1. An imaging assembly comprising: a substantially rectangular frame configured to surround a region of interest; at least two active pixel digital cameras, each digital camera being mounted adjacent a different corner of said frame, each digital camera having a field of view that (i) images at least a portion of the region of interest, and (ii) images at least a portion of the frame, said digital cameras being oriented to capture overlapping images of said region of interest, at least one of said at least two digital cameras having a sensor comprising a plurality of pixels extending in at least one direction; and at least one processor receiving the images from each digital camera, and determining therefrom an absolute position of an object of interest in said region of interest, wherein said at least one processor comprises: first processing structure processing an image from at least one digital camera, said first processing structure highlighting at least one pointer in said image from the at least one digital camera; and second processing structure determining the location of said highlighted pointer in said image.