Table 1

Selected feature set

Feature	Description
1–3	Mean Luv value inside the region (L_{μ_i},U_{μ_i},V_{μ_i})
4–6	Standard deviation of Luv value inside the region (L_{σ_i},U_{σ_i},V_{σ_i})
7–9	Mean Luv value outside the region (L_{μ_o},U_{μ_o},V_{μ_o})
10–12	Standard deviation of Luv value outside the region (L_{σ_o},U_{σ_o},V_{σ_o})
13–15	Luv values of region centroid (L_c,U_c,V_c)
16	Region size (S)
17	Region compactness (C)
18	Region edge strength(E)