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Table 4 The classification accuracy for electrostatic copiers (%)

From: Detecting documents forged by printing and copying

   

Predicted

 
  

Laser printer

Inkjet printer

Copier

 

C1

0.99

12.13

86.88

 

C2

4.10

3.54

92.36

 

C3

39.89

0.15

59.96

 

C4

18.28

0

81.72

Actual

C5

12.52

0

87.48

 

C6

0.74

4.75

94.51

 

C7

5.27

0

94.73

 

C8

6.07

1.72

92.21

 

C9

3.89

2.29

93.82