| 1. |
- Alonso-Fernandez, Fernando, 1978-, et al.
(författare)
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A Comparative Study of Fingerprint Image-Quality Estimation Methods
- 2007
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Ingår i: IEEE Transactions on Information Forensics and Security. - New York : IEEE Press. - 1556-6013 .- 1556-6021. ; 2:4, s. 734-743
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Tidskriftsartikel (refereegranskat)abstract
- One of the open issues in fingerprint verification is the lack of robustness against image-quality degradation. Poor-quality images result in spurious and missing features, thus degrading the performance of the overall system. Therefore, it is important for a fingerprint recognition system to estimate the quality and validity of the captured fingerprint images. In this work, we review existing approaches for fingerprint image-quality estimation, including the rationale behind the published measures and visual examples showing their behavior under different quality conditions. We have also tested a selection of fingerprint image-quality estimation algorithms. For the experiments, we employ the BioSec multimodal baseline corpus, which includes 19 200 fingerprint images from 200 individuals acquired in two sessions with three different sensors. The behavior of the selected quality measures is compared, showing high correlation between them in most cases. The effect of low-quality samples in the verification performance is also studied for a widely available minutiae-based fingerprint matching system.
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| 2. |
- Alonso-Fernandez, Fernando, 1978-, et al.
(författare)
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A Review Of Schemes For Fingerprint Image Quality Computation
- 2005
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Ingår i: COST Action 275. - Luxembourg : EU Publications Office (OPOCE). - 9789289800198 ; , s. 3-6
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Konferensbidrag (refereegranskat)abstract
- Fingerprint image quality affects heavily the performance of fingerprint recognition systems. This paper reviews existing approaches for fingerprint image quality computation. We also implement, test and compare a selection of them using the MCYT database including 9000 fingerprint images. Experimental results show that most of the algorithms behave similarly.
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| 3. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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An enhanced Gabor filter-based segmentation algorithm for fingerprint recognition systems
- 2005
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Konferensbidrag (refereegranskat)abstract
- An imponant step in fingerprint recognition is the segmentation of the region of interest. In this paper, we present an enhanced approach for fingerprint segmentation based on the response of eight oriented Gabor filters. The performance of the algorithm has been evaluated in terms of decision error trade-off curves of an overall verification system. Experimental results demonstrate the robustness of the proposed method.
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| 4. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Automatic Measures for Predicting Performance in Off-line Signature
- 2007
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Konferensbidrag (refereegranskat)abstract
- Performance in terms of accuracy is one of the most important goal of a biometric system. Hence, having a measure which is able to predict the performance with respect to a particular sample of interest is specially useful, and can be exploited in a number of ways. In this paper, we present two automatic measures for predicting the performance in off-line signature verification. Results obtained on a sub-corpus of the MCYT signature database confirms a relationship between the proposed measures and system error rates measured in terms of Equal Error Rate (EER), False Acceptance Rate (FAR) and False Rejection Rate (FRR). © 2007 IEEE.
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| 5. |
- Alonso-Fernandez, Fernando, 1978-, et al.
(författare)
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Combining multiple matchers for fingerprint verification : A case study in biosecure network of excellence
- 2007
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Ingår i: Annales des télécommunications. - Paris, France : Springer. - 0003-4347 .- 1958-9395. ; 62:1-2, s. 62-82
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Tidskriftsartikel (refereegranskat)abstract
- We report on experiments for the fingerprint modality conducted during the First BioSecure Residential Workshop. Two reference systems for fingerprint verification have been tested together with two additional non-reference systems. These systems follow different approaches of fingerprint processing and are discussed in detail. Fusion experiments involving different combinations of the available systems are presented. The experimental results show that the best recognition strategy involves both minutiae-based and correlation-based measurements. Regarding the fusion experiments, the best relative improvement is obtained when fusing systems that are based on heterogeneous strategies for feature extraction and/or matching. The best combinations of two/three/four systems always include the best individual systems whereas the best verification performance is obtained when combining all the available systems.
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| 6. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Comparison of fingerprint quality measures using an optical and a capacitive sensor
- 2007
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Ingår i: Biometrics: Theory, Applications, and Systems, 2007. BTAS 2007. First IEEE International Conference on. - Piscataway, N.J. : IEEE Press. - 9781424415977 - 9781424415960 ; , s. 133-138
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Konferensbidrag (refereegranskat)abstract
- Although several image quality measures have been proposed for fingerprints, no work has taken into account the differences among capture devices, and how these differences impact on the image quality. In this paper, several representative measures for assessing the quality fingerprint images are compared using an optical and a capacitive sensor. The capability to discriminate between images of different quality and its relationship with the verification performance is studied. We report differences depending on the sensor, and interesting relationships between sensor technology and features used for quality assessment are also pointed out. ©2007 IEEE.
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| 7. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Dealing With Sensor Interoperability in Multi-biometrics : The UPM Experience at the Biosecure Multimodal Evaluation 2007
- 2008
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Ingår i: Biometric Technology for Human Identification. - Bellingham, WA : SPIE - International Society for Optical Engineering. - 9780819471352 ; , s. J9440-J9440
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Konferensbidrag (refereegranskat)abstract
- Multimodal biometric systems allow to overcome some of the problems presented in unimodal systems, such as non-universality, lack of distinctiveness of the unimodal trait, noise in the acquired data, etc. Integration at the matching score level is the most common approach used due to the ease in combining the scores generated by different unimodal systems. Unfortunately, scores usually lie in application-dependent domains. In this work, we use linear logistic regression fusion, in which fused scores tend to be calibrated log-likelihood-ratios and thus, independent of the application. We use for our experiments the development set of scores of the DS2 Evaluation (Access Control Scenario) of the BioSecure Multimodal Evaluation Campaign, whose objective is to compare the performance of fusion algorithms when query biometric signals are originated from heterogeneous biometric devices. We compare a fusion scheme that uses linear logistic regression with a set of simple fusion rules. It is observed that the proposed fusion scheme outperforms all the simple fusion rules, with the additional advantage of the application-independent nature of the resulting fused scores.
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| 8. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Fingerprint Databases and Evaluation
- 2008. - 1
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Ingår i: Encyclopedia of Biometrics. - New York : Springer-Verlag New York. - 9780387730035 ; , s. 452-458
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 9. |
- Alonso-Fernandez, Fernando, 1978-, et al.
(författare)
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Fingerprint Recognition
- 2009
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Ingår i: Guide to Biometric Reference Systems and Performance Evaluation. - London : Springer London. - 9781848002913 - 9781848002920 ; , s. 51-88
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- First, an overview of the state of the art in fingerprint recognition is presented, including current issues and challenges. Fingerprint databases and evaluation campaigns, are also summarized. This is followed by the description of the BioSecure Benchmarking Framework for Fingerprints, using the NIST Fingerpint Image Software (NFIS2), the publicly available MCYT-100 database, and two evaluation protocols. Two research systems are compared within the proposed framework. The evaluated systems follow different approaches for fingerprint processing and are discussed in detail. Fusion experiments involving different combinations of the presented systems are also given. The NFIS2 software is also used to obtain the fingerprint scores for the multimodal experiments conducted within the BioSecure Multimodal Evaluation Campaign(BMEC’2007) reported in Chap.11.
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| 10. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Fusion of static image and dynamic information for signature verification
- 2009
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Ingår i: ICIP 2009. - Piscataway, N.J. : IEEE Press. - 9781424456543 ; , s. 2725-2728
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Konferensbidrag (refereegranskat)abstract
- This paper evaluates the combination of static image (off-line) and dynamic information (on-line) for signature verification. Two off-line and two on-line recognition approaches exploiting information at the global and local levels are used. Experimental results are given using the BiosecurID database (130 signers, 3,640 signatures). Fusion experiments are done using a trained fusion approach based on linear logistic regression. It is shown experimentally that the local systems outperform the global ones, both in the on-line and in the off-line case. We also observe a considerable improvement when combining the two on-line systems, which is not the case with the off-line systems. The best performance is obtained when fusing all the systems together, which is specially evident for skilled forgeries when enough training data is available. ©2009 IEEE.
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