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

Table 1

Time costs comparison when calculating SVD and 2-norm of different matrix.

Size of matrix	SVD (s)	2-norm (s)
Lena ()	0.0083	0.0030
Lena ()	0.4043	0.1051
Man ()	0.0071	0.0054
Man ()	0.2474	0.1022
Plane ()	0.0084	0.0039
Plane ()	0.0508	0.0298