A Perceptive Approach to Digital Image Watermarking Using a Brightness Model and the Hermite Transform

Table 4

MOS averaged over all tested images obtained in experiment 2.

Observer	Group
	1		2		3		4
	O	W	O	O	W	W	W	O
1	3.164	3.171	3.187	3.042	3.506	3.199	3.258	3.222
2	3.860	3.900	4.090	4.210	3.490	3.530	3.590	3.910
3	4.280	4.021	4.240	4.694	4.330	4.571	3.840	4.400
4	4.000	3.633	4.000	3.519	4.000	3.473	4.000	3.579
5	4.783	4.810	4.740	4.667	4.910	5.000	4.818	4.778