Image Processing Reference
In-Depth Information
Figure 9.22 shows reconstruction attempts of FoamDielInt using vari-
ous methods. Figure 9.22a shows the reconstructed image of object using a
two-step inexact Newton method (Estatico et  al., 2005), where Figure 9.22a
is reconstructed at 2 GHz and Figure 9.22b is reconstructed at 5 GHz. Both
the reconstructions show artifacts, and the quality of reconstruction seems
poor. The recovered permittivity values are far off from the actual values.
Figure 9.22c shows reconstruction from an iterative regularized contrast
source inversion (CSI) method (van den Berg et al., 1999). The reconstruction
quality is average, and it fails to give a good quantitative estimate of relative
permittivity.
(a)
(b)
(c)
0.1
1.2
1
0.8
0.6
0.4
0.2
0
0.1
0.5
0
2
4
6
8
10
12
14
16
2
1.8
0.45
1.6
0.4
0.05
0.05
0.35
1.4
0.3
1.2
0
0
0.25
1
0.8
0.6
0.4
0.2
0
0.2
0.15
-0.05
-0.05
0.1
0.05
-0.1
-0.1
0
0
5
10
15
-0.1
-0.05
0
0.05
0.1
-0.1
-0.05
0 .050.1
x (m)
x (m)
(d)
(e)
(f )
100
3
3
3
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
50
2.5
2.5
2.5
0
2
2
2
-50
1.5
1.5
1.5
1
-100
-100
-0.05
0
0.05
-0.05
0
0.05
-50
0
50
100
x (mm)
(g)
(h)
(i)
y
100
3
50
2.5
0
x
2
-50
1.5
1
-10 -100
-50
0
50
100
4
1
x (mm)
2.6
Re{τ( x , y )}
0.0
y
(j)
(k)
(l)
300
250
3
2.0
0.05
200
2.5
x
1.0
0
150
2
100
-0.05
1.5
0.0
50
-0.1
-0.1 -0.05
1
0 0
2.6
Re{τ( x , y )}
0.0
0 .05
50
100
150
200
250
300
x (m)
Figure 9.22 Comparison of reconstruction algorithms on FoamDielInt: (a) The two-step inexact Newton
method (2 GHz), (b) the two-step inexact Newton method (5 GHz), (c) CSI Method, (d) MGM method, (e) MGM method
with adaptive multiscale, (f) DTA/CSI methods, (g) DTA/CSI methods, (h) Bayesian inversion method, (i) IMSA (plane
wave) method, (j) IMSA (line source) method, (k) general iterative method, and (l) cepstral method.
Search WWH ::




Custom Search