Image Watermark Based on Extended Shearlet and Insertion Using the Largest Information Entropy on Horizontal Cone

Table 2

Experimental results under the scaling attack.

Scaling parameter	1/4	1/2	3/4	3/2	2	4
Lena
PSNR	28.9888	34.6526	40.2526	45.8866	45.7492	45.9472
MSE	82.0732	22.2750	6.1350	1.6766	1.7304	1.6533
NC	0.7778	0.9302	0.9731	0.9824	0.9819	0.9819
The extracted watermark
Boat
PSNR	26.3117	31.1662	35.9492	42.4460	42.2792	42.5013
MSE	152.0217	49.7120	16.5257	3.7024	3.8473	3.6540
NC	0.6982	0.8154	0.9009	0.9771	0.9692	0.9712
The extracted watermark
Barbara
PSNR	23.6562	25.4999	29.1969	35.8845	35.6902	35.9257
MSE	280.1925	183.2677	78.2331	16.7738	17.5412	16.6155
NC	0.7671	0.9009	0.9658	0.9756	0.9751	0.9751
The extracted watermark