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Column (a) original MicroCT images. (b) ground truth of classification. (c) results by our method. (d) results by FCM. (e) results by HCA. (f) results by DBSCAN. (g) results by GMMs. In (c), (d), (e), (f), and (g), white color means enamel; black color means background; grey color means dentine; dark grey color means pulp.
