Title: System for contactless recognition of hand and finger lines
Application Number: 99807854 Application Date: 1999.04.21
Publication Number: 1307711 Publication Date: 2001.08.08
Approval Pub. Date: 2004.04.14 Granted Pub. Date: 2004.04.14
International Classifi-cation: A61B5/117;G06K9/20
Applicant(s) Name: Contactless Sensor Tech. GmbH Address:
Inventor(s) Name: Rudolf Hauke;Hans J. Einighammer;Jens Einighammer
Attorney & Agent: cheng tianzheng
Abstract:
    The invention relates to a method for imaging hand and/or finger lines with a camera which functions without contacting the skin with the recording device. By using linear or circular polarized light in the illuminating and imaging beam path, a separate representation of the upper and lower skin pattern is made possible. In doing this, an image of the skin relief which is rich in contrast is obtained. In addition, the information regarding the deeper lying skin layers through which blood flows can be obtained. An algorithm searches the skin pattern of the hand surface for line elements of different thicknesses and direction (vectors). The calculated numeric identification contains total frequencies of occurrence of vectors, amplitudes and phases of harmonic components of projections of vector images of both patterns. The method makes it possible to identify people from a distance, to completely protect the measuring device and to provide an improved security against deception.
Time: 9
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