March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Novel Stereo Vision Test for Far Distances Measuring Perception Time as a Function of Disparity in a Virtual Environment
Author Affiliations & Notes
  • Jan H. Paulus
    Pattern Recognition Lab,
    Erlangen Graduate School in Advanced Optical Technologies (SAOT),
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Joachim Hornegger
    Pattern Recognition Lab,
    Erlangen Graduate School in Advanced Optical Technologies (SAOT),
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Michael Schmidt
    Erlangen Graduate School in Advanced Optical Technologies (SAOT),
    Chair of Photonic Technologies,
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Björn Eskofier
    Pattern Recognition Lab,
    Erlangen Graduate School in Advanced Optical Technologies (SAOT),
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Georg Michelson
    Erlangen Graduate School in Advanced Optical Technologies (SAOT),
    Department of Ophthalmology,
    University of Erlangen-Nuremberg, Erlangen, Germany
  • Footnotes
    Commercial Relationships  Jan H. Paulus, None; Joachim Hornegger, None; Michael Schmidt, None; Björn Eskofier, None; Georg Michelson, None
  • Footnotes
    Support  Erlangen Graduate School in Advanced Optical Technologies (SAOT), University of Erlangen-Nuremberg
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 1788. doi:
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      Jan H. Paulus, Joachim Hornegger, Michael Schmidt, Björn Eskofier, Georg Michelson; Novel Stereo Vision Test for Far Distances Measuring Perception Time as a Function of Disparity in a Virtual Environment. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1788.

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

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Abstract
 
Purpose:
 

To evaluate performance of stereo vision for far distances by measuring perception time as a function of disparity in a virtual environment.

 
Methods:
 

Our already presented stereo vision test was extended to evaluate far stereo vision in human subjects. The test setup consists of a polarized dual projection system for 3D simulation producing a virtual environment. To obtain lower disparities we use full HD projectors (1920 x 1080p). We included a depth sensor and developed an automated gesture detection to provide an intuitive and fast test control. We display four disks of the same size at the same disparity in arc seconds (’’). In each iteration one disk is randomly shown to be in front of the others by a certain disparity difference. The subject has to identify the front disk by pointing on it using our gesture control (see figure). The time to detect the correct disk was measured. In five iterations we showed the disparity differences 300’’, 225’’, 150’’, 75’’, and 15’’. This enables the evaluation of perception time as a function of decreasing disparity. We tested 10 healthy subjects (17-36 years) at a distance of six meters. We classified a given disparity to be perceptible by the subject, if the subject was able to identify the front disk at least four out of five times.

 
Results:
 

The average perception times for correct decisions varied from 1234 ms to 2951 ms in the range of 75’’-300’’ disparity and from 2358 ms to 3877 ms with the disparity of 15’’ (see diagram). In average the perception times decreased with increasing disparity and seemed to saturate in the range of 75’’-300’’. A clear gain of perception time is observable at 15’’. Two subjects were not able to detect the correct disk and were removed from the statistics.

 
Conclusions:
 

The presented test is a novel tool to analyze stereo vision in far distances by measuring perception time as a function of disparity using a virtual environment.  

 
Keywords: binocular vision/stereopsis • depth • clinical (human) or epidemiologic studies: systems/equipment/techniques 
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