Transparent tabletop interface for multiple users on Lumisight table

This paper presents a new type of tabletop interface on Lumisight table. Putting physical objects on a tabletop display is one of the typical methods for intuitive tangible input. To date, various interactive systems that can identify and track the tabletop objects by using a camera, have been proposed. However, in these systems, the existence of objects with special devices or markers can disturb users´ natural interaction by hiding displayed information. To solve this problem, the authors propose a transparent tabletop interface that is transparent from users but visible from a camera installed inside the system. This paper describes our research motivation, design and implementation of this interface, and examples of interaction.