A Strong Robust Zero-Watermarking Scheme Based on Shearlets’ High Ability for Capturing Directional Features

Table 7

The values of distorted host images and values of extracted watermarks after scaling.

Host image			2	4
	SSIM/NC	SSIM/NC	SSIM/NC	SSIM/NC
Boat	0.91/0.9836	0.97/0.9810	0.99/0.9980	0.99/0.9980
Goldhill	0.88/0.9763	0.96/0.9869	0.99/0.9915	0.99/0.9915
Baboon	0.73/0.9676	0.88/0.9770	0.97/0.9928	0.97/0.9922
Barbara	0.80/0.9783	0.92/0.9889	0.98/0.9922	0.98/0.9922
Peppers	0.89/0.9817	0.93/0.9993	0.98/1.0000	0.98/1.0000
Man	0.89/0.9784	0.95/0.9856	0.99/0.9948	0.99/0.9948