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Items for "biometrics"

Phenology of a deep-water population of Caulerpa racemosa var. cylindracea in the northwestern Mediterranean Sea

Thalli of the invasive alga Caulerpa racemosa (Caulerpales, Chlorophyta) were measured monthly at 22 m depth off Villefranche-sur-Mer (southeastern France, Mediterranean Sea)...

Keywords: biomass, biometrics, Caulerpa racemosa, invasive species, stolon

01/2005 | Botanica Marina, Walter de Gruyter
Photogrammetric fingerprint unwrapping

Fingerprints are important biometric cues. Compared to conventional fingerprint sensors the use of contact-free stereoscopic image acquisition of the front-most finger segment has a set of advantages: Finger deformation is avoided, the entire relevant area for biometric use is covered, some technical aspects like sensor maintenance and cleaning are facilitated, and access to a three-dimensional reconstruction of the covered area is possible.

We describe a photogrammetric workflow for nail-to-nail fingerprint reconstruction: A calibrated sensor setup with typically 5 cameras and dedicated illumination acquires adjacent stereo pairs...

Keywords: photogrammetry, biometrics, fingerprint unwrapping, 3D fingerprint, fingertip modeling

01/2008 | Journal of Applied Geodesy, Walter de Gruyter