(a) k=1, PSNR=19.7dB
(b) k=5, PSNR=25.1dB
(e) k=1, PSNR=25dB
(f) k=2, PSNR=30.2dB
0
(d) k=21, PSNR=28.8dB
(g) k=3, PSNR=28.3dB
8
(h) k=5, PSNR=25.4dB
4
norm2 of f and u
6
4
||f-uk ||2
norm2 of f and u
||f-uk ||2
8
scale parameter
(c) k=15, PSNR=30dB
noisenorm
6
4
2
2
0
0
10
k
(i) trend of
k as k increases
20
3
noisenorm
2
1
0
0
10
20
30
k
(j) converge of constant
0
5
10
k
k
(k) converge of varying
k