Robert S Allison | York University (original) (raw)
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Papers by Robert S Allison
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Experimental brain research, 2018
We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulu... more We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulus motion was modulated by varying the number of frames comprising the movement. In this study, a horizontal grating translated through 360° of phase in 1 s divided into steps of 3, 4, 6, 12, 20, 30, or 60 frames. We hypothesized that smoother motion should induce stronger vection because the smoother stimulus is more natural and contains more motion energy. We examined this effect of frame number on vection for both downward (Experiment 1) and expanding (Experiment 2) optical flow. The results clearly showed that vection strength increased with increasing frame rate, however, the rates of increase in the vection strength with frame rate are not constant, but rapidly increase in the low frame-rate range and appear to asymptote in the high range. The strength estimates saturated at lower frame rates for expanding flow than for downward flow. This might be related to the fact that to proces...
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Journal of Imaging Science and Technology
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Perception Ecvp Abstract, 2014
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Directional data arising from psychophysical studies requires careful processing due to its cycli... more Directional data arising from psychophysical studies requires careful processing due to its cyclical nature. Unlike linear variables such as response time and intensity, directions can be represented as angles or vectors on a circle, may have no natural zero-point or magnitude, and are defined on a periodic circle rather than an infinite line. Because of these unique features, directional data necessitates the use of circular statistical methods; however, unfamiliarity and limited availability of software that support circular data analysis have largely led to its under-use and misapplication. Here the implications of using linear statistics for circular data were explored by submitting data from a behavioural study to both circular and linear statistical analysis.
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Proceedings of the 2004 ACM SIGGRAPH international conference on Virtual Reality continuum and its applications in industry - VRCAI '04, 2004
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Display Technology Journal of, Apr 1, 2012
The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objecti... more The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objectionable in laser projectors compared to conventional digital projectors was investigated. Untrained observers viewed movie clips in a theater and made image quality ratings. The same four clips were presented on both a standard Xenon display and a prototype laser projector in separate blocks. There was no evidence that observers noticed color break-up artefacts using either mode of presentation.
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Proceedings of the Workshop on Virtual Environments 2003, May 22, 2003
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J Vision, 2010
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F1000posters, Sep 13, 2011
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Proceedings of Spie the International Society For Optical Engineering, May 1, 2004
The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allis... more The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allison. Abstract. Convergence of the real or virtual stereoscopic cameras is an important operation in stereoscopic display systems. ...
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Experimental brain research, 2018
We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulu... more We examined the effect of the smoothness of motion on vection strength. The smoothness of stimulus motion was modulated by varying the number of frames comprising the movement. In this study, a horizontal grating translated through 360° of phase in 1 s divided into steps of 3, 4, 6, 12, 20, 30, or 60 frames. We hypothesized that smoother motion should induce stronger vection because the smoother stimulus is more natural and contains more motion energy. We examined this effect of frame number on vection for both downward (Experiment 1) and expanding (Experiment 2) optical flow. The results clearly showed that vection strength increased with increasing frame rate, however, the rates of increase in the vection strength with frame rate are not constant, but rapidly increase in the low frame-rate range and appear to asymptote in the high range. The strength estimates saturated at lower frame rates for expanding flow than for downward flow. This might be related to the fact that to proces...
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Journal of Imaging Science and Technology
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Perception Ecvp Abstract, 2014
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Directional data arising from psychophysical studies requires careful processing due to its cycli... more Directional data arising from psychophysical studies requires careful processing due to its cyclical nature. Unlike linear variables such as response time and intensity, directions can be represented as angles or vectors on a circle, may have no natural zero-point or magnitude, and are defined on a periodic circle rather than an infinite line. Because of these unique features, directional data necessitates the use of circular statistical methods; however, unfamiliarity and limited availability of software that support circular data analysis have largely led to its under-use and misapplication. Here the implications of using linear statistics for circular data were explored by submitting data from a behavioural study to both circular and linear statistical analysis.
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Proceedings of the 2004 ACM SIGGRAPH international conference on Virtual Reality continuum and its applications in industry - VRCAI '04, 2004
Bookmarks Related papers MentionsView impact
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Display Technology Journal of, Apr 1, 2012
The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objecti... more The hypothesis that artefacts related to chromatic aberration from eyeglasses may be more objectionable in laser projectors compared to conventional digital projectors was investigated. Untrained observers viewed movie clips in a theater and made image quality ratings. The same four clips were presented on both a standard Xenon display and a prototype laser projector in separate blocks. There was no evidence that observers noticed color break-up artefacts using either mode of presentation.
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Proceedings of the Workshop on Virtual Environments 2003, May 22, 2003
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J Vision, 2010
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F1000posters, Sep 13, 2011
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Proceedings of Spie the International Society For Optical Engineering, May 1, 2004
The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allis... more The camera convergence problem revisited. [Proceedings of SPIE 5291, 167 (2004)]. Robert S. Allison. Abstract. Convergence of the real or virtual stereoscopic cameras is an important operation in stereoscopic display systems. ...
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