This work is motivated by the need of simple and practical techniques to evaluate fingerprint scanners for non-AFIS applications. One of the characteristics that has to be considered for the evaluation of a fingerprint scanner is the capability of providing well focused images. It is common practice to indirectly estimate this characteristic by measuring the scanner Modulation Transfer Function (MTF). Unfortunately this requires a rather complex setup and specific expensive targets. In this paper a novel index (TSI) is proposed to simply evaluate finger image focusing. The method is based on the measurement of the steepness of the ridge/valley transitions of the fingerprint impressions. The experimental results confirm the strict relation between the proposed index and the ability of a scanner to clearly focus the fingerprint.

Estimating Image Focusing in Fingerprint Scanners

FERRARA, MATTEO;FRANCO, ANNALISA;MALTONI, DAVIDE
2007

Abstract

This work is motivated by the need of simple and practical techniques to evaluate fingerprint scanners for non-AFIS applications. One of the characteristics that has to be considered for the evaluation of a fingerprint scanner is the capability of providing well focused images. It is common practice to indirectly estimate this characteristic by measuring the scanner Modulation Transfer Function (MTF). Unfortunately this requires a rather complex setup and specific expensive targets. In this paper a novel index (TSI) is proposed to simply evaluate finger image focusing. The method is based on the measurement of the steepness of the ridge/valley transitions of the fingerprint impressions. The experimental results confirm the strict relation between the proposed index and the ability of a scanner to clearly focus the fingerprint.
2007 IEEE Workshop on Automatic Identification Advanced Technologies - Proceedings
30
34
M. Ferrara; A. Franco; D. Maltoni
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/49098
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