(a) original
(b)
noisy f
(c) k=1, PSNR=20.1
(d) k=3, PSNR=22.1
(e) k=8, PSNR=24.5
(f)
(g)
k=1, PSNR=22.5
(h)
(i)
(j) k=5, PSNR=24.5
k=12, PSNR=26.1
k=2, PSNR=25.2
k=3, PSNR=26.2
7
7
||f-uk||2
6
6
||f-uk||2
noisenorm
norm2 of f and u
norm2 of f and u
noisenorm
5
4
3
2
5
4
3
2
1
0
5
10
15
0
2
k
(k)
converge of constant
k
(l)
converge of varying
4
k
k
6
8