Improving Anticompression Robustness of JPEG Adaptive Steganography Based on Robustness Measurement and DCT Block Selection

Table 1

The number of modified coefficients under different relative payloads and quality factors using STCs with J-UNIWARD.

	0.2 bpnzAC		0.4 bpnzAC
	QF = 75	0.359 7	1.003 8	0.793 8	1.688 3
QF = 80	0.422 4	1.098 4	0.932 9	1.854 3
QF = 85	0.511 3	1.238 5	1.126 2	2.088 8