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Improving visual comfort in stereo-3d

All stereo-3d-displays of today induce the so called accomodation-vergence-conflict (AVC). It is a decoupling between two oculomotor mechanisms that are usually coupled: Adjustman of focal length (accomodation) and vergence movements of the eyes. The problem occurs because a viewer has to accomodate to the stereo-3d display distance but converge his eyes on a 3d-stimulus in front of or behind the display. The conflict is tolerable to certain degrees but big discrepancies are known to be one of the main sources for visual fatigue.

In order to improve the visual comfort we propose a new active stereo-3d processing method and study its implications. This basic idea is to shift the point currently gazed upon (visual focus) slowly into the display plane where the conflict doesn't exist. This is done via horizontal shifts of the stereo views, which are known to be not perceivable when the shifting speed is low. The visual focus is estimated through a videobased gaze tracking system. The shifting amplitude is retrieved from à priori disparity maps or a realtime disparity estimation. The depth of the presented scene gets distorted by the shifts. However, a viewport interpolation can be used to eliminate this distortion. In addition to the "convergence shifts", the system will be extended by gaze-adaptive depth of field reduction and viewer induced motion parallax, in order to improve visual comfort even further. These extensions are possible due to the fact that eye- and gazetracking is already in place.

The effects of our proposed method on the human visual system are studied in the course of extensive subjective evaluations. We hope to learn new things about the human depth perception and will formulate appropriate recommendations for stereo-3d production.

AKD und Algorithmusprinzip

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M.Sc. Christian Brauers