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Comparison with two state-of-the-art methods: (a1–a2) ground truth, (b1–b4) intensity-based method (Int), (c1–c4) fast patch-based method (FP), (d1–d4) classic feature-based method (CF), (e1–e4) feature selection-based method (FS), and (f1–f4) feature selection with joint dictionary learning-based method (FSJDL).
