Patent ID: 7782296

Claim:
A device comprising: optical components that are operable to sense surface-independent movement of a pointing object within a first substantially planar region adjacent to the device, the optical components including at least one image sensor that is operable to output pixel values corresponding to the movement, the at least one image sensor comprising a row of pixels included in the first substantially planar region, the optical components further operable to sense surface-independent secondary movement of the point object within a second substantially planar region adjacent to the device, the second substantially planar region being substantially parallel and non-intersecting to the first substantially planar region, the at least one image sensor comprising a row of pixels included in the second substantially planar region, wherein the optical components include at least two image sensors having at least a part within the first substantially planar region, and further wherein the at least two image sensors are limited to detecting light from the first substantially planar region by use of selected rows of pixels of the at least two image sensors; and tracking logic that is operable to determine coordinates associated with the movement and secondary movement of the pointing object, based on the pixel values, and provide the coordinates for translation into an action on a display based on a relationship between coordinates associated with the movement within the first substantially planar region and coordinates associated with the secondary movement within the secondary substantially planar region, wherein the tracking logic is operable to determine the coordinates based on an apparent size of the pointing object as determined from the pixel values, relative to reference size information associated with the pointing object.