July 2013
Volume 13, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   July 2013
An evaluation system for stereopsis of beach volleyball players measuring perception time as a function of disparity within a virtual environment
Author Affiliations
  • Jan Paulus
    Pattern Recognition Lab, University of Erlangen-Nuremberg\nInstitute of Photonic Technologies, University of Erlangen-Nuremberg
  • Joachim Hornegger
    Pattern Recognition Lab, University of Erlangen-Nuremberg\nErlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg
  • Michael Schmidt
    Institute of Photonic Technologies, University of Erlangen-Nuremberg\nErlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg
  • Bjoern Eskofier
    Pattern Recognition Lab, University of Erlangen-Nuremberg\nErlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg
  • Georg Michelson
    Department of Ophthalmology, University of Erlangen-Nuremberg\nErlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg
Journal of Vision July 2013, Vol.13, 1171. doi:10.1167/13.9.1171
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      Jan Paulus, Joachim Hornegger, Michael Schmidt, Bjoern Eskofier, Georg Michelson; An evaluation system for stereopsis of beach volleyball players measuring perception time as a function of disparity within a virtual environment. Journal of Vision 2013;13(9):1171. doi: 10.1167/13.9.1171.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: To present a system for performance evaluation of stereopsis for beach volleyball players. Methods: Our dynamic stimulus consists of four equally rendered spheres with volleyball textures each rotating around its x-axis presented on a polarized 32'' 3D-TV (1920x1080p) at a distance of 5 m. All spheres have the same crossed disparity of 15 arcsecs and are placed in front of a shining sun background with zero disparity. In each iteration one of the spheres is randomly chosen to have an enlarged disparity by a disparity difference. The subject’s task is to identify this sphere appearing closer as fast as possible by a button press while the detection time is automatically measured. Each disparity difference is evaluated in 16 iterations and classified as perceived with at least 10 correct decisions. Different lighting conditions are simulated by a lighting model enabling different intensities. In a preliminary example study we showed three disparity differences: 15, 45, and 75 arcsecs. They were presented in randomized order in two sessions. In session one light was set to highest intensity, in session two it was dimmed on the spheres. We measured 9 subjects with an age of 29.3 ± 2.3 years. Results: All subjects were able to perceive all stimuli except for two subjects under dimmed light conditions at the lowest disparity difference. The medians of the detection times vary between 892 and 3415 ms under full light conditions and between 958 and 4135 ms under dimmed light conditions. In both cases detection times increase for decreasing disparity differences and thus increasing difficulty. For dimmed conditions the detection times decrease compared to full light conditions where the differences vary between 1 and 1818 ms. Conclusion: We presented an evaluation system that reliably measures performance of stereopsis for beach volleyball players under simulated configurable realistic conditions.

Meeting abstract presented at VSS 2013

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