Adaptive Watermarking Scheme Using Biased Shift of Quantization Index

Table 2

Error ratios resulting from various attacks for JPEG and JPEG2000 watermarking.

Attack			Error ratio(%)
JPEG Quality (%)	JPEG	J2K	JPEG	JPEG2K
	40	60	0	0
	20	40	0	0
	0	20	0	0.8
JPEG2000 (bpp)	1		0.3	0
	0.5		0.3	0
	0.25		0.7	0
Gaussian Noise (%)	3		3.5	1.7
	5		5.5	4.3
Sharpening			2.2	0.7
Blurring			2.7	1.3
Cropping (%)	10		1.5	1.5
	15		3.2	3.8
	20		5.7	5.0