Table 1 Classification performance using different feature types between Grade 1 and Grade 2, Grade 1 and Grade 3 and Grade 1 and Grade 4 (mean ± std, UNIT: %)

76.73 ± 4.39

73.20 ± 5.13

76.63 ± 6.04

70.52 ± 4.84

75.98 ± 2.18

78.73 ± 6.43

75.97 ± 6.99

79.56 ± 12.17

58.21 ± 21.23

77.19 ± 5.53

75.14 ± 13.01

70.75 ± 12.48

73.19 ± 13.99

81.75 ± 20.80

75.03 ± 4.17

75.58 ± 9.33

71.41 ± 6.66

75.08 ± 9.47

80.88 ± 14.18

74.10 ± 2.02

79.59 ± 3.29

76.04 ± 6.25

81.33 ± 11.09

69.74 ± 7.51

78.24 ± 4.64

53.88 ± 7.85

46.72 ± 10.51

52.75 ± 11.40

39.96 ± 8.63

52.23 ± 4.55

76.52 ± 3.06

73.20 ± 3.07

76.49 ± 5.49

63.82 ± 11.27

75.45 ± 2.19

93.19 ± 4.01

83.70 ± 6.97

80.87 ± 5.97

80.05 ± 5.56

83.69 ± 8.50

93.14 ± 0.26

78.38 ± 10.62

86.38 ± 8.47

76.76 ± 5.97

83.71 ± 9.89

93.23 ± 8.16

89.24 ± 10.06

75.33 ± 7.63

83.42 ± 6.72

83.62 ± 7.92

93.70 ± 7.22

88.64 ± 9.82

77.92 ± 6.37

82.41 ± 6.16

83.66 ± 7.47

93.11 ± 0.55

80.86 ± 8.59

85.35 ± 9.13

78.16 ± 5.92

83.99 ± 8.97

86.38 ± 8.07

67.62 ± 14.06

61.71 ± 11.87

60.19 ± 11.09

67.33 ± 16.07

93.31 ± 3.65

82.68 ± 7.27

81.80 ± 5.95

79.41 ± 5.38

83.61 ± 8.81

95.15 ± 3.98

82.93 ± 4.56

88.24 ± 5.50

86.91 ± 5.43

84.27 ± 3.14

97.14 ± 3.91

80.76 ± 7.69

88.95 ± 6.45

86.19 ± 5.23

83.52 ± 3.61

93.14 ± 4.72

85.04 ± 7.13

87.52 ± 6.15

87.71 ± 7.71

85.05 ± 5.53

93.40 ± 4.73

84.59 ± 5.85

87.84 ± 5.37

87.69 ± 7.74

85.15 ± 4.62

97.14 ± 3.91

81.98 ± 5.08

88.83 ± 6.17

86.45 ± 5.10

83.84 ± 3.71

90.28 ± 7.85

65.81 ± 9.31

76.47 ± 11.08

73.90 ± 10.99

68.57 ± 6.24

95.21 ± 4.00

82.42 ± 5.23

88.33 ± 5.44

86.83 ± 5.43

84.17 ± 2.36