Rear-screen and kinesthetic vision 3D manipulator

Abstract

Background: The effective 3D manipulation, comprehension, and control of 3D objects on computers are well-established lasting problems, which include a display aspect, a control aspect, and a spatial coupling between control input and visual output aspect, which is a debatable issue. Most existing control interfaces are located in front of the display. This requires users to imagine that manipulated objects that are actually behind the display exist in front of the display. Methods: In this research, a Rear-Screen and Kinesthetic Vision 3D Manipulator is proposed for manipulating models on laptops. In contrast to the front-screen setup of a motion controller, it tracks a user’s hand motion behind screens, coupling the actual interactive space with the perceived visual space. In addition, Kinesthetic Vision provides a dynamic perspective of objects according to a user’s sight, by tracking the position of their head, in order to obtain depth perception using the “motion parallax” effect. Results: To evaluate the performance of “rear-screen interaction” and Kinesthetic Vision, an experiment was conducted to compare the front-screen setup, the rear-screen setup with Kinesthetic Vision, and the rear-screen setup without it. Subjects were asked to grasp and move a cube from a fixed starting location to a target location in each trial. There were 20 designated target locations scattered in the interactive space. The moving time and distance were recorded during experiments. In each setup, subjects were asked to go through five trial blocks, including 20 trials in each block. The results show that there are significant differences in the moving efficiency by repeated measures ANOVA. Conclusion: The Rear-Screen and Kinesthetic Vision setup gives rise to better performance, especially in the depth direction of movements, where path length is reduced by 24%.