There are two separate hand databases: The Bosphorus Hand Database is intended for research on hand biometry, both based on the geometric silhouette and/or their texture residing in fingers and palm. The Bosphorus Hand Vein Database is intended for research on biometry based dorsal vein patterns of the hand.
Bosphorus Hand Database
The hand geometry plus texture data is acquired by using a commercial scanner with hands placed flat on the glass platen. There are no guiding pegs but the fingers should be apart from each other.
There are overall 4846 images distributed as:
- 642 subjects with 6 images/person, that is, three right-hand images and three left-hand images
- 276 subjects with three only left-hand images (These subjects are different than above mentioned 642 ones)
- 160 among 918 subjects have hand images with time lapses of several months
The database is accompanied by the software for hand normalization, feature extraction and performance evaluation.
Bosphorus Hand Vein Database
The hand vein data is acquired using NIR imaging technology with a monochrome NIR CCD camera (WAT-902H2 ULTIMATE ) equipped with an infrared lens. The back of the hand is irradiated by two IR light sources. The images have 300×240 pixel size with a gray-scale resolution of 8-bit.
There are overall 1575 images of the left hands of 100 subjects distributed as:
- Three left-hand images per subject taken under normal conditions (N: Normal),
- Three left-hand images per subject after having carried a bag weighing 3 kg. for one minute (B: Bag),
- Three left-hand images per subject after having squeezed an elastic ball repetitively (closing and opening) for one minute (Activity: A),
- Three left-hand images per subject after having cooled the hand by holding an ice pack on the surface of the back of the hand (Ice: I).
- Three right-hand images per subjects under normal conditions.
- Images of the left hands of 25 subjects after a time lapse ranging from two months to five months.