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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