SIFT Based Vein Recognition Models: Analysis and Improvement

Table 4

Influence of CEs on the Precision-Recall/Equal Error Rate of SIFT descriptor matching (PUT Vein Database).

Evaluation item	Linear/nonlinear functional enhancement (LNFE)
	IN	GLS	CS	GC08	LS	UM	HBF	HF	INE
PR	−2.93	−8.75	−2.53	−1.36	−3.21	−12.35	−3.12	−1.36	−1.15
EER	−1.05	−3.11	−0.92	−0.47	−0.93	−3.47	−1.21	−0.56	−0.37
Evaluation item	HE and its variants (HEs)				Hierarchical enhancement models (HEM)
	HE	AHE	CLAHE	CLHE	IHE	DHE	RASF	HHE	HEHBF
PR	−9.21	−27.15	−9.21	−13.15	−36.15	−11.25	−11.03	−19.12	−9.36
EER	−1.76	−6.13	−2.13	−5.12	−8.13	−2.13	−2.12	−6.72	−2.71