The Importance of Stereo and Eye-Coupled Perspective for Eye-Hand Coordination in Fish Tank VR

The Importance of Stereo and Eye-Coupled Perspective for Eye-Hand Coordination in Fish Tank VR

Stereoscopic depth is all about the information gain from disparities. In opposite, Motion Parallax refers to the depth information obtains when an observer is moving in the environment. If both seem important for virtual environment, studies failed to determine which one is the most important for an user in VE. This study focuses on the impact of correct and incorrect perspective and stereoscopic depth. It is based on a Fish Tank VR which provides a small field of view on a high resolution monitor. This hardware achieves to display a reasonable quality of stereoscopic depth. Tracking the head also permits to render the motion parallax.
The test used for this paper is quit simple. Subjects have to tap at the top of different cylinders. Each subjects has to wear stereo glasses and a head tracking position device. The scene is rendered through a mirror and the subject has to look into it to view his action. Subjects also have a force feedback device to render material’s property they touch. This configuration allows researchers to independently activate or deactivate head tracking and stereoscopic depth. The result of this study is based on the time between each tap. Without head-tracking, it is 11% longer while without stereo, it is 33% larger. The overall gain obtained by adding both head-tracking (motion parallax) and stereoscopic depth is about 1.1 bit of information per second. And authors estimate that more than 50% of this increase is linked to stereoscopic depth.

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