1. An image registration method, comprising: obtaining positional information from a device; obtaining first and second images from the device; aligning a plurality of regions in the first image with a corresponding plurality of regions in the second image to identify a plurality of corresponding regions; determining a search vector for each of the plurality of corresponding regions; selecting only those corresponding regions from the plurality of corresponding regions having a search vector consistent with the positional information to identify a plurality of consistent regions; and registering the first and second images using the plurality of consistent regions.