Table 1.
Description of lung nodule feature extraction.
| Feature | Descriptors | Representation |
|---|---|---|
| Gray | 3 gray features (gray mean, variance, and entropy) | f 1, f 2, f 3 |
| Morphology | 7 invariant moments features (Hu moment invariants) |
f
4,…, f
10, f 11,…, f 15, f 16,…, f 19, f 20 |
| 5 geometrical features (perimeter, area, roundness, rectangularity, and maximum diameter) | ||
| 4 medical signs (calcification area and degree, cavitary area, and degree) and Fourier descriptor | ||
| Texture | 14 texture features from GLCM (contrast, angular second moment, entropy, inverse difference moment, etc.) with 4 different angles as well as the mean, variance of them | f 21, f 22,…, f 104 |