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Figure 2: Second experiment on noise removal and edge preservation. (a) A real CT image, (b)–(f) Smoothing results after the Perona-Malik method, TV, median filtering, bilateral filter, and our method, respectively; (g)–(l) Edges obtained by applying the Canny operator on (a)–(f), respectively. The interested lymph node is labeled by green arrow. The proposed method outperformed its peers by preserving important edge information of node 1 adaptively.