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| 14. |
- 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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| 15. |
- 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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| 16. |
- 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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| 17. |
- 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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| 18. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Impact of signature legibility and signature type in off-line signature verification
- 2007
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Ingår i: Biometrics Symposium, 2007. - Piscataway, N.J. : IEEE Press. - 9781424415496 ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- The performance of two popular approaches for off-line signature nature verification in terms of signature legibility and signature type is studied. We investigate experimentally if the knowledge of letters, syllables or name instances can help in the process of imitating a signature. Experimental results are given on a sub-corpus of the MCYT signature database for random and skilled forgeries. We use for our experiments two machine experts, one based on global image analysis and statistical distance measures, and the second based on local image analysis and Hidden Markov Models. Verification results are reported in terms of Equal Error Rate (EER), False Acceptance Rate (FAR) and False Rejection Rate (FRR). ©2007 IEEE.
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| 19. |
- Alonso-Fernandez, Fernando, et al.
(författare)
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Secure access system using signature verification over Tablet PC
- 2007
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Ingår i: IEEE Aerospace and Electronic Systems Magazine. - Piscataway, N.J. : IEEE Press. - 0885-8985 .- 1557-959X. ; 22:4, s. 3-8
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Tidskriftsartikel (refereegranskat)abstract
- Low-cost portable devices capable of capturing signature signals are being increasingly used. Additionally, the social and legal acceptance of the written signature for authentication purposes is opening a range of new applications. We describe a highly versatile and scalable prototype for Web-based secure access using signature verification. The proposed architecture can be easily extended to work with different kinds of sensors and large-scale databases. Several remarks are also given on security and privacy of network-based signature verification. © 2007 IEEE.
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| 20. |
- Andersson, Janicke, 1975-
(författare)
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Konsten att leva längre : Föreställningar om livets förändring i handböcker 1700-1930
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this thesis is to explore discursive changes in conceptions of life course and ageing. I am particularly concerned with the relationship between knowledge and power in the distribution of prolongevity and body- technologies, and as referential frame in the definition of normal and deviant bodies and behaviour. Following the historical processes this study includes advisory literature in the field of prolongevity from 1700-1930. As a conclusion I have distinguished four categories of legends in the material. In analyzing the legends: Antediluvian legends, Hyperborean legends, Fountain legends, and Centenarian legends. The legends of prolongevity intermediate ideas of human ageing in, and between cultures, On a meta-level there has been three discourses intertwining each other in the making of present images on prolongevity and successful ageing: Religion, Science and The Natural. In e discursive struggle during the studied years those components have been competing for domination and space on the prolongevity agenda. The advices reflect a belief in the possibility to transform by means of moderation and harmony; a belief that grew in the eighteenth century and enhanced during the following centuries. The aim was to improve human nature to an ennobled version of her self according to divine standards. Prolongevity was in 1700-1930 a question of reaching a pre-designated length of life given by God or Nature. Today we do not believe in pre-designated life-length we only believe in prolongation. We do want the paradise but we want it here on earth, and we want to be in charge.
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