Texture Directionality-Based Digital Watermarking in Nonsubsample Shearlet Domain

Table 10

Comparison of NC values on Lena image.

Comparison of NC values for four schemes
Attacks	DWT-SVD	NSCT-SVD	Ref. [17]/ST-SVD	Proposed/NSST-SVD
JPEG ()	0.9971	1.0000	0.9938	0.9751
Gaussian noise (Var = 0.001)	0.7673	0.9683	0.9859	0.9960
Salt and Pepper (Var = 0.001)	0.8268	0.9554	0.9622	0.9961
Scaling (scale = 1/4)	0.9354	0.9866	0.9427	0.9829
Average filtering ()	0.9156	0.9731	0.9182	0.9888
Median filtering ()	0.9980	0.9321	0.9718	0.9927