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Proceedings Paper

Signatures of live fingers extracted from a series of fingerprint images
Author(s): Ichiro Fujieda; Etsuji Matsuyama; Masashi Kurita
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Paper Abstract

Life recognition is desired for unattended fingerprint identification. We look at the color changes in a series of fingerprint images acquired during the course of an input action. As we press a finger upon an input device, a fingerprint area gradually increases and its color changes. This is due to the blood movements induced by a finger deformation. For example, we can declare a finger is alive if its color change exceeds a certain value. However, the color changes in the images acquired by a conventional device using a prism are very small. This is because the light reflected by the valley regions of a finger carries little information about the blood movements. We tried a fingerprint sensor based on scattered light detection. Here, a plastic plate serves as a light-guide for LEDs mounted on its edge. When a finger is pressed against the plate, the propagating light is scattered by the finger and leaks out of the plate. A standard color CCD camera placed near the plate captures the scattered light. Data extracted from more than ten people of different age groups indicate that there is a certain minimum value for the color changes.

Paper Details

Date Published: 7 March 2005
PDF: 9 pages
Proc. SPIE 5677, Sensors and Camera Systems for Scientific and Industrial Applications VI, (7 March 2005); doi: 10.1117/12.585411
Show Author Affiliations
Ichiro Fujieda, Ritsumeikan Univ. (Japan)
Etsuji Matsuyama, Ritsumeikan Univ. (Japan)
Masashi Kurita, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 5677:
Sensors and Camera Systems for Scientific and Industrial Applications VI
Morley M. Blouke, Editor(s)

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