EURASIP Journal on Information Security

Table 1 Accuracy obtained by proposed approach compared to Bianchi et al. ([17]), Galvan et al. ([4]), Dalmia et al. [19] and Niu et al. ([28]) with different combinations of QF₁/ QF₂ by considering the standard quantization tables

From: Estimating Previous Quantization Factors on Multiple JPEG Compressed Images

QF₁	QF₂=80					QF₂=90
	Proposed	[17]	[4]	[19]	[28]	Proposed	[17]	[4]	[19]	[28]
55	0.57	0.42	0.43	0.5	0.28	-	-	-	-	-
60	0.54	0.31	0.42	0.49	0.6	0.76	0.66	0.63	0.68	0.73
65	0.58	0.21	0.47	0.54	0.37	0.77	0.66	0.65	0.69	0.6
70	0.66	0.2	0.56	0.59	0.52	0.78	0.51	0.64	0.72	0.74
75	0.52	0.09	0.61	0.49	0.19	0.82	0.74	0.47	0.69	0.85
80	0.04	0	0	0	0.01	0.82	0.31	0.68	0.65	0.88
85	0.33	0.16	0	0	0.05	0.75	0.14	0.78	0.47	0.85
90	0.22	0.06	0	0	0.5	0.23	0	0	0	0.03
95	0.17	0.02	0.01	0.02	0.43	0.38	0.05	0.01	0	0.75
MEAN	0.40	0.15	0.27	0.29	0.33	0.66	0.35	0.43	0.43	0.68

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