Optical touch screen with virtual force

This paper presents a novel approach of using stereovision or pseudo-stereovision to generate touch screen experience. A pair of digital cameras or a set of a digital camera and a mirror is mounted at the corners of a computer display. Algorithms are presented to generate the positions of the pointers when they are close to the screen. The paper also proposes to use positions, velocities and accelerations of a pointer to generate virtual forces in the active space of the touch screen. The user interface will be friendlier by applying the rich information obtained from the input methods presented in this paper.