1. A computer-implemented method, implemented by hardware in combination with software, the method comprising: for each particular template image of a plurality of template images: (A) determining a first set of feature points associated with said particular template image; (B) determining a second set of feature points associated with said particular template image, said second set of feature points (i) being a subset of said first set of feature points, and (ii) comprising fewer feature points than said first set of feature points; (C) associating said first set of feature points and said second set of feature points with said particular template image; and (D) storing said first set of feature points and said second set of feature points, wherein said second set of feature points associated with said particular template image comprises a cover set of feature points associated with said particular template image, and wherein the cover set comprises a subset of said feature points associated with said particular template image wherein one of the feature points in the cover set is associated with substantially every true positive match of feature points associated with said particular template image with feature points associated with a test image.