Table 4.
Results of nodule classification at wavelet second decomposition level
| Base | Angle | Sub-band | Features | Specificity | Sensitivity | Preciseness |
|---|---|---|---|---|---|---|
| Db1 | 0° | HH2 | Clpr-Ener | 68.18% | 68.18% | 71.11% |
| Db2 | 0° | LL | Autc-Sent | 36.36% | 91.30% | 64.44% |
| Db4 | 0° | LL | Autc-Ent | 36.36% | 95.45% | 65.90% |
| Db1 | 45° | LL | Clsh-Ener | 82.60% | 68.18% | 75.55% |
| Db2 | 45° | LL | Autc-Ener | 73.91% | 63.63% | 68.88% |
| Db4 | 45° | LL | Autc-Sent | 82.6% | 59.09% | 71.11% |
| Db1 | 90° | LL | Autc-Ener | 86.95% | 50% | 68.88% |
| Db2 | 90° | LL | Autc-Ent | 47.82% | 95.45% | 71.11% |
| Db4 | 90° | LL | Autc-Ent | 54.16% | 71.42% | 62.22% |
| Db1 | 135° | LL | Autc-Ener | 65.21% | 63.63% | 64.44% |
| Db2 | 135° | LL | Autc-Ent | 60.86% | 77.27% | 68.88% |
| Db4 | 135° | HH | Autc-Sent | 90.90% | 56.21% | 73.33% |
The bold data represent the best value obtained.