Table 2.

C_llr values for each combination of feature set and segmented region for Model 1 v 3.

	Segmented Region
Feature Set	whole region of interest		breech face	firing pin	breech face + firing pin
	including flowback	excluding flowback			feature concat.	score-level fusion
central moments	0.491	0.527	0.574	0.858	0.537	0.553
circle-moment invariants	0.467	0.532	0.557	0.901	0.537	0.551
Legendre moments	0.448	0.538	0.583	0.845	0.571	0.563
concentric-circle features (mag.)	0.435	–	–	–	–	–
concentric-circle features (mag. & phase)	0.390	–	–	–	–	–
Zernike moments (mag.)	0.390	0.502	0.547	0.752	0.459	0.476
Zernike moments (mag. & phase)	0.384	0.498	0.550	0.730	0.449	0.478