Patent ID: 8749502

Claim:
A method for virtual touch sensing, comprising steps of: a) detecting coordinates of an indicator in a virtual sensing space by using more than one sensors; and b) calculating corresponding screen coordinates on a screen according to said coordinates of said indicator; wherein an operation plane in said virtual sensing space having an area independent to that of said screen; wherein said sensors further comprise a first camera and a second camera; said first camera being substantially located at a first edge corner of said display and said second camera being substantially located at a second edge corner of said display; a location of said indicator in a 2-dimensional image of said first camera being P L (x l , y l ); a location of said indicator in a 2-dimensional image of said second camera being P R (x r , y r ); a 3-dimensional coordinate P(x, y, z) of said indicator in said virtual sensing space being calculated using the following equations: x=b ( x l +x r )/[2( x l −x r )] y=b ( y l +y r )/[2( y l −y r )] z=bf /( x l −x r ) wherein b is a straight line distance between said first camera and said second camera, and f is a focal length of said first camera and said second camera.