Table 5. Classification results of three methods (%) with the spatial pyramid scheme.

	intensity histogram		GLCM-element		BoW
L	single-level	pyramid	single-level	pyramid	single-level	pyramid
0	82.49		86.28		87.79
1	86.28	86.90	88.53	88.33	91.28	91.14
2	87.14	87.06	88.83	89.23	90.81	91.13
3	87.50	87.54	89.64	89.72	90.86	91.02