A Robust Watermarking Scheme Based on the Mean Modulation of DWT Coefficients

Table 4

NC comparison with [35] and [39] using a message length of 512 bits.

Benchmark image	Lena			Goldhill			Peppers
watermarking method	[35]	[39]	Proposed	[35]	[39]	Proposed	[35]	[39]	Proposed
Median filtering (33)	0,9000	0,9300	0,9770	0,8500	0,9000	0,9725	0,9200	0,9200	0,9713
Median filtering (55)	0,7600	0,5700	0,8199	0,6600	0,4600	0,7296	0,7500	0,6200	0,7782
Resize (0,5)	0,8800	0,9700	0,9730	0,8400	0,9400	0,9667	0,8800	0,9500	0,9696
Cropping (25%)	0,6600	0,8800	0,9374	0,6500	0,8200	0,9232	0,6400	0,7600	0,9493
Image sharpening	0,9700	0,4700	1	0,9500	0,5400	1	0,9600	0,4600	1
Gaussian filter	0,8800	0,9900	1	0,9300	0,9900	1	0,9200	0,9800	1