Patent ID: 8342627

Claim:
An apparatus comprising: a sensor controller configured to control a navigation sensor to capture a plurality of navigational images of a medium adjacent to the navigation sensor, wherein the capture of the plurality of navigational images occurs relative to a reference location located on the medium, determine a plurality of position values of the navigation sensor based at least in part on the plurality of navigational images, wherein the plurality of position values correspond to a movement of the navigational sensor from the reference location located on the medium, and determine, based at least in part on one or more of the plurality of position values of the navigation sensor, a direction of the movement of the navigation sensor from the reference location located on the medium; and a data filter configured to based at least in part on the determined direction of the movement of the navigation sensor from the reference location located on the medium, adjust one or more parameters of a data filtering scheme, and filter the plurality of position values of the navigation sensor in accordance with the one or more adjusted parameters of the data filtering scheme.