Patent ID: 8325379

Claim:
A method for tracking movement of an apparatus over a medium, wherein the medium comprises one or more images, the method comprising: in response to the apparatus being moved over the medium, performing a first measurement of a translation path of the apparatus over the medium, wherein performing the first measurement of the translation path of the apparatus over the medium includes capturing a plurality of navigational measurements to measure the translation path of the apparatus over medium, wherein the plurality of navigational measurements are based at least in part on the one or more images on the medium, and independent of the first measurement of the translation path of the apparatus over the medium, performing a second measurement of the translation path of the apparatus over the medium; comparing the first measurement of the translation path of the apparatus over the medium to the second measurement of the translation path of the apparatus over the medium to determine whether a difference exists between (i) the first measurement of the translation path of the apparatus over the medium and (ii) the second measurement of the translation path of the apparatus over the medium; and in response to a difference existing between the first measurement of the translation path of the apparatus over the medium and the second measurement of the translation path of the apparatus over the medium, generating one or more scaling factors based at least in part on the difference between the first measurement of the translation path of the apparatus over the medium and the second measurement of the translation path of the apparatus over the medium, and creating a lookup table including the one or more scaling factors, wherein the one or more scaling factors in the lookup table is usable by the apparatus to adjust navigational measurements subsequently captured.