Mr. Sunil Pala Profile

Sunil Pala

Research Scientist at National Physical Lab

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Proceedings Article | 5 March 2007 Paper

Optical cross-talk and visual comfort of a stereoscopic display used in a real-time application

S. Pala, R. Stevens, P. Surman

Proceedings Volume 6490, 649011 (2007) https://doi.org/10.1117/12.703134

KEYWORDS: Cameras, LCDs, 3D image processing, Visualization, Video, Visual optics, Mirrors, Stereoscopic displays, 3D metrology, Eye

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Many 3D systems work by presenting to the observer stereoscopic pairs of images that are combined to give the impression of a 3D image. Discomfort experienced when viewing for extended periods may be due to several factors, including the presence of optical crosstalk between the stereo image channels. In this paper we use two video cameras and two LCD panels viewed via a Helmholtz arrangement of mirrors, to display a stereoscopic image inherently free of crosstalk. Simple depth discrimination tasks are performed whilst viewing the 3D image and controlled amounts of image crosstalk are introduced by electronically mixing the video signals. Error monitoring and skin conductance are used as measures of workload as well as traditional subjective questionnaires. We report qualitative measurements of user workload under a variety of viewing conditions. This pilot study revealed a decrease in task performance and increased workload as crosstalk was increased. The observations will assist in the design of further trials planned to be conducted in a medical environment.

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