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Proceedings Paper

Simple models for color changes in a finger during a fingerprint input action
Author(s): Atsushi Hori; Nobuyuki Takeoka; Ichiro Fujieda
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Paper Abstract

Blood movement inside a finger causes color changes in a fingerprint image during a fingerprint input action. We consider models to relate this information to the stiffness of a collective blood vessel in a finger. In the simple resistor model, finger area is regarded as voltage and the color change was regarded as current. We define its resistance as the ratio of these two quantities according to Ohm's law. However, experiments show that this resistance value increases as the force applied to a finger increases. Second, we consider the variable resistor model to account for this force dependency. We assume that the driving force decreases the cross-section of the blood vessel and that stress and strain are related by Young's modulus. Experiments by six participants show reasonably good fittings for the extracted signals and the model's predictions. The correlation coefficient between the extracted parameter and the average blood pressures of the participants was 0.75.

Paper Details

Date Published: 12 February 2008
PDF: 8 pages
Proc. SPIE 6849, Design and Quality for Biomedical Technologies, 68490P (12 February 2008); doi: 10.1117/12.762719
Show Author Affiliations
Atsushi Hori, Ritsumeikan Univ. (Japan)
Nobuyuki Takeoka, Ritsumeikan Univ. (Japan)
Ichiro Fujieda, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 6849:
Design and Quality for Biomedical Technologies
Ramesh Raghavachari; Rongguang Liang, Editor(s)

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