13. The system of claim 9 , wherein each of the multiple feature points comprises a set of pixels that are located adjacent to a visual feature in an image.
13. The system of claim 9 , wherein each of the multiple feature points comprises a set of pixels that are located adjacent to a visual feature in an image. 14. The system of claim 13 , wherein the set of pixels that are located adjacent to the visual feature surround the visual feature.