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.
Titolo: | Estimating Image Focusing in Fingerprint Scanners |
Autore/i: | FERRARA, MATTEO; FRANCO, ANNALISA; MALTONI, DAVIDE |
Autore/i Unibo: | |
Anno: | 2007 |
Titolo del libro: | 2007 IEEE Workshop on Automatic Identification Advanced Technologies - Proceedings |
Pagina iniziale: | 30 |
Pagina finale: | 34 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1109/AUTOID.2007.380588 |
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. |
Data prodotto definitivo in UGOV: | 22-ott-2007 |
Data stato definitivo: | 22-mag-2017 |
Appare nelle tipologie: | 4.01 Contributo in Atti di convegno |