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Registration results for LeFiR, UniG, SURF, SIFT, and FFD using different numbers of landmarks measured by: (a) SSDi; (b) SSDd; (c) shows the corresponding computational times for these five methods. The comparison results suggested that the UniG, SURF, SIFT, and FFD methods required higher dense sampling of the grid and longer computational times to obtain the same level of registration performance as LeFiR.
