Mr. Robert H. Black Profile

Robert H. Black

at Univ of Liverpool

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Proceedings Article | 6 March 2014 Paper

The effect of stereoscopic acquisition parameters on both distortion and comfort

Robert Black, Sophie Wuerger, Georg Meyer

Proceedings Volume 9011, 90110U (2014) https://doi.org/10.1117/12.2039939

KEYWORDS: Cameras, Distortion, 3D image processing, Ray tracing, Eye, 3D acquisition, 3D vision, Data modeling, Eye models, Tolerancing

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The purpose of our experiments was to investigate the effect of interaxial camera separation on the perceived shape and viewing comfort of 3D images. Horizontal Image Translation (HIT) and interaxial distance were altered together. Following Banks et al (2009), our stimuli were simple stereoscopic hinges and we measured the perceived angle as a function of camera separation. We compared the predictions based on ray tracing with the perceived 3D shape obtained psychophysically. 40 participants were asked to judge the angles of 250 hinges at different camera separations (interaxial and HIT linked a 20-100mm; angle range: 50°-130°). Comfort data was obtained using a five point Likert scale. Stimuli were presented in orthoscopic conditions with screen and observer Field of View (FOVO) matched at 45°. Our main results are: (1) For the 60mm camera separation, observers perceived a right angle correctly, but at other camera separations right angles were perceived as larger than 90° (camera separations > 60mm) or smaller than 90° (camera separations < 60 mm). (2) The observed perceptual deviations from a right angle were smaller than predicted based on disparity information (ray tracing model) alone. (3) We found an interaction between comfort and camera separation: only at the 60mm camera separation (e.g. at typical human eye separation) do we find a significant negative correlation between angle and comfort. All other camera separations, the disparity (angle) has no systematic effect on comfort. This research is set out to provide a foundation for tolerance limits for comfort and perceptual distortions brought about by various virtual camera separations.

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