Objective. Neurophysiological correlates of vertical disparity in 3D images are studied in an objective approach using EEG technique. These disparities are known to negatively affect the quality of experience and to cause visual discomfort in stereoscopic visualizations. Approach. We have presented four conditions to subjects: one in 2D and three conditions in 3D, one without vertical disparity and two with different vertical disparity levels. Event related potentials (ERPs) are measured for each condition and the differences between ERP components are studied. Analysis is also performed on the induced potentials in the time frequency domain. Main results. Results show that there is a significant increase in the amplitude of P1 components in 3D conditions in comparison to 2D. These results are consistent with previous studies which have shown that P1 amplitude increases due to the depth perception in 3D compared to 2D. However the amplitude is significantly smaller for maximum vertical disparity (3D-3) in comparison to 3D with no vertical disparity. Our results therefore suggest that the vertical disparity in 3D-3 condition decreases the perception of depth compared to other 3D conditions and the amplitude of P1 component can be used as a discriminative feature. Significance. The results show that the P1 component increases in amplitude due to the depth perception in the 3D stimuli compared to the 2D stimulus. On the other hand the vertical disparity in the stereoscopic images is studied here. We suggest that the amplitude of P1 component is modulated with this parameter and decreases due to the decrease in the perception of depth.
Bibliographical noteFunding Information:
The authors would like to acknowledge Dr Matthias S Treder for his useful comments during this study. This research was partially funded by the German Research Foundation (DFG, SFB938/Z3 and TRR-169/B4). Klaus-Robert Mueller thanks DFG (DFG SPP 1527, MU 987/14-1) and the Federal Ministry for Education and Research (BMBF) as well as by the Brain Korea 21 Plus Program funded by the Korean government. Correspondence to WS, GC, TW and KRM.
© 2017 IOP Publishing Ltd.
- EEG analysis
- objective assessment
- quality of experience
- stereoscopic images
- vertical disparity
ASJC Scopus subject areas
- Biomedical Engineering
- Cellular and Molecular Neuroscience