Image Processing Reference
In-Depth Information
TABLE 12.4
Fossil Image Nearness Measurements
Image 1
Image (tol. classes)
Image 2
Image (tol. classes) TOD tNM HdNM wtAvg
Fig 12.3a
Fig 12.3a (544)
Fig 12.3e
Fig 12.3e (576)
0.81
0.30
0.73
0.67
Fig 12.3c
Fig 12.3c (738)
Fig 12.3b
Fig 12.3b (2031)
0.93
0.27
0.58
0.59
Fig 12.3e
Fig 12.3e (576)
Fig 12.3f
Fig 12.3f (325)
0.83
0.59
0.85
0.80
Fig 12.3e
Fig 12.3e (576)
Fig 12.3g
Fig 12.3g (348)
0.74
0.37
0.70
0.65
Fig 12.3g
Fig 12.3g (348)
Fig 12.3d
Fig 12.3d (290)
0.85
0.5
0.8
0.76
scale). The fossil image in Fig. 12.3g is broken up and quite indistinct compared with the
image in Fig. 12.3d, and, yet, each of the nearness measurements indicate a high degree
of correspondence between the fossils in the two images. This suggests a very practical
application of the nearness measures in comparing microfossils (a knowledge of the fossils
at different levels in sedimentary deposits provide indicators of the presence or absence of
natural gas and petroleum deposits).
12.5
Image Retrieval Experiments with Meghdadi Image Near-
ness Toolset
In this section, we illustrate experiments with the tool set in an image retrieval context.
Fig. 12.4 shows sample query images that we have used for retrieval from the SIMPLIcity
database (Wang, 2001).
(12.4a) Im1, Sam-
ple1
(12.4b) Im2, Sam-
ple2
(12.4c) Im3, Sam-
ple3
FIGURE 12.4: Sample Query Images used in Tab. 12.5
The similarity measurements using different combinations of grey scale and edge-o features as
well as different metrics (L 1 and L 2 ) are reported in Table 12.5. It should also be mentioned
that the tool set allows for 14 different features such as hue, saturation and contrast to name
a few. The subimage size was set to 20. It can also be observed from the first eight rows
of the Table 12.5, that tNM measure values are fairly low and Hausdorff measure values are
much higher than tNM.
12.5.1 tNM-measure Results
In this section, we present a sample of 17 images compared with the query image shown in
Figure 12.5a. The subfigures that form a part of Figure 12.5 are arranged in descending
order of their tNM measure values with the nearest image Im15 = 0.961 and the furthest
 
 
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