초록 ▼

A process for reproducing hand and/or finger lines with a camera works without skin contact with the recording device. By using linearly or circularly polarized light in the paths of the illuminating and the reproducing light rays, it is possible to obtain separate representations of the patterns of

A process for reproducing hand and/or finger lines with a camera works without skin contact with the recording device. By using linearly or circularly polarized light in the paths of the illuminating and the reproducing light rays, it is possible to obtain separate representations of the patterns of the epidermis and the hypodermis. An image of the relief of the skin that is rich in contrast is obtained in this way, and it is possible to acquire information from the deeper disposed layers of the skin already supplied with blood. An algorithm searches the skin patterns of the palm of the hand for line elements of different strengths and directions (vectors). The computed numerical identification contains overall frequencies of vectors as well as amplitudes and phases of frequency components of projections of the vector image of both patterns. The process permits placing the person to be identified in a separate location from the measuring device, thereby offering complete protection of the system and enhanced security against fraud.

대표청구항 ▼

1. A method of identifying persons with the use of a light source (15), a polarization filter and a camera (10) with the help of their hand and/or finger lines, characterized in that the hand and/or the finger lines, the patterns of the papillary ridges, or the pattern of the hypodermis are opticall

1. A method of identifying persons with the use of a light source (15), a polarization filter and a camera (10) with the help of their hand and/or finger lines, characterized in that the hand and/or the finger lines, the patterns of the papillary ridges, or the pattern of the hypodermis are optically detected without contact for the recording of an image by means of a first polarization filter (17) arranged in the path of the illuminating light rays, a second polarization filter (7) arranged in the path of the reproducing light rays, and a camera (10), with a rigid arrangement and with omission of any mechanical movements of the arrangement.