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Table 3 The parameters used for training libSVM for feature set TU-I, TU-P, and TU-IP on QCIF video dataset

From: HEVC double compression detection under different bitrates based on TU partition type

B1 − B2

(Kbps)

100–200

100–300

100–400

200–300

200–400

300–400

TU-I(5D)

 c

2.8284

5.6569

1.0000

1.0000

16.0000

5.6569

 g

2.8284

11.3137

16.0000

4.0000

0.0884

1.4142

TU-P(5D)

 c

4.0000

11.3137

2.8284

1.4142

1.0000

16.0000

 g

8.0000

0.3536

0.5000

8.0000

5.6569

16.0000

TU-IP(10D)

 c

5.6569

8.0000

2.0000

2.0000

2.8284

0.7071

 g

1.0000

0.7071

1.0000

16.0000

4.0000

11.3137