28. The computer-readable medium of claim 27 , wherein determining the plurality of second similarity scores corresponding to each candidate keypoint comprises: computing each of the plurality of second similarity scores based, at least in part, on a measure of cross-correlation between the image patch associated with the candidate keypoint and the corresponding image section.
28. The computer-readable medium of claim 27 , wherein determining the plurality of second similarity scores corresponding to each candidate keypoint comprises: computing each of the plurality of second similarity scores based, at least in part, on a measure of cross-correlation between the image patch associated with the candidate keypoint and the corresponding image section. 29. The computer-readable medium of claim 28 , wherein the measure of cross-correlation is determined based, in part, by performing a cross-correlation method selected from one of: Normalized Cross-Correlation; or Sum of Squared Differences; or Sum of Absolute Differences.