Texture Directionality-Based Digital Watermarking in Nonsubsample Shearlet Domain

Table 11

Comparison of NC values on Baboon image.

Comparison of NC values for four schemes
Attacks	DWT-SVD	NSCT-SVD	Ref. [17]/ST-SVD	Proposed/NSST-SVD
JPEG ()	0.9880	0.9983	0.9926	0.9976
Gaussian noise (Var = 0.001)	0.8989	0.9739	0.9718	0.9858
Salt and Pepper (Var = 0.001)	0.8416	0.9747	0.9934	0.9995
Scaling (scale = 1/4)	0.9441	0.9968	0.8742	0.9961
Average filtering ()	0.9222	0.9801	0.8467	0.9858
Median filtering ()	0.9803	0.9557	0.8936	0.9951