines needing to diverge, or 'look wall-eyed'. Transformations to produce the correct images for this viewing method are described. Previous work applied to the case where both left and right images were to be superimposed and multiplexed in the same region of the screen, often called anaglyphs. Such cases are adequately handled by a translation and an off-axis perspective transformation. The same kind of transformation can be used with a parallel-mirror device, but such devices have practical limitations. This paper shows that nonparallel mirrors require a somewhat more complicated transformation involving scene rotations as well. Derivation of the correct angle of rotation of the main difficulty in computing this transformation. The transformation can be implemented by a sequence of graphics library procedures. Advantages and disadvantages of nonparallel mirror methods are discussed.

Paper Details

Date Published: 4 April 1994
PDF: 10 pages
Proc. SPIE 2178, Visual Data Exploration and Analysis, (4 April 1994); doi: 10.1117/12.172078
Show Author Affiliations
Allen Van Gelder, Univ. of California/Santa Cruz (United States)
Jane Wilhelms, Univ. of California/Santa Cruz (United States)

Published in SPIE Proceedings Vol. 2178:
Visual Data Exploration and Analysis
Robert J. Moorhead II; Deborah E. Silver; Samuel P. Uselton, Editor(s)

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