week 6 summary [Aurelien Bonnafont]
This paper explain how produce a VR environment with an accurate vision of depth and compare head tracking and Stereoscopic vision in the case of visually guided task.
Stereopsis allows us to compute the distance of objects to the user, and this technique is useful with a high resolution screen.
Motion parallax is the depth information when the observer moves. It is good for near view but not useful for far condition.
Studies have proven than parallax is more accurate than stereopsis for tracing path in a network or tree structures but stereopsis seems to be more useful for visually guided reaching.
A head tracking system is often utilized to keep eye in the perspective center and active touch is also important to recalibrate the position of an object during visually guided reaching.
The study provided has for goal to measure the effect of correct and incorrect perspective. A subject taps a series of cylinder with a phantom stylus and Fit’s law is used to compute the performance. To make sure the subject move is head an artificial barrier is placed.
The result of this experience shows that both head tracking and stereoscopic reduce the average time per tap as difficulty increase, but stereoscopic vision seems to be more important. We can conclude that stereoscopic vision is more important than a correct perspective center in the case of visually guided reaching.
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