From: Improving SVD-based image watermarking via block-by-block optimization on singular values
Degree
1
2
4
Reference [24]
22.61
26.35
27.56
Reference [25]
17.11
23.37
23.16
Reference [27]
19.24
23.67
25.13
Proposed method
k = r = 2
38.57
40.03
40.35
k = r = 4
37.07
38.89
39.67
k = r = 8
37.31
37.65
40.31