An interactive input system includes at least one imaging device having a field of view looking into a region of interest and capturing images; at least one pen tool comprising an accelerometer configured to measure acceleration of the pen tool and to generate acceleration data, the pen tool configured to wirelessly transmit the acceleration data; and processing structure configured to process the images and acceleration data to determine the location of at least one pointer in the region of interest.
MULTI-POINTER DISAMBIGUATION BY COMBINING IMAGE AND ACCELERATION DATA