Table 1. A summary of the considered finger vein database.

Databases	Subjects	No fingers per subject	No. samples per finger	No. of sessions	Image size	Image format	Total no. of images
FV-USM	123	4	6	2	640 × 480	JPEG	5,904
SDUMLA	106	6	6	1	320 × 240	BMP	3,816
MMCBNU_600	100	6	10	1	640 × 480	BMP	6,000
NUPT-FPV	140	6	10	2	300 × 400	BMP	16,800