From: Assessing JPEG2000 encryption with key-dependent wavelet packets
Res. at level
Quality
Entropy (anisouni)
0
1
1321.9
1/2
660.5
2
1/4
329.7
3
1/8
164.4
4
1/16
81.7
5
1/32
40.3
6
1/64
19.7
7
1/128
9.3
8
1/256
4.2
9
1/512
1.5
10
1/1024
0.0