Image Processing Reference
In-Depth Information
3
10
9
8
7
6
5
4
3
2
80
(a)
60
40
20
2
4
3
2
1
0
-1
-2
-3
-4
1
0
0
-20
-40
-60
-1
-2
50
50
0
mm
-3
-80
-80
0
-50
-50
mm
-60 -40 -20
0
20 0 0 0
mm
3
80
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
60
40
20
2
(b)
4
3
2
1
0
-1
-2
-3
1
0
0
-20
-40
-60
-1
50
-2
0
-4
80
mm
-50
-3
-80
-80
60
40
20
0
-20
-60 -40 -20
0
20
40
60
80
-40
-60
-80
mm
mm
80
(c)
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2.0
3
60
40
20
2.6
2
2.4
1
2.2
0
0
-20
-40
-60
2
-1
-2
1.8
-3
-50
50
1.6
0
-80
0
50
-50
mm
mm
-80
-60 -40 -20
0
20
40
60
80
mm
Figure 9.12
Reference strength and cepstral reconstruction. Left side image is the phase of
V
Ψ
and right
side image is the cepstral reconstruction: (a) No reference added, (b) a small reference added, and (c) reference
amplitude is strong enough such that the phase is less than 2
π
.
angles. For data collected at 6 GHz, a good trade-off between high resolution
and minimum artifacts can be observed.
It is important to note the poor reconstruction and an apparent contrast
reversal at 9 and 10 GHz (see Figures 9.13c and 9.13d). It is observed that
the contrast of the recovered permittivity of the inner and outer cylinder is
reversed, that is, the recovered permittivity of the inner cylinder should be
around 3 but it is around 1.7 whereas the outer cylinder should have a permit-
tivity of 1.45 but we recover it around 3. There are two possible explanations
Search WWH ::
Custom Search