Pit Pattern Classification in Colonoscopy using Wavelets - WaveLab

5 Results
(a) 2 classes
(b) 6 classes
Figure 5.13: Distance matrices for the two classes and the six classes case (Pit pattern images)
Class 1 2 3 4 5 6
1 96 4 0 0 0 0
2 7 93 0 0 0 0
3 0 0 77 9 9 4
4 0 0 10 64 14 12
5 0 0 4 19 52 24
6 0 0 0 8 27 64
Table 5.18: Result distribution matrix for CC for 6 classes (Outex images)
result distribution matrix for the six classes case is quite different compared to the result
distribution matrices for the previous methods, as we notice from table 5.18. We can see
that while the first two classes get classified fairly well, the classification rate is getting
lower for the classes 3 to 6, with the lowest classification result of 52% only for class 4.
Figure 5.14 shows the distance matrices for the two classes and the six classes case. In
contrast to the distance matrices presented above for the pit pattern images, these matrices
are similar to the example distance matrices presented in figure 4.5. Especially for the distance
matrix for the two classes case shown in figure 5.14(a) we are able to clearly identify
a typical structure for low intra-class distances and high inter-class distances.
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