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.
M. Ferrara, A. Franco, D. Maltoni (2007). Estimating Image Focusing in Fingerprint Scanners. PISCATAWAY : IEEE [10.1109/AUTOID.2007.380588].
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
