Week 6 Summary
In this paper, the authors concentrate on the importance of depth perception. By reviewing the previous work in this area, they introduces the concepts of stereoscopic disparity and motion parallax. A lot of insights and interesting findings are collected here to help readers have a better understanding of these concepts. They also give an introduction to perspective distortion, active touch and fish-tank VR. The importance of tracking head position and sense of touch is stressed.
The main work they do in this paper is to evaluate correct perspective and stereoscopic depth for tapping task. Their experiment is carried out by performing a task, which is a variation of Fitts’ experiment. They ask subjects to tap several targets in series and look at the time course of the intertap intervals, in order to find out how fast subjects can adapt to head rotation. After determine the independent variables in the experiment, they ask each subject to take 12 trials and take note of time they use between each two trials. By analyzing the data, they come to several conclusions:
1. stereoscopic viewing is more important than eye-coupled perspective.
2. the value of depth cues will also depend on the tasks.
3. head tracking has an effect on subjects’ performance.
4. accurate coregistration of eye-and-hand coordinate spaces is not necessary for fish-tank AR.
Question to author：How do you design the position of each cylinder in order to guarantee that the subject with rotate their head between each two trials?
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