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

Table 5

Experimental results under the attack of “Salt and Pepper” noise.

Attack strength	d = 0.001	d = 0.005	d = 0.01	d = 0.02	d = 0.05
Lena
PSNR	34.8891	28.3823	25.3281	22.3135	18.4735
MSE	21.0945	94.3727	195.0891	381.7102	924.1257
NC	0.9814	0.9741	0.9741	0.9268	0.8262
The extracted watermark
Boat
PSNR	35.5080	28.3722	25.3806	22.4128	18.3500
MSE	18.2927	94.5926	188.3749	373.0794	950.7809
NC	0.9834	0.9712	0.9482	0.9331	0.7866
The extracted watermark
Barbara
PSNR	35.3764	28.0243	25.2388	22.5369	18.4612
MSE	18.8555	102.4817	194.6269	362.5728	926.4612
NC	0.9814	0.9717	0.9727	0.9316	0.7861
The extracted watermark