(e)
k=1, PSNR=27.2dB
(b)
k=2, PSNR=28.7dB
(f)
k=2, PSNR=30.2dB
k=1, PSNR=26.3dB
9.5
norm2 of f and u
scale parameter
10
9
8.5
8
7.5
(i)
0
10
20
k
trend of k as k increases
(c)
(d)
k=15, PSNR=23.5dB
(g) k=3, PSNR=28.4dB
3
3.5
2.5
3
2
||f-uk ||2
noisenorm
1.5
1
0.5
0
0
(j)
10
20
30
k
converge of constant
k
k=21, PSNR=23.5dB
(h) k=5, PSNR=25.6dB
norm2 of f and u
(a)
2.5
2
||f-uk ||2
noisenorm
1.5
1
0.5
0
5
10
k
(k) converge of varying k