Patent ID: 8041389
Filing Date: 2011-10-18
Classification: H04M

Abstract:
1. A cellular telephone device having an integrated camera unit, comprising: a source of illumination positioned adjacent said camera unit and configured to illuminate a portion of an underlying surface within the field of view the camera unit when said telephone is placed upon said surface; programming effective to (a) collect a current tracking image frame, (b) compare said current tracking image frame with a prior tracking image frame, (c) compute a relative displacement between said tracking image frames, and (d) store said current tracking image frame as a prior tracking image frame; a wireless peripheral interface, wherein said wireless peripheral interface communicates said relative displacement to a computer for use in manipulating a command element; and an image sensor having a plurality of types of photosites, the plurality of types of photosites for collecting image data from a plurality of stored tracking image frames; wherein said source of illumination emits monochromatic light having a peak wavelength that is approximately equal to a wavelength of peak sensitivity of one of said types of photosites.