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Table 3 Average estimation accuracy a1/a2/a3 of QF 1 with various patch sizes ((a1) 64 × 64; (a2) 128 × 128; (a3) 256 × 256), QF 1 and QF 2

From: Detection of shifted double JPEG compression by an adaptive DCT coefficient model

QF1

QF2

 

50

60

70

80

90

50

0.62/0.95/0.99

0.78/0.97/0.97

0.90/1.00/1.00

0.95/1.00/1.00

0.96/1.00/1.00

60

0.48/0.54/0.59

0.62/0.82/0.95

0.75/0.97/0.98

0.92/1.00/1.00

0.93/1.00/1.00

70

0.13/0.14/0.13

0.36/0.52/0.61

0.65/0.85/0.92

0.79/0.99/0.98

0.92/1.00/1.00

80

0.13/0.12/0.10

0.14/0.13/0.12

0.44/0.53/0.62

0.68/0.85/0.94

0.82/0.98/0.96

90

0.08/0.08/0.09

0.12/0.14/0.13

0.14/0.13/0.14

0.44/0.55/0.59

0.69/0.82/0.89