A Robust Watermarking Scheme Based on Maximum Wavelet Coefficient Modification and Optimal Threshold Technique

Table 4

Comparisons of robustness against incidental manipulation.

	Media ()	Media ()	Resizing (0.5)	Cropping (25%)	Sharpening	Gauss
WTQ [14] (39.6 dB)	0.51	—	—	—	0.46	0.64
SDWCQ [26] (42.2 dB)	0.88	0.74	0.86	0.70	0.99	0.86
MWCQ [27] (41.5 dB)	0.90	0.76	0.88	0.66	0.97	0.88
SD-QIM [32] (43.3 dB)	0.94	0.42	0.98	0.87	0.21	1
Our method (42.2 dB)	0.96	0.62	0.93	0.91	0.91	0.99