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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: IEEE Trans Med Imaging. 2009 Aug 25;29(3):650–668. doi: 10.1109/TMI.2009.2030797

Fig. 8.

Fig. 8

Approximating the kernel function k(xi, xj). The scattered points corresponds to the estimation of k*(xi, xj) via Eq. (51). The red curve corresponds to fitting the scattered points so that k̃(xi, xj) is strictly a function of the geodesic distance between xi and xj.