Egocentric distance estimation on a discontinuous ground surface in the virtual environment

2014 ◽  
Author(s):  
Elena Shemetova ◽  
Bobby Bodenheimer
Keyword(s):  
Virtual Environment ◽  
Ground Surface ◽  
Distance Estimation ◽  
Egocentric Distance

scholarly journals Visual Distance Estimation in Static Compared to Moving Virtual Scenes

2006 ◽  
Vol 9 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Harald Frenz ◽  
Markus Lappe
Keyword(s):  
Virtual Environment ◽  
Visual Motion ◽  
Human Subjects ◽  
Distance Estimation ◽  
Visual Space ◽  
Depth Interval ◽  
Natural Scenes ◽  
Virtual Scene ◽  
Visual Distance ◽  
Control Direction

Visual motion is used to control direction and speed of self-motion and time-to-contact with an obstacle. In earlier work, we found that human subjects can discriminate between the distances of different visually simulated self-motions in a virtual scene. Distance indication in terms of an exocentric interval adjustment task, however, revealed linear correlation between perceived and indicated distances but with a profound distance underestimation. One possible explanation for this underestimation is the perception of visual space in virtual environments. Humans perceive visual space in natural scenes as curved, and distances are increasingly underestimated with increasing distance from the observer. Such spatial compression may also exist in our virtual environment. We therefore surveyed perceived visual space in a static virtual scene. We asked observers to compare two horizontal depth intervals, similar to experiments performed in natural space. Subjects had to indicate the size of one depth interval relative to a second interval. Our observers perceived visual space in the virtual environment as compressed, similar to the perception found in natural scenes. However, the nonlinear depth function we found can not explain the observed distance underestimation of visual simulated self-motions in the same environment.

Effect of total sleep deprivation on egocentric distance estimation following a fatiguing task

2014 ◽  
Vol 46 (2) ◽  
pp. 265-274 ◽  
Author(s):  
Hamza Baati ◽  
Moufida Shell Hmani ◽  
Mohamed Jarraya ◽  
Hamdi Chtourou ◽  
Liwa Masmoudi ◽  
...  
Keyword(s):  
Sleep Deprivation ◽  
Distance Estimation ◽  
Egocentric Distance ◽  
Total Sleep Deprivation

scholarly journals Obstacles Affect Perceptions of Egocentric Distances in Virtual Environments

2021 ◽  
Vol 2 ◽  
Author(s):  
Daisuke Mine ◽  
Sakurako Kimoto ◽  
Kazuhiko Yokosawa
Keyword(s):  
Virtual Environments ◽  
Distance Perception ◽  
Distance Estimation ◽  
Egocentric Distance ◽  
Intermediate Space ◽  
Action Capability ◽  
Specific Effects ◽  
Transparent Barrier

Distance perception in humans can be affected by oculomotor and optical cues and a person’s action capability in a given environment, known as action-specific effects. For example, a previous study has demonstrated that egocentric distance estimation to a target is affected by the width of a transparent barrier placed in the intermediate space between a participant and a target. However, the characteristics of a barrier’s width that affect distance perception remain unknown. Therefore, we investigated whether visual and tactile inputs and actions related to a barrier affect distance estimation to a target behind the barrier. The results confirmed previous studies by demonstrating that visual and tactile presentations of the barrier’s width affected distance estimation to the target. However, this effect of the barrier’s width was not observed when the barrier was touchable but invisible nor when the barrier was visible but penetrable. These findings indicate the complexity of action-specific effects and the difficulty of identifying necessary information for inducing these effects.

scholarly journals Egocentric distance estimation requires eye-head position signals

2010 ◽  
Vol 6 (6) ◽  
pp. 734-734
Author(s):  
G. Blohm ◽  
J. D. Crawford
Keyword(s):  
Distance Estimation ◽  
Head Position ◽  
Egocentric Distance

The Perception and Estimation of Egocentric Distance in Real and Augmented Reality Environments

2005 ◽  
Vol 49 (26) ◽  
pp. 2249-2252 ◽  
Author(s):  
Christian Jerome ◽  
Bob Witmer
Keyword(s):  
Numerical Estimate ◽  
Distance Estimation ◽  
Distance Judgment ◽  
Egocentric Distance ◽  
Replication Method ◽  
Object Distance ◽  
Judgment Error ◽  
Verbal Estimation ◽  
Environment Type ◽  
Replication Procedure

The perception of distance to real and virtual objects using two methods of distance estimation (verbal estimation and manual replication) along a 110 foot hallway was tested. Results suggest that verbal estimates of distance may not accurately reflect perceived distances. Replication procedure significantly improves the estimation of the previously viewed object distance. Furthermore, the effects of distance judgment method were greater than were the effects of environment type. The magnitude of the distance judgment error was considerably larger for the estimation condition in the real environment than it was for the replication condition in the augmented environment. These results lend further support to the notion that verbal estimates of distance do not accurately represent perceived distance. Unless the task being performed specifically requires a numerical estimate of distance, it is recommended that methods similar to our distance replication method be used to accurately determine perceived distance.

Inaccurate Space Perception Seeing Through Fences

Perception ◽  
2020 ◽  
Vol 49 (9) ◽  
pp. 926-939
Author(s):  
Bo Dong ◽  
Airui Chen ◽  
Yuting Zhang ◽  
Changchun Li ◽  
Tianyang Zhang ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Visual Angle ◽  
Daily Life ◽  
Ground Surface ◽  
Space Perception ◽  
Vital Role ◽  
Target Size ◽  
Integration Process ◽  
Egocentric Distance ◽  
Surface Integration

According to the sequential surface integration process hypothesis, the fine near-ground-surface representation and the homogeneous ground surface play a vital role in the representation of the ground surface. When an occluding box or opaque wall is placed between observers and targets, observers underestimate egocentric distance. However, in our daily life, many obstacles are perforated and cover the ground surface and targets simultaneously (e.g., fences). Humans see and observe through fences. The images of these fences and targets, projected onto observers’ retinas, overlap each other. This study aims to explore the effects of perforated obstacles (i.e., fences) on space perception. The results showed that observers underestimated the egocentric distances when there was a fence on the ground surface relative to the no-fence condition, and the effect of widely spaced thick wood fences was larger than that of narrowly spaced thin iron fences. We further demonstrated that this effect was quite robust when the target size had a visual angle of 1°, 2°, or 4° in three virtual reality experiments. This study may add support for the notion that the sequential surface integration process hypothesis is applicable even if the obstacle is perforated and covers the target.

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