Adaptive Watermarking Scheme Using Biased Shift of Quantization Index

Table 1

Subband robustness in JPEG.

JPEG Quality	Error ratio (%)
	𝐿𝐿4	𝐿𝐻4	𝐻𝐿4	𝐻𝐻4
12	0.0	0.0	0.0	0.0
10	0.0	0.0	0.0	0.5
8	0.0	0.3	0.3	20.9
6	0.0	3.6	3.3	34.3
4	2.9	23.8	24.7	55.5
2	1.6	43.0	48.8	69.2
0	36.7	58.2	65.4	76.1