A new interactive virtual showcase is proposed in this paper. With the help of virtual reality technology, the user of the
proposed system can watch the virtual objects floating in the air from all four sides and interact with the virtual objects
by touching the four surfaces of the virtual showcase. Unlike traditional multitouch system, this system cannot only
realize multi-touch on a plane to implement 2D translation, 2D scaling, and 2D rotation of the objects; it can also realize
the 3D interaction of the virtual objects by recognizing and analyzing the multi-touch that can be simultaneously
captured from the four planes. Experimental results show the potential of the proposed system to be applied in the
exhibition of historical relics and other precious goods.
Background subtraction technique has been widely used in the single camera based multi-touch system. The solution
based on fixed-rate background accumulation can only be used to the applications with gradual change of ambient
lightings. This paper presents a solution to update background by detecting ambient lightings, which enables the
multi-touch system to be operated under the conditions of rapid or complicated change of ambient lightings.
Experimental results show that with the help of the presented solutions, the ghost points are efficiently reduced and the
system can adapt to the changes of ambient lighting in 1 second.