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Proceedings Paper

Generating Images For A Time-Multiplexed Stereoscopic Computer Graphics System
Author(s): John Baker
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Paper Abstract

Stereoscopic images provide unique visual information not available in the planar computer-graphics images which have come to be called "3-D." However, special care must be taken in generating stereoscopic pairs of images for computer graphics. The creation of stereoscopic images requires observing special constraints which do not occur in generating planar "3-D" graphics, in order to produce three-dimensional images which are not distorted, are comfortable to view for long periods, and which appear to have appropriate z-axis depth. The interrelated stereoscopic factors of convergence, accommodation, homologous points, retinal disparity, and binocular symmetry are explained. The effects on the stereoscopic CRT image of positive, negative, zero, and uncrossed parallax values are described, and various special problems and solutions related to images with negative parallax are discussed. Limitations prescribed by the accommodation/convergence ratio and by the use of off-screen effects are proposed. Procedures are offered to writers of software for the creation of properly-prepared images for display on a flickerless time-multiplexed stereoscopic CRT display system, with consideration given to extrastereoscopic cues, screen geometry, and initialization parameters. A useful stereoscopic camera model is described, in which the mapping of points in world coordinates is designated, along with parallax governors to prevent the display of discomfort-producing images. Algorithms are given for the generation of images in the correct format for the system described.

Paper Details

Date Published: 16 June 1987
PDF: 9 pages
Proc. SPIE 0761, True Three-Dimensional Imaging Techniques & Display Technologies, (16 June 1987); doi: 10.1117/12.940119
Show Author Affiliations
John Baker, StereoGraphics Corp. (United States)

Published in SPIE Proceedings Vol. 0761:
True Three-Dimensional Imaging Techniques & Display Technologies
David F. McAllister; Woodrow E. Robbins, Editor(s)

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