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. Author manuscript; available in PMC: 2009 Jan 26.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2008;1:3134–3137. doi: 10.1109/IEMBS.2008.4649868

Fig. 1.

Fig. 1

Row 1:Vessel enhancement(a) Original intensity map, (b) background estimation (opening), (c) background adjusted image (top-hat filter), (d) smoothed image (anisotropic diffusion filter + sqrt transformation). Row 2: Ridgeness measures(a) Mean curvature H, (b) Laplacian, (c) λ1, (d) λ2 (|λ1| ≥ |λ2|). Images in second row have been obtained by shifting the actual values. Dark: negative values, bright: positive values.