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Selected feature set
| Feature | Description |
| 1–3 | Mean Luv value inside the region (Lμi,Uμi,Vμi) |
| 4–6 | Standard deviation of Luv value inside the region (Lσi,Uσi,Vσi) |
| 7–9 | Mean Luv value outside the region (Lμo,Uμo,Vμo) |
| 10–12 | Standard deviation of Luv value outside the region (Lσo,Uσo,Vσo) |
| 13–15 | Luv values of region centroid (Lc,Uc,Vc) |
| 16 | Region size (S) |
| 17 | Region compactness (C) |
| 18 | Region edge strength(E) |
