Simulating and displaying of puck motion in virtual air hockey based on projective interface

This paper shows the simulating and displaying of Puck motion in virtual Air Hockey based on projective interface for multi-users HRI Image-projective Desktop Arm Trainer (IDAT) is an upper-limb rehabilitation system for hand-eye coordination training based on projective interface. To expand more entertainment functions and realize multi-user HRI, we want to develop a virtual Air Hockey application in IDAT. To develop this application, Puck motion should be simulated correctly and displayed smoothly on the screen. There are mainly 3 problems: Data updating rate problem, virtual collision calculation and individual´s hand misrecognition problem. We proposed our method into three parts corresponding to different problems. In part 1, we used multiple timers with shared memory to deal with unsynchronized data updating rate problem. In part 2, an original physical engine is designed to calculate Puck´s velocity and detect virtual collision. In part 3, to deal with the individual´s hand misrecognition problem, a history-based hand owner recognition algorithm is implemented to distinguish users´ hands.