Table 2.

Curvature ratios of finger vein image and blood flow image in perfusion at the vein positions.

		Curvature
Repeatability Test	Vein Positions	Blood flow (Cb)	Finger vein (Cv)	Liveness index (Li = Cb/Cv)
1st	I	1.934 × 10−2	1.697 × 10−4	114.0
	II	2.004 × 10−2	1.709 × 10−4	117.3
2nd	I	1.770 × 10−2	1.546 × 10−4	114.4
	II	2.197 × 10−2	1.999 × 10−4	109.9
3rd	I	1.127 × 10−2	1.003 × 10−4	112.4
	II	3.233 × 10−2	2.916 × 10−4	110.9
Average				113.2