TABLE 4

Feature Ranks with Regard to Average Absolute COV for 4 Largest Spheres (S₃₇–S₁₇).

Feature	Feature category	S₃₇ COV rank	S₂₈ COV rank	S₂₂ COV rank	S₁₇ COV rank
Information correlation	GLCM	0.00^*	0.00^*	0.00^*	0.00^*
Compactness	Shape	0.01^*	0.02^*	0.02^*	0.03^*
Volume	Shape	0.02^*	0.02^*	0.03^*	0.03^*
Spheric dice coefficient	Shape	0.03^*	0.03^*	0.07^†	0.1^‡
Sum entropy	GLCM	0.17^‡	0.17^‡	0.18^‡	0.19^‡
Correlation	GLCM	0.14^‡	0.18^‡	0.22	0.29
Entropy	GLCM	0.19^‡	0.19^‡	0.19^‡	0.21
Small zone size emphasis	GLZSM	0.26	0.27	0.28	0.29
Difference entropy	GLCM	0.31	0.31	0.32	0.33
Zone size percentage	GLZSM	0.53	0.53	0.56	0.62
Inverse difference	GLCM	0.57	0.59	0.58	0.56
Coarseness	NGTDM	0.59	0.58	0.59	0.59
Inverse difference moment	GLCM	0.78	0.81	0.80	0.76
Sum average	GLCM	0.83	0.83	0.83	0.83
Dissimilarity	GLCM	1.07	1.07	1.07	1.08
Small zone low gray emphasis	GLZSM	1.12	1.10	1.10	1.11
Low gray-level zone emphasis	GLZSM	1.2	1.17	1.16	1.09
Maximum probability	GLCM	1.2	1.19	1.19	1.21
High gray-level zone emphasis	GLZSM	1.37	1.34	1.3	1.28
Angular second moment	GLCM	1.35	1.34	1.32	1.31
Auto correlation	GLCM	1.35	1.35	1.35	1.36
Texture strength	NGTDM	1.56	1.39	1.29	1.26
Sum variance	GLCM	1.35	1.35	1.35	1.36
Sum-of-squares variance	GLCM	1.35	1.35	1.35	1.36
Small zone high gray emphasis	GLZSM	1.42	1.39	1.37	1.35
Cluster prominence	GLCM	1.68	1.69	1.69	1.7
Cluster shade	GLCM	3.56	1.63	1.61	1.61
Zone size nonuniformity	GLZSM	1.7	1.76	1.92	1.85
Busyness	NGTDM	1.73	1.79	1.78	1.7
Complexity	NGTDM	2.12	1.86	1.72	1.65
Contrast	GLCM	2.03	2.03	2.04	2.06
Difference variance	GLCM	2.03	2.04	2.05	2.07
Contrast	NGTDM	1.69	2.10	2.35	2.46
Gray-level nonuniformity	GLZSM	2.1	2.12	2.17	2.21
Large zone high gray emphasis	GLZSM	2.75	2.65	2.55	2.41
Large zone size emphasis	GLZSM	3.23	3.24	3.22	3.13
Large zone low gray emphasis	GLZSM	3.29	3.28	3.26	3.21

↵* COV < 5%.
↵† 5% ≤ COV < 10%.
↵‡ 10% ≤ COV < 20%.
COVs without footnotes are ≥20%. Smaller rank values correspond to smaller COV feature variations across their 12 feature extraction configurations and imaging systems.